Nutritional requirements of farmed rainbow trout fry for feed
According to the nutritional needs of rainbow trout and the supply and cost of raw materials in developing countries, UNDP and FAO put forward the nutritional recommendations of rainbow trout: the minimum demand for protein for rainbow trout fry is 36%; the demand for calcium is 1.0%-1.5%; the demand for available phosphorus is 0.5%-0.8%; and the minimum demand for lysine is 2.0%. The minimum demand for methionine and cystine is 1.2%; the minimum demand for digestible energy is 1506.24 kJ / 100g; the minimum demand for vitamin An is 600000 international units; the minimum demand for vitamin D is 100000 international units; the minimum demand for vitamin E is 6000 international units; the minimum demand for vitamin K is 1.2g; the minimum demand for vitamin C is 24.0g. The minimum demand for vitamin B1 is 2.4g, for vitamin B2 is 2.4g, for pantothenic acid is 6.0g, for niacin is 12.0g, for vitamin B6 is 2.4g, for biotin is 0.024 g, for folic acid is 0.6g, and for choline chloride is 54.0g. The minimum demand for vitamin B12 is 2.4 g, for mineral iron is 5.0 g / 100 kg, for mineral zinc is 3.0 g / 100 kg, for mineral manganese is 2.0 g / 100 kg, for mineral phosphorus is 10.0 mg / 100 kg, and for mineral cobalt is 1.0 mg / 100 kg. The demand for mineral selenium is 10.0 mg / 100 kg.
After matching the feed raw materials according to the nutritional requirements, the feed materials are processed into particles with a diameter of 4mm and fed. When the water temperature is above 3 ℃, it is necessary to feed them two or three times a day when the temperature is right. The daily feeding amount is 1% to 3% of the body weight of fish. It is better to eat 80% full food. Excessive feeding will cause poor growth of rainbow trout and even lead to diseases.
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Selection of juvenile fish and management methods of adult fish in brocade carp culture
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