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Fish Archive (3069)
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Hoplisoma (formerly Corydoras) sp. CW49
Two beautiful new panda catfish (Hoplisoma) arrived from Colombia in 2010. As these species have not yet been scientifically studied, they have been assigned the code numbers CW49 and CW51. At first there was some confusion as to whether they were different species or just two color forms of the same species. Both have already […]
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Acipenser gueldenstaedtii
Sturgeons are fascinating, ancient fish that have lived on earth for around 200 million years. Unfortunately, almost all species are threatened with extinction in the wild; the main reason is – as always – habitat destruction. As sturgeons have a complex migratory behavior and most species live partly in the sea and partly in fresh […]
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Alestopetersius caudalis
The yellow Congo tetra (Alestopetersius caudalis) is a popular and frequently offered ornamental fish. The species originates from the Congo, where it is at home in the lower reaches of the African river. Wild-caught fish are very rare in the trade. The species was first imported around 1950 and was soon bred. The animals in […]
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Sarcocheilichthys parvus
The genus Sarcocheilichthys from China has the potential to become a new star in the ornamental fish sky. There is a complex of small (6-7 cm) species within the genus in southern China, which are characterized by a broad longitudinal band. The males of all three species develop very pretty vermilion fins at spawning time. […]
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Awaous flavus ( = A. strigatus)
The butterfly goby (Awaous flavus, formerly known aquaristically under the synonym A. strigatus) has a large distribution area along the Atlantic coast of South America. They are found in the lower reaches of rivers in Brazil, Guyana, Suriname, Venezuela, Colombia and on islands off the coast. Adults of this species, which is a maximum of […]
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Parodon sp. cf. pongoensis
The Parodontidae are a relatively small group of bottom-dwelling tetras. The family consists of three genera with a total of approx. 32 species. The genera are distinguished from each other by two characteristics: firstly, the number of unbranched rays in the pectoral fin: one each in Parodon and Apareiodon and two in Saccodon; and secondly, […]
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Macrobrachium spinipes
Macrobrachium rosenbergii is the largest and therefore frequently bred large-armed shrimp in aquaculture for food purposes. We have this impressive species more or less regularly in our program for specialists and show aquariums. For the biology and pictures of this species, see https://www.aquariumglaser.de/en/31-crayfishes-shrimps-crabs-snails-mussels/macrobrachium-rosenbergii-3/ M. spinipes is closely related to M. rosenbergii and has often been […]
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Inlecypris auropurpureus
Lake Inle in Burma has a high proportion of endemic fish species, i.e. those that are found exclusively there. One of these is Inlecypris auropurpureus, a Danio with vertical stripes on a golden band. The number and shape of the stripes are slightly different in each individual. Inlecypris is closely related to the malabar danio […]
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L66 is now Hypancistrus seideli
The scientific processing of loricariid catfishes with L-numbers is progressing. The confusing variety of forms that some species develop is a problem that is almost impossible to solve, even for ichthyologists, i.e. professional fish experts. In a recent study, a team of scientists looked at two Hypancistrus species from the Rio Xingu, namely L174, which […]
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Chanda nama
Until the 1950s, all aquaristically known species of glass perch were known under the genus name “Chanda”. The first major regrouping was carried out in 1955 by Fraser-Brunner, who revived the (old) genus Ambassis (with 20 species), placed the species nama in the monotypic genus Hamiltonia (i.e. only one species is assigned to it), established […]
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Chaca chaca GERMAN BRED
Frogmouth catfish (Chaca) are rarely kept in the aquarium and even more rarely bred. There are four species: Chaca chaca from India, C. burmensis from Burma, C. bankanensis from Malaysia and parts of Indonesia and C. serica from south of Borneo. The four species look very similar and were not distinguished from each other for […]
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Thorichthys affinis
“The unexpected often happens” says the well-known proverb. That’s what happened to us with Thorichthys affinis. Some time ago we received juveniles of – according to the breeder – Thorichthys meeki, the firemouth cichlid. The 3-4 cm long juveniles didn’t have much to offer in terms of color, but they were extremely harmonious in terms […]
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Nothobranchius ruudwildekampi
The genus Nothobranchius is a prime example of how aquarium keeping and science complement each other wonderfully. These killifish are typical seasonal fish; the genus is restricted to East Africa and offshore islands. In the wild, Nothobranchius only live for a few weeks. They produce eggs, which survive the drying out of the rainwater pools […]
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Apistogramma bitaeniata Blue wild
We have already reported on Apistogramma bitaeniata several times, please see hhttps://www.aquariumglaser.de/en/25-perchlike-fishes/apistogramma-bitaenata-brazil/ or https://www.aquariumglaser.de/en/fisharchive/apistogramma-bitaeniata-putumayo-4/. This species is without doubt one of the most beautiful dwarf cichlids around. We have recently received a locality variant from Brazil that differs in color from the specimens we normally obtain from there. In the light of the torch, we […]
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Limia islai
Lago Miragoane in Haiti is one of the largest natural freshwater lakes in the Caribbean, with a length of 12 km and an area of about 25 km2. In terms of its fish fauna, it is aquaristically exciting. Similar to the cichlids in the great African lakes, the livebearing toothcarps of the genus Limia have […]
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Lota lota
Do you know him? When a biologist comes to the fish facility, the fish keeper says: there are 50 of them and they’re all called Lothar! All jokes aside: Lota lota, the burbot or eelpout, is hardly ever seen alive as a juvenile fish, even by enthusiastic cold-water aquarists. It is one of the very […]
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Megalamphodus erythrostigmus = Hyphessobrycon erythrostigma
The regrouping of large fish families continues. After the barbs, armored catfish and cichlids, it’s now the turn of the characins. A major revision was published in September 2024, prompting us to retrain once again. Not all tetra species have been included yet, so it will certainly take a few years before the new name […]
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Viviparus viviparus
Among the freshwater snails native to Central Europe, three species play a special role due to their considerable size (4 cm and larger): the ramshorn snail, the great pond snail and the river snail. At least in the case of the latter – the river snail – the specific article “the” river snail is actually […]
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Hyphessobrycon pulchripinnis
The lemon tetra, Hyphessobrycon pulchripinnis, is one of the most popular aquarium fish of all and can be found in the standard range of pet shops all over the world. As with so many everyday species, little thought is given to them, but the lemon tetra holds many secrets! Its native habitat was unknown until […]
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Apistogramma psammophila
The two-banded dwarf cichlid, Apistogramma diplotaenia, is one of the dream fish of many Apistogramma lovers. The species originates from the Rio Negro drainage in Brazil. Unfortunately, this fish is also one of the most demanding species of the genus and even minor carelessness – e.g. a missed water change and the resulting increase in […]
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Cyprichromis leptosoma “Mpulungu”
Cyprichromis and Paracyprichromis are very special mouthbrooding cichlids from Lake Tanganyika. The animals sometimes live in huge shoals and feed on small animals that they pick out of the free water column. To attract the attention of the females, the males can be very brightly colored. They do not occupy actual territories. The females, on […]
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Carassius auratus – Goldfish Oranda Tricolor
The breeding of certain goldfish is one of the most demanding of all breeding activities – if it is done consciously. This is because characteristics such as coloration, finning, eye and skin changes in goldfish are usually not controlled by a single gene, but by several genes. This also affects the expression, i.e. larger or […]
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Hyphessonbrycon cf. pulchripinnis “Bolivia Orange”
The lemon tetra, Hyphessobrycon pulchripinnis, is one of the most popular aquarium fish of all and can be found in the standard range of pet shops. As with so many everyday species, little thought is given to them, but the lemon tetra holds many secrets! The ancestors of the animals that we can occasionally offer […]
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Xiphophorus hellerii, cave swordtail
Central America is famous for its numerous karst caves. A particularly interesting fauna has often developed in them. Perhaps the best-known cave fish in Mexico is the blind cave tetra (Astyanax jordani or Anoptichthys jordani, see https://www.aquariumglaser.de/en/fisharchive/blind-cave-tetras/). As with many cavefish, its eyes are severely atrophied. However, there are four underground lakes in the home […]
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Poecilocharax weitzmani
Of course, this fish is anything but a novelty and has been imported in relatively large numbers for many years. But isn’t it beautiful? This small animal is an ideal companion for the cardinal tetra (Paracheirodon axelrodi), with which it also occurs in the wild. Poecilocharax weitzmani grows to 3-4 cm and is relatively widespread […]
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Farlowella hahni
The needle catfish (Farlowella) are whimsical representatives of the loricariid catfishes (Loricariidae), reminiscent of sticks. They graze on fine growth with their typical sucking mouth. They are usually common animals in the wild, which is why they attracted the attention of scientists early on. The first species was described in 1853 (F. acus), the last […]
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Gobio gobio, gudgeon
The gudgeon, Gobio gobio, is one of the smallest native fish. It usually grows to 8-12 cm, rarely over 15 cm long. The record is said to be 21 cm, but such giants are as rare as people over 2.20 m long. Because of its small size and pretty colouring (compared to the mostly silvery […]
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Cyprinella lutrensis
There are numerous species (approx. 320) of minnow relatives in North America, but only very few species have become aquarium fish to date. In contrast to our native minnow, the Red Shiner (Cyprinella (formerly: Notropis) lutrensis) is a fairly undemanding fish and does not require such low temperatures. Although the species can be kept in […]
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Pelmatolapia mariae
In contrast to the larger Central American cichlids of the Cichlasoma relationship, the medium-sized African cichlids of the Tilapia relationship, which are ecologically quite similar to them, have never managed to become widespread in aquariums. The reasons for this lie in the geographical proximity of Africa to Europe. When aquarium keeping became widespread around 1900 […]
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Hydrophlox chrosomus ( = Notropis chrosomus)
The “rainbow shiner” (Hydrophlox chrosomus, formerly Notropis c.) was a sensational fish in the early 2000s. Strangely enough, only very few of the almost 325 species of North and Central American minnows and shiners have ever become established as aquarium fish. The fact that these animals are highly complex from a systematic-taxonomic point of view […]
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Neochela dadiburjori ( = Laubuka dadiburjori, = Chela dadiburjori)
This nano-fish jewel comes from the south of India (Kerala); the delightful dwarfs grow to a maximum length of 3 cm. They are absolutely peaceful schooling fish that prefer to spawn on the upper side of broad leaves, especially on Ludwigia species. However, they also show an amazing ability to adapt. About 50 years ago, […]
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Sturisomatichthys aureus
As is well known, the royal farlowellas (Sturisoma and Sturisomatichthys) were reclassified in 2019, resulting in some regrouping. Several species previously classified as Sturisoma now belong to the genus Sturisomatichthys. According to Londoño-Burbano & Reis, 2019, externally recognizable differences between the two genera are the irregular, numerous central ventral plates that are not arranged in […]
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Barbodes semifasciolatus ( = Barbus s.)
The Chinese barb (Barbodes semifasciolatus) was one of the first “exotic” ornamental fish to be kept in aquaria. Under the completely misleading name “Japanese bitterling”, they were introduced and bred as early as 1897 in the then still young aquarium hobby. In the first known article on the species (May 1897 in the “Blättern für […]
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Hypoclinemus mentalis
Flounders do not belong to the classic aquarium fish; most species live in the sea and become quite large. In the New World, there is the family Achiridae with 35 species in 9 genera, all of which are either euryhalin, i.e. can change freely between fresh and sea water, or live in pure fresh water. […]
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Platynematichthys notatus
Platynematichthys notatus is one of the extremely rare species on the ornamental fish market. There is only one species of the genus, but it is widely distributed in the Amazon and Orinoco river systems (Bolivia, Brazil, Ecuador, Colombia and Venezuela). This fish is usually only caught in the strong current, oxygen-rich areas of the main […]
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Sturisomatichthys ALBINO
As is well known, the royal farlowellas (Sturisoma and Sturisomatichthys) were reclassified in 2019, resulting in a number of regroupings. Several species previously classified as Sturisoma now belong to the genus Sturisomatichthys. According to Londoño-Burbano & Reis, 2019, externally recognizable differences between the two genera are the irregular, numerous central ventral plates that are not […]
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Chromobotia macracanthus ( = Botia macracantha) BRED
There are only two species in the global ornamental fish trade that have been traded in large numbers for decades collected from the wild: the Cardinal tetra (Paracheirodon axelrodi) and the Clown loach (Chromobotia macracanthus). Due to the great economic importance of these animals, the populations are monitored very closely and there are strict laws […]
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Trichogaster pectoralis
The snakeskin gourami (Trichogaster pectoralis) is the largest and most peaceful species of gourami. The animals can become 20-25 cm long and are therefore in their homeland Southeast Asia also estimated food fish. However, we prefer to enjoy their calm nature and beautiful coloration. For years there has been a dispute about the correct genus […]
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Mesonauta egregius
The flag cichlids (Mesonauta) are beautiful and peaceful, medium-sized cichlids that reach a length of 12-15 cm. In the wild they usually live together with angelfish (Pterophyllum), which they also resemble in terms of behavior and general requirements in the aquarium. As with the angelfish, the sexes are indistinguishable in younger animals. In older specimens, […]
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Sicyopus zosterophorus
The gobies (Gobiidae) are probably one of the most species-rich families of fish with over 2,000 species (currently accepted: around 1,500 species). Many gobies live in the sea, but gobies are often the most common fish in the freshwater of oceanic islands. In these cases, they are usually species that live as adult fish in […]
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Badis singenensis ( = sp. Buxar)
Badis singenensis ( = sp. Buxar) A beautiful, small chameleon fish (Badis) originates from the north of India, which has a reduced swim bladder as a special feature within the genus. As a result, it is very bottom-bound and moves around somewhat hopping. The maximum length of this species is approx. 4-5 cm including the […]
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Tetragonopterus denticulatus
The genus Tetragonopterus used to be the catch-all for all smaller tetra species, which are now found in the genera Hemigrammus, Hyphessobrycon or Moenkhausia, for example. The English term “tetra” for all tetras, an abbreviation of Tetragonopterus, has survived. Nowadays there are only 14 species of Tetragonopterus, of which only T. argenteus can be considered […]
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Wallaciia regani (formerly: Crenicichla regani) Tapajós
Cichlids are referred to as dwarf cichlids if their total length – including the caudal fin – does not exceed 10 cm. As many cichlids grow considerably larger and then also have corresponding space requirements in terms of housing, dwarf cichlids are particularly popular in the aquarium hobby. All pike cichlids of the genus Wallaciia […]
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Oxyropsis acutirostris
Unfortunately, the “Giant Otos” of the genus Oxyropsis are rarely offered for sale. Three species are currently scientifically accepted, O. carinata and O. wrightiana, which inhabit the upper and middle Amazon basin, and O. acutirostris from the upper Orinoco and Rio Negro basin. Oxyropsis can be distinguished from the similar species of the genus Hypoptopoma […]
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Kapuasia falaris
A new loach genus was only established in 2024, namely Kapuasia. The only species assigned to Kapuasia was K. maculiceps from the great Kapuas River on Borneo. Originally, K. maculiceps was assigned to the large collective genus Nemacheilus. As far as we know, K. maculiceps has not yet appeared aquaristically. Shortly after the genus Kapuasia […]
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Serrasalmus spilopleura
The correct naming of piranha species is one of the most difficult chapters in fish systematics. Even the scientists specializing in this group of fish are by no means in agreement. And so we often have little choice but to identify a newly imported piranha according to the few external characteristics that are generally recognized, […]
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Lepidosiren paradoxus 15-18 cm
We have already reported twice on the South American lungfish (Lepidosiren paradoxus), on juveniles here: https://www.aquariumglaser.de/en/02-living-fossils/lepidosiren-paradoxus-4/ and on the adult here: https://www.aquariumglaser.de/en/29-lungfishes/lepidosiren_paradoxus_en/; in both posts you will find further information. This species, which is widespread throughout South America, is a real rarity in the trade. We have just received some medium-sized specimens (8-10 cm and […]
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Indostomus crocodilus
According to current knowledge, the genus Indostomus comprises three species: I. paradoxus from Burma (see: https://www.aquariumglaser.de/en/20-sticklebacks/indostomus-paradoxus-4/) with largely colorless fins, I. crocodilus from southern Thailand and I. spinosus from the Mekong catchment in Thailand, Laos and Cambodia. The latter two species have distinct bands in the fins, especially in the dorsal fin. While I. crocodilus […]
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Dichotomyctere fluviatilis (formerly: Tetraodon fluviatilis)
The Green Puffers have been recently splitted from the catch-all genus Tetraodon and placed in a genus on their own, namely Dichotomyctere. Usually three diffenent species can be found in the trade: the Palembang or Figure-8-Puffer (D. ocellatus, formerly known as Tetraodon biocellatus), the Spotted Green Puffer (D. nigroviridis), and the Real Green Puffer (D. […]
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Brochis sp. C156 Rio Purus
The armored catfish of the Rio Purus in Brazil have an enormous variety of forms, which is really hard to see through. In addition to the already variable coloration, there are also differences in the color pattern at different ages. Almost every attempt at identification leaves doubts, at least for individual animals. It is therefore […]
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Leiarius marmoratus ( = L. longibarbis?)
There are two species of catfish in South America that look confusingly similar: Leiarius marmoratus, which the Indians call “Achara” and Leiarius (formerly: Perrunichthys) perruno. Both species grow to around 60 cm in length and have the same leopard pattern and long, ringed barbels. However, there is an easily recognizable difference: Leiarius marmoratus has 10-11 […]
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Brachygobius sp. Ocelot
Again we could import this new species of dwarf bumble-bee goby. This tiny fish becomes only 2 cm long. It cannot be applied to any described species so far. The fish have been collected in Indonesia. In Brachygobius, one very important feature for determination is the question wether the predorsal region is scaled or naked. […]
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Ompok pinnatus
Occasionally we receive a very unusual glass catfish from Thailand, whose incredibly long barbels immediately catch the eye. This is the species Ompok pinnatus, which was only described in 2003. These fish have little in common with the Ompok we usually import (see https://www.aquariumglaser.de/en/10-catfishes/10e-catfishes-from-asia/ompok_cf_fumidus_en/ and https://www.aquariumglaser.de/en/10-catfishes/10e-catfishes-from-asia/ompok_bimaculatus_and_o_pabda_en/), they look more like typical glass catfish (Kryptopterus), which […]
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Trichopsis vittata
The Croaking Gourami (Trichopsis vittata) is perhaps the most common small fish in South East Asia. It grows to 4 – 6.5 cm long. It can be found almost everywhere, except in strongly flowing waters and in the mountains. Freshly caught, the Croaking Gourami is usually very attractively coloured and shimmers in different shades of […]
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Lamprichthys tanganicanus
With a maximum length of 14 cm, the Tanganyika lampeye fish is the largest lampeye fish at all. It is found exclusively (= endemic) in Lake Tanganyika, where it lives in huge schools along rocky coasts. It is a breathtaking sight when such a shoal, comprising several thousand individuals, comes swimming around a cape like […]
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Boulengerella cuvieri
The elegant predatory tetras of the genus Boulengerella are divided into 5 species: B. cuvieri, B. lateristriga, B. lucius, B. maculata and B. xyrekes. They are widely distributed in the large river systems of the Amazon and Orinoco and the Guyanas. Distinguishing the species is not easy, especially with small juveniles. Juveniles of B. cuvieri […]
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Selenotoca multifasciata (S. papuensis)
There are two genera of argus fish or scats, Scatophagus and Selenotoca. Most authors currently only recognize two species in Scatophagus and one in Selenotoca, in Scatophagus the species S. argus and S. tetracanthus and in Selenotoca the species S. multifasciata. However, there are certainly considerably more species, and in Selenotoca there is probably at […]
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Osphronemus goramy
Most people only know giant gouramis (Osphronemus goramy) from the zoo. There, these somewhat overgrown-looking animals (but that’s the way it should be) – the largest labyrinth fish of all – usually swim peacefully in the company of other large fish from Southeast Asia. However, the juvenile fish not only look completely different, but also […]
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Cherax quadricarinatus
Among the numerous Cherax species Cherax quadricarinatus, also known as Australian red claw crayfish, occupies a special position. It has been propagated as edible crayfish in aquaculture for decades and was therefore one of the very first Cherax species available for aquaristics. Cherax quadricarinatus belongs to the largest representatives of its genus, males can reach […]
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Brochis robineae
Brochis robineae (formerly: Corydoras robineae) stands out from the large number of armored catfish species that exist due to its unique tail fin pattern. Only in B. robineae is the caudal fin horizontally striped (in all other species it is colorless or vertically striped). Such a striking caudal fin pattern is also rarely found in […]
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Spatuloricaria terracanticum ( = S. sp. COLOMBIA)
The genus Spatuloricaria consists of 13 scientifically described species. The genus has an extremely wide distribution area from the south of South America (Argentina, Paraguay, Uruguay, southern Brazil) to Panama in the north. It is also found on both slopes of the Andes. 11 of the 13 species were described by 1945, with two new […]
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Pterophyllum Angelfish Red Head Marble
In the majority of cases, the aim of breeding forms is to develop a type that is as uniformly colored and physically developed as possible. In other words: ideally, all animals of a particular breeding line should look the same. This is not the case with the marbled angel and the red-headed marbled angel developed […]
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Hyphessobrycon columbianus
Hyphessobrycon columbianus was described by Zarske & Géry in 2001. According to Weitzman, the fish belongs to the “Rosy Tetra group” (in the broadest sense “ornamental tetra relatives”). The first specimens arrived in Germany in 1995, caught in a tributary of the Rio Acanti, Colombia. All specimens currently on the market are said to be […]
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Herotilapia multispinosa
This medium-sized cichlid – males can grow to a maximum length of 12 cm, females always remain 3-5 cm smaller – originally comes from Central America (Nicaragua, Costa Rica, Honduras). It is a real classic among aquarium fish and was at its peak popularity in the 1970s. Although the name “rainbow cichlid” given to them […]
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Corydoras serratus
The saddle-snouted Corydoras serratus from the upper Rio Negro region in Brazil is one of the most sought-after armored catfish. Because the saddle-snouted Corydoras, in contrast to the long-snouted and round-snouted former (now assigned to other genera) Corydoras, tend to be solitary fish, they cannot be caught economically in large numbers. This and the fact […]
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Stiphodon annieae
Neon gobies of the genus Stiphodon are really wonderful aquarium fish. They have an interesting behavior, remain small, are not particularly demanding and the males are often beautifully colored. From an aquarium point of view, they have only one disadvantage: as the larvae develop exclusively in the sea, raising them presents the same difficulties as […]
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Macropodus erythropterus
The paradise fish (Macropodus) can be roughly divided into three groups: the black paradise fish with the described species M. hongkongensis, M. erythropterus, M. lineatus, M. minnanensis, M. oligolepis, M. phongnhaensis, M. spechti, M. tramiensis and M. yeni, the blue-red paradise fish with the described species M. baviensis, M. chinensis, M. filamentosus, M. opercularis and […]
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Erythrinus sp. Orinoco
The predatory tetras of the genus Erythrinus should be easy to identify, because from a scientific point of view only two species are accepted: E. erythrinus, which inhabits virtually the entire tropics and parts of the subtropics of South and Central America, and E. kessleri, an endemic (i.e., occurs only there) from the state of […]
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Hoplisoma cf. axelrodi CW169
A whole range of armored catfish species are exported from Colombia under the fantasy name “Corydoras deckeri”. They all originate from the large Rio Meta system, but more precise information is rarely available. One of the most frequently offered “deckeri” species is Hoplisoma axelrodi. This beautiful armored catfish has been very popular for decades and […]
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Platy Wagtail Pointed Tail
The “pointed tail” mutation, in which the middle caudal fin rays are elongated, appeared relatively late: the first specimens appeared on the market in the 1980s. It originated in the Southeast Asian large-scale breederies. The characteristic, which first appeared in the Platy (Xiphophorus maculatus), can also be transferred to other Xiphos, but the pointed tail […]
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Hemigrammus filamentosus
In 2010, we were able to import a new tetra from Brazil via Belem for the first time, which could not be clearly assigned to any scientifically described species. It was provisionally named Hyphessobrycon cf. stegemanni and Phoenix tetra. Today we know that the species originates from the Rio Araguaia. The maximum length is 3-4 […]
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Tenellus trimaculatus
From Peru we receive this nice catfish, which can be recognized by its species-typical pattern: A black spot at the base of the dorsal fin, two at the middle base of the caudal fin. The species name also refers to this (trimaculatus = with three spots). The peaceful animal becomes about 10 cm long. Its […]
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Astronotus mikoljii
Of the seven scientifically described species of Astronotus, only two are currently recognized by most ichthyologists, namely A. crassipinnis and A. ocellatus; however, a third, A. zebra, is so distinctly different in color from the others that there is little doubt as to its validity. Now a new name has been established: the Oscar from […]
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Serrasalmus gibbus
The piranha species Serrasalmus gibbus comes from the catchment of the Rio Tocantins, it was described from the Rio Araguaia. The animals that we currently have in stock were delivered with the location Guama. The Rio Guama is a 160 km long tributary of the Tocantins in the state of Pará, Brazil. The species is […]
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Xiphophorus maculatus Platy Sunset Comet
The breeding forms of Xiphophorus species – almost exclusively the species X. hellerii, X. variatus and X. maculatus are involved – are a never-ending story. What is confusing are the very inconsistent names. In X. maculatus it has actually proved useful to include the caudal root and caudal fin pattern in the name, if it […]
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Apistogramma salpinction
In the 1980s, anyone interested in the dwarf cichlids of the genus Apistogramma did not need to know more than 10 species. Today (2025), this genus is the most species-rich cichlid genus of all, with 94 accepted species plus numerous species that have not yet been scientifically recorded. The majority of the newly discovered species […]
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Astronotus rubroocellatus Rio Negro
The scientific assessment of the various species within the genus Astronotus varies greatly, with most scientists only accepting three species, namely A. crassipinnis, A. ocellatus and A. mikoljii, which was only described in 2022. Others believe that there are many more species and that the genus urgently needs a scientific revision. The species compressus (Peru, […]
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Hyalobagrus flavus
Back in 1903 Georg Duncker from the Hamburg Museum described a small species of catfish from the Malay Peninsula under the name of Pseudobagrus ornatus. The description appeared in the same famous paper in which the harlequin barb (Trigonostigma heteromorpha) and the dwarf rasbora (Boraras maculatus) were described. In contrast to the two barbs, which […]
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Myloplus sauron (formerly Myleus schomburgkii)
The title of this post is perhaps a little misleading; it is intended to indicate that the species recently scientifically described as Myloplus sauron has been known in the hobby as Myleus schomburgkii for around 100 years. However, M. schomburgkii still exists. Back in 2004, the genus Myloplus was separated from Myleus and M. schomburgkii […]
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Marisa cornuarietis
Marisa cornuarietis, originally from Colombia, is one of the largest freshwater snails kept in the aquarium. Its disk-shaped shell can reach over 5 cm in diameter. This is why the species has been continuously kept in aquariums since the 1930s, although it is only suitable for special aquariums without plants. Sooner or later every aquatic […]
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Syncrossus helodes (formerly: Botia helodes)
The tiger loaches (Syncrossus) were previously assigned to the genus Botia. There are currently 6 recognized species of these magnificent loaches, which are distinguished by their special pointed heads, but their identification is often uncertain and questionable, as species distinctions are usually based solely on colour characteristics. Unfortunately, these color characteristics are not always constant […]
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Steatocranus casuarius
The humphead cichlids (Steatocranus) are among the most interesting cichlids in Africa. In adaptation to their way of life in nature – they colonize boulder bottoms in the area of rapids – they have reduced their swim bladder and cannot float freely in the water without making swimming movements with their fins. There are eight […]
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Steatocranus casuarius Gold
Yellow or gold coloration is generally widespread in fish and, although the animals affected by the corresponding mutation are very conspicuous and can therefore be easily preyed upon by predators, they also occur from time to time in nature. The goldfish is such a xanthorist (xanthorism is the technical term for this mutation). Among cichlids, […]
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Agamyxis pectinifrons
If you are looking for a long-lived, extremely robust, pretty and peaceful fish, Agamyxis is the right fish for you. Although these virtually indestructible spiny catfish grow relatively large at up to 15 cm in total length, they are absolutely peaceful and require so little movement due to their well-kept phlegm that they can live […]
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Neovespicula depressifrons
The order of scorpionfishes is as well famous as famed. Without scorpionfishes a real bouillabaisse is unthinkable, without lionfishes public aquaria and marine hobbyists would miss a wonderful attraction, but all members of this order have venomous spines and can inflict very painful – in case of the stonefishes even eventually deadly – stings. Scorpionfishes […]
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Ancistrus sp. L519 Bolivia
During the private fish expedition “SiluCha 2018”, this Ancistrus, which is ideal for aquariums, was discovered in the drainage of the Rio Iténez. The collectors managed to bring back a few specimens and breed them. In the meantime, this beautifully marked species has even reached the trade, and because there are currently no professional ornamental […]
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Polypterus ornatipinnis
Polypterus ornatipinnis is the most beautifully colored bichir. This species is native to the Congo and grows to over 60 cm in length. Nowadays, however, almost exclusively offspring from Indonesia are on the market. Despite the impressive size that Polypterus ornatipinnis can theoretically reach, this species was the first that could be bred by hobby […]
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Nomorhamphus liemi
This beautifully colored halfbeak comes from the island of Sulawesi (= Celebes), where it is found in the south of the island, in the highlands of Maros. In contrast to the closely related genus Dermogenys, the upper and lower jaws are approximately the same length, hence the genus name. For some species, however, it is […]
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Hyphessobrycon saizi (“Hyphessobrycon eos”) Colombian gold tetra
The most common “gold tetra” in the trade comes from Colombia and is generally traded under a false name. It can be found in the trade up and down the country for little money under the name Hyphessobrycon eos (sometimes also as Hemigrammus eos). The species Hyphessobrycon eos actually exists, but it is not kept […]
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Chilatherina alleni
The rainbowfish of the genus Chilatherina are found exclusively in New Guinea. The genus differs from the closely related genus Melanotaenia mainly in its jaw structure. To date, 11 species have been assigned to Chilatherina. One of the peculiarities of some species of this genus is that they change color strongly at an advanced age. […]
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Mugilogobius rexi
This small goby is a free swimming species, in contrast to most of the other gobies. Maximum length is about 4-5 cm. Territorial males become bright yellow and also develope larger fins with dark bands. Females are much paler in coloration and have translucent fins. The species is restrictet to Sulawesi and even on that […]
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Uaru amphiacanthoides
The triangle cichlids (Uaru) are a small genus of cichlids in terms of the number of species, with only two scientifically accepted species: U. amphiacanthoides from the Amazon basin and upper Orinoco (Brazil and Colombia) and U. fernandezyepezi from the Rio Atabapo (Venezuela). Both species reach a total length of 20-30 cm and are therefore […]
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Geophagus pyrocephalus ( = Tapajós Red Head)
Since the end of the 1980s, a beautifully colored Geophagus from the closer relationship of G. altifrons and G. surinamensis has been known, which differs from almost all other Geophagus species by an orange or red forehead. This characteristic affects both sexes from the onset of sexual maturity, which is the case at around 8-10 […]
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Moringua raitaborua
We were able to import something quite special for lovers of unusual fish from India: Moringua raitaborua. This “spaghetti eel” grows to a length of 30-40 cm and is only as thick as a pencil. In fact, the representatives of the genus Moringua are not eels of the Anguillidae family, but form a family of […]
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Tatia intermedia
The closer relatives of Tatia are quite well known aquaristically, as several species have proven to be easy to keep and breed. The attractive coloration of some species makes up for the fact that these animals are rarely seen during the day. They only leave their hiding places at feeding times. The following applies to […]
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Microrasbora rubescens
This dwarf rasbora – it only reaches a total length of 2-3 cm – is right in line with the current trend. There have always been fashions in aquaristics, just like in any other hobby. Sometimes it’s the characins, then it’s the Malawi cichlids or the discus, the L-catfish or the West African dwarf cichlids. […]
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Lentipes ikeae
The goby subfamily Sicydiinae currently comprises nine genera with 121 species. They are all current-loving animals that occur in nature mainly in clear streams and feed on growth and small animals. Larval development takes place in the sea. Some neon gobies of the genus Stiphodon are particularly popular, representatives of other genera are rarely found […]
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Leporacanthicus sp. L241
Why do so many L-catfish have a light-colored dot pattern on a black background? From the 3-5 cm long Parotocinclus haroldoi (https://www.aquariumglaser.de/en/fisharchive/parotocinclus-haroldoi-4/) to the sometimes meter-long Acanthicus adonis (https://www.aquariumglaser.de/en/10-catfishes/acanthicus-adonis-2/) the coloration occurs; in between there are tens of species with such coloration, which are in between in size. In the entire realm of other catfish, […]
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Enteromius fasciolatus ( = Barbus fasciolatus, Barbus barilioides)
Only very few of the numerous small barb species in Africa have been able to establish themselves permanently as aquarium fish and only one species is bred so regularly that it is more frequently found in the pet trade. This species is the beautiful Angola barb, Enteromius fasciolatus. A well-known synonym of the species is […]
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