River catfish
River catfish | ||||||||||||
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Acrochordonichthys rugosus , drawing from the first description by Pieter Bleeker . |
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Systematics | ||||||||||||
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Scientific name | ||||||||||||
Akysidae | ||||||||||||
Gill , 1861 |
The river catfish (Akysidae) are a fish family from the order of the catfish-like (Siluriformes). They occur in the fast-flowing waters of Southeast Asia in Myanmar , Thailand and Malaysia as well as Java , Sumatra and Borneo .
features
River catfish are small fish, usually two to five, maximum about 15 centimeters in length. They are usually well camouflaged and live hidden. The head, body and fins are covered by small nodules similar to those of the mountain catfish (Sisoridae). Rows of enlarged nodules run along the body. The skin is regularly stripped and renewed. The head has a pair of small eyes and four pairs of barbels . The dorsal fin has a short base and a strongly developed hard ray, and usually four or five soft rays. An adipose fin is usually present. The pectoral fins have a strong, mostly serrated hard ray. The swim bladder is somewhat reduced.
Systematics
The river catfish are assigned to the superfamily Sisoroidea, which, according to molecular biological investigations, is placed in the “Big Asica” group.
Within the family, a distinction is made between two subfamilies with a total of four or five genera and about 30 species :
- Subfamily Akysinae : The enlarged skin nodules are arranged in a row along the middle of the body and usually four other rows and have horny appendages. The dorsal fin usually has five soft rays. The adipose fin is medium in size and the hard ray of the pectoral fins has a notch on the front and is notched on the back. The gill opening is relatively narrow. The subfamily includes one or two genera; the Pseudobagarius species are placed in the genus Akysis by some authors :
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Akysis
- Akysis brachybarbatus
- Akysis clavulus
- Akysis clinatus
- Akysis ephippifer
- Akysis fontaneus
- Akysis fuliginatus
- Akysis galeatus
- Akysis hendricksoni
- Akysis heterurus
- Akysis longifilis
- Akysis maculipinnis
- Akysis manipurensis
- Akysis microps
- Akysis pictus
- Akysis portellus
- Akysis prashadi
- Akysis pulvinatus
- Akysis recavus
- Akysis scorteus
- Akysis subtilis
- Akysis variegatus
- Akysis varius
- Akysis vespa
- Akysis Vespertinus
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Pseudobagarius
- Pseudobagarius alfredi
- Pseudobagarius baramensis
- Pseudobagarius filifer
- Pseudobagarius fuscus
- Pseudobagarius hardmani
- Pseudobagarius inermis
- Pseudobagarius leucorhynchus
- Pseudobagarius macronemus
- Pseudobagarius meridionalis
- Pseudobagarius nitidus
- Pseudobagarius pseudobagarius
- Pseudobagarius similis
- Pseudobagarius sinensis
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Akysis
- Subfamily Parakysinae : The skin nodules are rounded and arranged in rows ( Acrochordonichthys and Breitensteinia ) or evenly distributed ( Parakysis ). The dorsal fin has four soft rays. The adipose fin is either long ( Parakysis ) or absent ( Acrochordonichthys and Breitensteinia ). The eyes are tiny. The barbels on the lower jaw often have a short secondary barbels. The gill trap has no thorns. Lateral line pores are absent. The subfamily was previously partially run as a separate family Parakysidae.
swell
- Joseph S. Nelson : Fishes of the world . 4th edition. John Wiley & Sons, Hoboken 2006, ISBN 978-0-471-25031-9 , pp. 171-172 .
- Tim M. Berra: Freshwater Fish Distribution . The University of Chicago Press, Chicago 2007, ISBN 978-0-226-04442-2 , pp. 207-208 .
Individual evidence
- ^ Joseph S. Nelson: Fishes of the world . 4th edition. John Wiley & Sons, Hoboken 2006, ISBN 978-0-471-25031-9 , pp. 164 .
- ↑ JP Sullivan, Lundberg JG; Hardman M: A phylogenetic analysis of the major groups of catfishes (Teleostei: Siluriformes) using rag1 and rag2 nuclear gene sequences . In: Mol Phylogenet Evol. . 41, No. 3, 2006, pp. 636-62. doi : 10.1016 / j.ympev.2006.05.044 .
- ↑ River catfish on Fishbase.org (English)
Web links
- River catfish on Fishbase.org (English)