Spring is the key period for the growth and development of the gonad gonads. The quality of broodstock cultivation at this stage is directly related to the success or failure of artificial breeding of the four major fishes. Therefore, we should pay special attention to spring cultivation.
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First, the conditions of broodstock cultivation pool:
The position of the broodstock is close to the water source, which facilitates drainage and irrigation and facilitates the regulation of water quality. Water quality fertilizers and water-retaining ponds should be used as breeding ponds for alfalfa and eels, and ponds with thin, micro-flowing water should be used as breeding ponds for grasses and herrings. Area of ​​5 acres ~ 7 acres, water depth of about 1.5 meters, with the east-west of the rectangle as well. The eel and eel breeding ponds should have about 20 cm deep pond silt to make the water fertile. Grass and bluefish cultivation ponds should have little or no silt.
Second, the broodstock stocking density:
The broodstock breeding pond should be designed to raise a broodstock and polyculture with a small amount of other fish. The stocking density depends on pond conditions and the management of feeding techniques, but the total weight of broodstock per acre is generally not more than 160 kg. If there is more wild fish in the pool, a small number of individual feral fish can be released. , such as mullet, salmon, California salmon.
Third, broodstock breeding:
1 fertilization. The cultivation of oysters and broodstock is mainly based on fertilization. The manure pool fertilizes about 70% of the manure and the livestock manure accounts for about 30%. The squid pool is dominated by chicken manure, which generally accounts for 70% and human excrement accounts for 30%. Fertilization should be based on the color and temperature of the flexible grasp, so that less Shi, Qin Shi, about once a week fertilization, each about 120 kg per acre. The color of the carp pool should be yellow-green and oil blue, and the carp pool should be dark brown. 2 feeding. Grass carp generally feeds malt, grain buds and bean cakes in the early spring, and can also be supplemented with vegetable leaves and lettuce leaves. Each feed 50 grams to 100 grams per day, feed should be cast on a fixed food table, the late should be rye grass, water grass and other green feed, supplemented by fine material. The ratio of green material to fine material is 20:1. The daily feeding amount was about 30% of the fish's body weight and the degree of eating was 2 hours. Herring is mainly fed with snails, clams and quail meats, supplemented with bean cake or artificially processed pellet feeds, etc., and is full.鲢 鳙 鳙 鳙 鳙 鳙 鳙 鳙 2 2 2 2 2 2 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 3 water quality regulation. Before spring fertility feeding and fertilization, the old water in the pool should be replaced by half, and new water should be added to maintain the water depth at about 1 meter. This will help increase the temperature of the pool water and material energy conversion in the pond and promote the growth and development of the broodstock. Spring flushing is also an important measure to promote gonad development in broodstock.鲢 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 一般 一般 一般 一般 一般 一般 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙 鳙The water should be flushed once every other month, and the brooding and brooding fish ponds can keep the original pond water or separate ponds flush with each other in order to maintain the pond's fertilizer and water. When flushing, the speed of water flow should be moderate. If you are too rushed, you will consume too much of your broodstock and slow your flushing effect. 4 patrol ponds and disease prevention. Every morning and evening, each pond should be inspected once to check whether there is any increase or decrease in food intake and water quality, so as to determine the amount of feed and fertilization. If panpool omen or fish are found to be floating heads, new water or an aerator must be added immediately. Every two weeks, after the broodstock eats, the food field is disinfected once with bleaching powder or copper sulphate and other drugs, and the amount is about 250 grams.
