Redigobius macrostoma (Günther 1861)

Distinguished by the following characteristics: compressed head and body; grey to pale brown body, mottled and chequered with dark brown dorsally; 8 oblique narrow dark brown to purplish brown bars along side; large black blotch on first dorsal fin; greatly enlarged mouth in mature males; first spine of dorsal fin always longest; second dorsal rays I,7-8; anal rays I,7; pectoral rays 15-18; lateral scales 25-29; TRB 9-12; predorsal scales 12-16, reaching close up behind eyes (Ref. 84480).

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).

Dorsal spines (total): 6 - 7; Dorsal soft rays (total): 7 - 8; Analspines: 1; Analsoft rays: 5 - 7

Found in estuaries, harbors and entering lower reaches of freshwater streams (Ref. 9002).