Diagnostic Description
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Large head. Fusiform body. Large and terminal mouth. Two dorsal fins. First with 6 spines, second with 1 spine and 10 to 11 branched rays. Adults body and fins usually grey to black with a clearer belly. Juveniles brown with a serie of darker rounded marks along the flanks. First dorsal usually shows a black mark in its posterior part, especially for young specimens. Fading while fish age. 10 to 25cm (Ref. 57749).
Migration
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Amphidromous. Refers to fishes that regularly migrate between freshwater and the sea (in both directions), but not for the purpose of breeding, as in anadromous and catadromous species. Sub-division of diadromous. Migrations should be cyclical and predictable and cover more than 100 km.Characteristic elements in amphidromy are: reproduction in fresh water, passage to sea by newly hatched larvae, a period of feeding and growing at sea usually a few months long, return to fresh water of well-grown juveniles, a further period of feeding and growing in fresh water, followed by reproduction there (Ref. 82692).
Morphology
provided by Fishbase
Dorsal spines (total): 7; Dorsal soft rays (total): 10 - 11; Analspines: 1; Analsoft rays: 9 - 10
Biology
provided by Fishbase
This species occurs in freshwaters and sometimes brackish waters in slow to fast current waters to the base of the first falls. Usually occurs in clear waters with sand, gravel or rock bottom. Feeds on algae, detritus, worms, gastropods and crustaceans. Close biology to A. guamensis. Amphidromous species. Adults migrate to the mouth of the rivers for reproduction. Females spawn on the rocks' surface where the males fecund the eggs. Males protect the eggs until they hatch (incubation lasts 24 to 70hrs). Larvae, translucid, are then carried into estuaries or sea. They come back after they spent 150 to 165 days in seawaters (Ref. 57749). Also Ref. 4343.
Awaous commersoni
provided by wikipedia EN
Awaous commersoni, or Commerson's freshwater goby, is a species of goby found on islands in the Southwest Indian Ocean.[1]
Size
This species reaches a length of 25.0 cm (9.8 in).[2]
Etymology
The fish is named in honor of French naturalist Philibert Commerçon (also spelled Commerson, 1727–1773), it is a replacement name for Gobius niger Lacepède 1800 it was based on Commerçon's manuscript description, “Gobius totus niger …”), preoccupied by G. niger Linnaeus 1758 (Gobiidae). [3]
References
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^ Keith, P., G. Marquet, P. Valade, P. Bosc and E. Vigneux, 2006. Atlas des poissons et des crustacés d'eau douce des Comores, Mascareignes et Seychelles. Muséum national d’Histoire naturelle, Paris. Patrimoines naturels, 65:250p.
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^ Froese, Rainer; Pauly, Daniel (eds.) (2015). "Awaous commersoni" in FishBase. February 2015 version.
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^ Christopher Scharpf & Kenneth J. Lazara (22 September 2018). "Order GOBIIFORMES: Family GOBIIDAE (d-h)". The ETYFish Project Fish Name Etymology Database. Christopher Scharpf and Kenneth J. Lazara. Retrieved 12 March 2023.
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Awaous commersoni: Brief Summary
provided by wikipedia EN
Awaous commersoni, or Commerson's freshwater goby, is a species of goby found on islands in the Southwest Indian Ocean.
- license
- cc-by-sa-3.0
- copyright
- Wikipedia authors and editors