Bidyanus bidyanus (Mitchell, 1838)
Silver perch
Bidyanus bidyanus
photo by Meyer, T.

Family:  Terapontidae (Grunters or tigerperches)
Max. size:  40 cm SL (male/unsexed); max.weight: 1,500.0 g
Environment:  benthopelagic; freshwater; depth range - 10 m, potamodromous
Distribution:  Oceania: known only from the Murray-Darling River system, Australia. Range boundaries: Chinchilla (on the Condamine River), South Queensland, Bonshaw (on the Dumaresq River), northeastern New South Wales, Albury (on the Murray River), southeastern New South Wales, Seven Creek and Goulburn River, South Victoria.
Biology:  Adults are found in rivers, lakes and reservoirs, preferring fast-flowing waters of rapids and races and usually forming aggregations near the surface. Usually found below rapids and weirs (Ref. 44894). Feed on aquatic insects, mollusks, earthworms and plants. Temp.: 2-37°C. Maturity: F, 3 y and 34 cm SL; M, 23.3 cm SL. Spawning: summer (Nov.-Jan., 23-30°C water temp.), effect upstream migration. Fecundity: 500000 eggs per 1.8kg. Eggs: pelagic, 2.7-2.8 mm diameter. Hatching: 30 hrs at 26-27°C. Larvae: 3.6 mm at hatching. A good angling and food fish which has been increasingly utilized as an aquaculture species in farm dams throughout Australia (Ref. 44894).
IUCN Red List Status: Near Threatened (NT); Date assessed: 13 February 2019 Ref. (126983)
Threat to humans:  harmless
Country info:  Roger Pullin, pers. comm.

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