Attention should be paid to the parent cultivation of herring

The cultivation of parent fish is not only related to the goal of inducing estrus and giving birth, but also directly affects the number of eggs, hatching rate, survival rate and growth rate of fry. Therefore, according to the different stages of gonadal development of parent fish, we should formulate a comprehensive and effective cultivation measures to create good conditions to meet the ecological requirements of different stages of gonadal development of parent fish and ensure the gonadal development and maturity of parent fish.

1. Postpartum cultivation

During this period, the herring ate vigorously, but after induced delivery, the physical consumption was huge and suffered a certain degree of damage, so we should first feed some snail, clam, shellfish and so on to restore its physical strength. 5-10 days later, bean cake, malt and other concentrate were added properly to rejuvenate it.

2. Cultivation in autumn and winter

The cultivation in this period is easy to be ignored, but in fact, autumn and winter cultivation is more important. The reasons are:

The main results are as follows: 1) after postpartum cultivation, the herring's physique can be restored and its appetite is exuberant, and autumn and winter is the beginning of the second cycle of reproduction, which is the basis of reproduction in the following year. Therefore, it is necessary to strengthen bait, mainly fresh bait snail, clam and shellfish, and appropriately increase concentrate to facilitate gonadal development.

2) cultivation in autumn and winter is the guarantee for parent fish to survive the winter safely. With the gradual decrease of water temperature and the decrease of feeding intensity of parent fish, concentrate should be used to facilitate fat accumulation and survive the winter safely.

3. Spring (prenatal) cultivation

You should start eating as soon as possible after the beginning of spring. In ponds with suitable conditions, replace the "old water" with 1x3pm and 1ppb, and add new water to keep the water level at about 1 meter, so as to improve the water quality and raise the water temperature, which is beneficial to the feeding of herring. At this time to feed live snail, clam, clam meat, supplemented by a small amount of bean cake or malt, to avoid eating concentrate and grow too fat to affect spawning. Special attention should be paid to regular flushing to keep the water quality fresh. The flushing times should be determined according to the water quality and the feeding condition of the parent fish. If the water temperature is low and the water is thin, the flushing times should be increased as the water temperature rises and the water concentration increases. It is necessary to increase the flushing times in the first half of the month before delivery, preferably every 1-2 days, to keep the water quality fresh and promote the gonad development and maturity of parent fish.