Silver+Perch+(Bidyanus+Bidyanus)


 * Silver Perch**
 * (Bidyanus Bidyanus)** media type="file" key="DSCN0625.mp4" width="300" height="300" align="right"

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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.

[[file:///G:/TAFE/Aquaculture/Stock/stock/species/silver_perch.htm#id|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.

[[file:///G:/TAFE/Aquaculture/Stock/stock/species/silver_perch.htm#habitat|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.

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[[file:///G:/TAFE/Aquaculture/Stock/stock/species/silver_perch.htm#waterquality|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 ||

[[file:///G:/TAFE/Aquaculture/Stock/stock/species/silver_perch.htm#feed|Feed]]
24 - 30 || 5 10 || 3 5 || 15 - 18 19 - 23 24 - 30 || 1 2 3 5 || 1 2 3 3 || 19 - 23 24 - 30 || 1 2 3 || 1 2 2 || 19 - 23 24 - 30 || 1 2 3 || 1 2 2 ||
 * **Fish Size (g)** || **Pellet Size** || **Water Temp °C** || **Feed Rate (% Body Weight)** || **Feed Frequency (times/day)** ||
 * 0.5 - 4 || 2 mm Crumble || 18 - 23
 * 5 - 30 || 3 mm Crumble || 10 - 14
 * 31 - 250 || 3 mm Pellet || 10 - 18
 * 251 - 1000 || 6 mm Pellet || 10 - 18