Silver Perch
(Bidyanus Bidyanus)



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The silver perch is native to the east coast of Australia. Silver perch survive in a wide range of temperatures. They eat both live food and plant life, and can therefore be a very economical fish to farm. The flesh of the silver perch is white, and is generally very tasty.


Identifying features

The silver perch is a silver-grey fish with dark fins. It can grow to 70 cm and weigh 7.7 kg, though it is commonly found at about 35 - 40 cm and 0.7 - 1.5 kg. The main identifying features of a silver perch are:
  • the caudal fin (tail) is only slightly forked in comparison to the tail of other fish
  • the end of the jaw is well short of the eye level
  • a single, long dorsal fin with 12 - 13 spines
  • an anal fin with 3 spines.



Habitat

Silver perch are fresh-water fish. They are widespread through the Murray-Darling river system in the south-east of Australia. Silver perch prefer open, fast-moving water, especially where there are rapids.

silver_perch_loc.jpg
Map ofAustralia showing silver perch habitat





Optimum range of water quality


Water quality factor
Optimum range
Temperature
22 - 28°C
pH
6.5 - 9
Dissolved oxygen
More than 4.5 mg/ l
Turbidity
30 - 45 cm
Alkalinity
20 - 400 mg/l
Hardness
10 - 160 mg/l
Ammonia
Less than 0.1 mg/l
Nitrite
Less than 4 mg/l
Salinity
Less than 4 ppt



Feed


Fish Size (g)
Pellet Size
Water Temp °C
Feed Rate (% Body Weight)
Feed Frequency (times/day)
0.5 - 4
2 mm Crumble
18 - 23
24 - 30
5
10
3
5
5 - 30
3 mm Crumble
10 - 14
15 - 18
19 - 23
24 - 30
1
2
3
5
1
2
3
3
31 - 250
3 mm Pellet
10 - 18
19 - 23
24 - 30
1
2
3
1
2
2
251 - 1000
6 mm Pellet
10 - 18
19 - 23
24 - 30
1
2
3
1
2
2