Sperm goby (Ctenogobius thoropsis), first described by Pezold & Gilbert, 1987 is a tiny fish in the family Gobiidae (order Gobiiformes). Adults typically reach 4.40 cm in maximum length. It is diadromous, migrating between freshwater and marine environments during its life cycle. Recorded depth range: 20 to 40 metres. It occurs in Tropical waters. It feeds on a mix of small fish and invertebrates as a mid-level predator. On the IUCN Red List, it is classified as Least Concern.
Dorsal spines (total): 7; Dorsal soft rays (total): 11; Anal spines: 1; Anal soft rays: 12. Eyes reduced, size do not fill the socket. Both sexes with jaw extending to the rear margin of the orbit. Pectoral fin count high (usually 18, 17-19). Tail elongated .: fusiform / normal.
Behavioural data for Sperm goby is currently being reviewed.
Marine; freshwater; brackish; demersal; amphidromous ; depth range 20 - 40 m . Tropical South America: Surinam and lower Rio Amazonas.
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