First, breeding habits. Shrimp is dioecious and the main difference is that sexually mature males are more powerful than females for the second time, typically 1.5 times the body length. The spawning season of the shrimp is from April to September, the peak period is from June to July, and the spawning water temperature is above 18°C. After mating with the shrimp, eggs can be laid within 24 hours, and the amount of egg is generally between 1000-2500 capsules. The eggs of the shrimp are oval in shape, and the produced eggs form clusters on the stomach feet of the female bristles. The continuous swing of the swimming feet provides good oxygen conditions and promotes hatching of shrimp eggs. The entire incubation period takes about 22-25 days.
Second, breeding pond preparation. The nursery pond requires sufficient water sources, convenient drainage and irrigation, and no pollution. The area is generally 1-2 mu and the water depth is 1-1.5 meters. Remove excess sludge before use and thoroughly clear the pond with quicklime. After the efficacy fails, use a 80-mesh sieve to inject new water.
Third, the choice of broodstock. Egg-holding green shrimp can be caught in aquaculture ponds or natural waters. The time is generally in early May. Individuals of broodstock are required to be more than 5 cm, with well-developed gonads or large amounts of eggs, complete limbs, and health-free disease. The proportion of males and females in the non-breeding season is 2:1 or 3:1. Only the female shrimp can be used during the breeding season.
Fourth, broodstock stocking. It is best to select the broodstock where the eggs that have been held have appeared, so that the size of the larvae will be neat. Generally about 10 kilograms of broodstock per acre can be placed directly in breeding ponds. It is advisable to place a thin net cage (100 cm, 70 cm, 50 cm in size) in the shallow water area of ​​the pond. The selected oviposition shrimp should be weighed at 0.5-1 kg per carton. When the shrimp eggs are hatched, the cages are removed and the broodstock can be put on the market. .
Fifth, broodstock breeding. After the brooding broodstock is placed in ponds or cages, it is fed once a day. The feed varieties include chopped snails, quail meats, vegetable cakes, bean cakes, bran and other animal and plant foods. The daily feed amount accounts for 5-7% of the total weight of the broodstock, takes 1-2 hours to finish, and it is necessary to wash the cage frequently to make the exchange of water bodies inside and outside the box unimpeded and maintain good water quality.
Six, shrimp cultivation. When the eggs of the brood brood are transparent and the eye spots appear, it indicates that the zoea hatches. At this time, appropriate amounts of fermented pigs, cow dung and other organic fertilizers can be applied to the larvae to cultivate rotifers and horny worms. Copepod zooplankton, eaten by shrimp seedlings. After the hatching of the shrimp, the organic fertilizer is applied to the pool once every 4-5 days, each time 100-150 kilograms per mu, so as to maintain the quantity of natural biological feed. If the zooplankton feed is insufficient, the amount of fertilizer can be increased or sprinkled with 1.5-2 kg of soybean slurry per acre per day.
Seven shrimp out of the pool. After a month or so of cultivation, the larvae metamorphose into prawns after repeated molting. When the shrimp body is about 1 centimeter long, the shrimp should be cultured in a timely manner.
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