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Manual to raise rainbow trout in a
Generally, one male to three females is deemed a satisfactory sex ratio for broodstock. Males and females are generally kept separate. Broodstock maintenance can be costly and labour intensive, causing some farms to purchase eyed eggs from other sources; these should be 'certified disease free.
A licence from the Dept of Environment and Climate Change is needed to return effluent water to natural waterways and all water must first pass through stuffit expander update windows a settlement pond. Markets Trout have high meat yields and sell well.
Females are able to produce up to 2 000 eggs/kg of body weight. Eggs are relatively large in diameter (3-7 mm). Most fish only spawn once, in spring (January-May although selective breeding and photoperiod adjustment has developed hatchery strains that can mature earlier and spawn.
Hatching and rearing troughs are 40-50 cm wide, 20 cm deep, and up to about 4 m in length. They usually have 2 layers of eggs placed in wire baskets or screened trays (California trays) supported 5 cm above the bottom, and water passes through.
Trout Farm Production For the production figures see the. NSW DPI aquaculture production reports. Reproduction In the hatchery, wild or captive female trout are stripped and the eggs fertilised by mixing with milt from the males.
Fertilised eggs can be transported after 20 minutes, and up to 48 hours after fertilisation, but then not until the eyed stage (eyes are visible through the shell). Direct exposure to light should be avoided during all development stages, as it will kill embryos.
P. 1980, Trout farming manual. Fishing News Books.