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Aplodinotus grunniens

(Freshwater Dogfish)

Overview

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L-shaped otoliths are collected as 'lucky stones'[1].

Common Names

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Click on the language to view common names.

Common Names in Danish:

Flodtrommefisk

Common Names in English:

Freshwater Dogfish, Freshwater Drum, Sheephead, Sheepshead

Common Names in French:

Malachigan

Common Names in German:

Süßwasser-Trommelfisch, Süßwasser-Trommelfisch

Common Names in Mandarin Chinese:

淡水石首魚, 淡水石首魚, 淡水石首鱼

Common Names in Russian:

барабанщик речной, барабанщик речной

Common Names in Spanish:

Roncador Curruco, Roncador De Agau Dulce, Roncador De Agua Dulce

Common Names in Swedish:

Flodtrumfisk

Description

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Family Sciaenidae

Drums or croakers are distributed in the Atlantic, Indian and Pacific oceans. Dorsal fin long, having a deep notch between the spinous and soft-rayed parts, but the parts rarely separate. Spinous part with 6-13 spines; the soft-rayed part with 1 spine and usually 20-35 soft rays . Anal fin having 1 or 2 usually weak spines; soft rays 6-13. Lateral line reaching end of caudal fin. Slightly emarginate to rounded caudal fin. Opercle with the upper bony edge forked . Gill opening with a bony flap above it. Some species with 1 barbel or a patch of small barbels on chin. Large cavernous canals in head . Snout and lower jaw with conspicuous pores . Vomer and palatine toothless. Swim bladder usually having many branches and used as a resonating chamber. Exceptionally large otoliths. Vertebrae 24-29. Bottom dwelling carnivores , feeding on benthic invertebrates and small fishes . Juveniles are popular aquarium fishes, but difficult to maintain.The family Sciaenidae belongs to the Class Actinopterygii (ray-finned fishes) and the Order Perciformes. It contains 70 genera and 270 species. It may be found in Marine , Brackish , and Freshwater environments and is primarily Marine. Some members of this family are used in the aquarium trade. Reproductively, most members of this family are nonguarders. The main mode of swimming of adult fish in this family is labriform . Compared with other fish, the activity level of this family tends to be normal. Members of this family have been dated back to the Miocene epoch of the Tertiary period. This family may be found from 60° n to 40° s and 125° w to 154° e. Etymology of this family name : Greek, skiaina = a kind of fish

Physical Description

Species Aplodinotus grunniens

Body: Mouth and snout: Terminal and horizontal mouth, located ventrally on the head , with small teeth on the jaws . No barbels . Body patterning, color, and scales : Solid color of silver, light gray, or light olive with a cream or white belly. Pelvic fins whitish, remaining fins lightly pigmented to dusky . 48-53 ctenoid lateral scales. Body shape and size: Body laterally compressed and deep; oval in cross section . Typically 350-500 mm (14-20 in) TL ; maximum about 950 mm (38 in).

Fins: Tail, dorsal and other fins: Rounded or square tail (but see Juveniles ). Dorsal fin with 2 distinct lobes , slightly attached by a membrane the first with 8-9 spines and the second with 1 spine and 24-32 rays. Pelvic fins thoracic ; first ray elongated into filament . Adipose fin absent. Anal fin with 2 spines and 7 rays.

Distinguishing characteristics: The freshwater drum can be distinguished by its rounded/square/triangular tail, its steep head profile, and its pelvic fins with the first ray elongated into a filament. See also similar species information.

Breeding adults : Similar to non-breeders.

Juveniles: Similar to adults, but tail more triangular (pointed ) in shape.

Size/Age/Growth

Males are commonly 45 cm (Total Length) in length when caught/marketed, but may be as large as 95 cm (Total Length).

Habitat

Occurs in bottoms of medium to large rivers and lakes .

Biome: Fresh water . Demersal .

Biology

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Diet

Feeds on mollusks, benthic crustaceans, and insects.

Known to produce sound .

Taxonomy

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Unambiguous Synonyms

  1. Aplidonotus grunniens Rafinesque, 1819
  2. Corvina richardsoni Cuvier, 1830
  3. Corvina richardsonii Cuvier, 1830
  4. Sciaena grisea Lesueur, 1821
  5. Sciaena oscula Lesueur, 1821

Notes

Name Status: Accepted Name . Synonym: Sciaena grisea. Latest taxonomic scrutiny: July 07, 2000.

Family : Drums or croakers .

Similar Species

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Fish Name Tail Shape Head Profile Pelvic Fins Similarity Index Freshwater Drum Rounded/square/triangular Steep 1st ray elongated into a filament N/A White Perch Forked Rounded No filament Moderately similar

Members of the genus Aplodinotus

ZipcodeZoo has pages for 3 species and subspecies in this genus:

A. gruniens · A. grunniens (Freshwater Dogfish) · A. grunnieus

More Info

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Further Reading

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Notes

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Contributors

Data Sources

Accessed through GBIF Data Portal March 01, 2008:

Identifiers

Footnotes

  1. Wheeler, A. (1977). Das grosse Buch der Fische. Eugen Ulmer GmbH & Co. Stuttgart. 356 p. [back]
Last Revised: 7/2/2009