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Pelicans and earthworms feed on plankton, and they should use fertilization to promote large-scale reproduction of plankton. If there is enough feed for quail and earthworms, gonadal development is good. Therefore, looking at water fertilization is the key to raising good fleas and brooding broodstock. In particular, strengthen fertilization before winter (usually about 500 kilograms per mu per week), so that the color of the water to turn thick, while a small amount of supplementary fertilizer should also be added after the winter, fertilization should follow the principle of "more than a small amount of continuous supplement." In the fertilization process, must use ripe fertilizer, it is best to use compost water, and also should pay attention to thunderstorms and hot weather in the fall, when the pressure is low, we must strictly control the amount of fertilization, so as not to cause broodstock pan pool. In short, the stress in autumn and winter will enable the broodstock to save enough nutrients to ensure the normal development of the brood broodstock at the beginning of spring and promote the smooth maturation of the egg. In addition, the cultivation of broodstock and bream is mainly focused on normal fertilization in the fall and organic fertilizer in the winter. Among them, the carp ponds account for about 70% of manure, and livestock manure accounts for about 30%; carp ponds are dominated by cow manure, which generally accounts for 70%, and human excrement accounts for 30%.
Second, reasonable feeding.
Rational feeding is the key to fostering grass carp and bluefish broodstock. In autumn, as the water temperature decreases, the feeding intensity of grass carp gradually decreases, and the source of green material is also insufficient. During this time, concentrates should be used as the main ingredient to strengthen cultivation. Generally, the weight of each broodstock is 10-15 kg, and about 50 g of concentrate is fed every day. At the same time, in order to promote broodstock feeding and be well-digested, fine and green materials should be put in time. Normally, the green material should be placed in the morning, accounting for 30-50% of the broodstock's body weight, and the concentrate in the afternoon should be 2-3% of the body weight of the broodstock. After entering the winter, the feeding of concentrate should be reduced. Normally, it should be put in every other day when the water temperature is high, and once in 3 days when the water temperature is low. Herring is mainly fed with snails, clams and quail meat, supplemented with small amounts of soybean cake and other concentrates. In autumn and winter, feed should be reduced appropriately, but care should be taken to ensure that the fish are full.
Third, timely new water. Adding new water to keep the water in the pool fresh is beneficial to the development and maturation of the gonads. Generally, new water should be added according to the season, water quality, thin and broodstock feeding conditions. In autumn and winter, it is usually flushed every 10-15 days, each flushing for 3-5 hours, so that the water level rises by 10-17 centimeters. should. However, it should be noted that in order to maintain a certain degree of fatness in the water quality of broodstock and puffer fish ponds, flushing of broth and broodstock ponds should be less appropriate.
Fourth, fish disease prevention and management. Prevention of fish diseases focuses on prevention. Generally, the table is sterilized once every 15 days with bleaching powder, and the food table should be regularly cleaned and dried. When the new water is added, blocking facilities should be installed to prevent the enemy from entering the broodstock. In the fall of fish disease, the inspection and management of ponds should be strengthened to prevent flooding. Management should be done in order to cultivate broodstock, full-time staff management, and special feeds. The management must be strict and rigorous.
Cultivation and Management Techniques of Broodstock in Autumn and Winter
First, look at water fertilization.