Gadopsis bispinosus Sanger, 1984
Twospine blackfish

Family:  Percichthyidae (Temperate perches)
Max. size:  32 cm SL (male/unsexed)
Environment:  demersal; freshwater
Distribution:  Oceania: endemic to Australia.
Diagnosis:  Dorsal spines (total): 1-3; Dorsal soft rays (total): 35-38; Anal spines: 3-3; Anal soft rays: 17-20; Vertebrae: 46-49. Adults are brown to blackish along the sides, with variable mottled or blotched patterns bordered by yellow, and whitish ventrally (Ref. 33616).
Biology:  Occur in cool, clear streams with rocky bottoms in mountain terrain (Ref. 33616); with fast to moderate flow (Ref. 44894). Often abundant at altitudes of 200-700 m (Ref. 33616). Benthic, nocturnally active species which usually occur solitary. Juveniles often found in large groups among leaf litter and wood debris. Movements are restricted to a relatively small stretch of river over the duration of the life span. Occur with G. marmoratus at lower elevations, but they have different habitat preferences. Feed on insect larvae, fishes, fish eggs, earthworms and crustaceans. Breed between October and December. Sexual maturity is attained after 2 years (Ref. 44894). Often caught by recreational fishers targeting trout, although not a desirable target due to its small size (Ref. 33616).
IUCN Red List Status: Near Threatened (NT); Date assessed: 14 February 2019 (B2b(ii,iii)) Ref. (130435)
Threat to humans:  harmless


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