Country Species Summary

Bidyanus bidyanus in Australia
Bidyan perch

Bidyanus bidyanus (Mitchell, 1838)
Family:	Terapontidae (Grunters or tigerperches)	picture (Bibid_u0.jpg) by Yau, B.
Order:	Perciformes (perch-likes)
Class:	Actinopterygii (ray-finned fishes)
FishBase name:	Bidyan perch
Max. size:	40.0 cm SL (male/unsexed; Ref. 2906); max. published weight: 1,500 g (Ref. 5259)
Environment:	benthopelagic; potamodromous ; depth range - 10 m
Climate:	subtropical; 10 - 30°C; 29°S - 35°S
Global Importance:	fisheries: commercial; aquaculture: commercial
Resilience:	Medium, minimum population doubling time 1.4 - 4.4 years (tm=2-3)
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:	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). Feeds 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)
Threatened:	Vulnerable, see IUCN Red List (A1cd) , (Ref. 36508)
Dangerous:	harmless , Merrick, J.R. and G.E. Schmida. 1984
Coordinator:
Main Ref:	Paxton, J.R., D.F. Hoese, G.R. Allen and J.E. Hanley. 1989. (Ref. 7300)
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Australia country information
Common names:	Silver perch, Bidyan, Bidyan grunter, Bidyan perch, Black bream, Grunter, Murray bream, Murray perch, Silver bream, Sooty grunter, Tcheri, Silver perch	Ref: Seafood Services Australia, 2004
Status:	endemic	Ref:
Salinity:	freshwater
Importance:	commercial	Ref:
Aquaculture:	commercial	Ref: Arthington, A.H. and F. McKenzie, 1997
Regulations:	no regulations	Ref:
Uses:	gamefish: yes
Comments:	Occur in the Murray-Darling system. The extensive spawning migrations of adults pose a fishery management problem. Access to upstream spawning areas may be blocked by high level dams or altered thermal regimes which might cause considerable drop in recruitment (Ref. 2906). Conservation status : vulnerable in Victoria (Ref. 48666). Also Ref. 7300.
States/Provinces:	New South Wales (native) Queensland (native) South Australia (native) Victoria (native)
States/Provinces Complete?:	Yes
Country Information:	www.cia.gov/cia/publications/factbook/geos/as.html
National Fisheries Authority:	www.csiro.au/
Occurrences:	Occurrences Point map
Main Ref:	Allen, G.R., S.H. Midgley and M. Allen, 2002
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Modified: Ortañez, Auda Kareen

Entered: Agustin, Liza Q.

CGNET - US

Page created by: Eli, 20.10.03, last modified by Eli, 26.06.07

	Ref.:		Glossary
		(e.g. 9948)		(e.g. cephalopods)
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