Bidyanus bidyanus (Mitchell, 1838)
Silver perch
Bidyanus bidyanus
photo by Yau, B.

 Family:  Terapontidae (Grunters or tigerperches)
 Max. size:  40 cm SL (male/unsexed); max.weight: 1,500.0 g
 Environment:  benthopelagic; 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.
 Diagnosis:   
 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: Vulnerable (A1cd) (Ref. 96402)
 Threat to humans:  harmless
 Country info:  Roger Pullin, pers. comm.

 Entered by: Agustin, Liza Q. - 11.08.94
 Modified by: Froese, Rainer - 24.02.13
 Checked by: Palomares, Maria Lourdes D. - 11.08.94

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