The newly arrived fry have weak resistance and different specifications; If it is directly put into the pond for breeding, it will be wasted and pollute the water quality because of the large range of fry activities, high physical consumption and the hard-to-eat bait. However, if two-stage seedling release is implemented, that is, intensive cultivation is concentrated in a small pond first, and then raised in a large pond.

This is not only convenient for management, but also makes fry adapt to the new environment better, and it is easy to get enough food in the pond to promote their rapid growth.

When the fry cultivated in the small pond reaches about10 ~15cm, the big fish can be screened from the pond and fed in the big pond, and the small fish will remain in the small pond for intensive cultivation, so that the fish can grow in a balanced way and have the same specifications. This avoids the phenomenon of big fish eat small fish in the process of culture, thus effectively improving the survival rate and unit yield of fry.

2. Feed the bait reasonably.

Sea catfish is an omnivorous fish, which is gluttonous. Therefore, it is necessary to correctly control the feeding amount, so as to ensure that there are as many fish as there are in the pond and prevent blind feeding. At the same time, it is necessary to feed at different points, spread bait evenly, eat a small amount of food, and feed enough to prevent uneven hunger and satiety and polarization.

At the same time, in the early stage of fry cultivation, animal feed should be given priority to and intensive cultivation should be carried out. With the growth of fish, some plant feed should be gradually switched to achieve the combination of animal and plant feed. The daily feeding amount should be controlled at about 5 ~ 8% of the total weight of fish, and the feeding amount should be adjusted every 1 week or half a month to make the feeding amount more reasonable.

3, the implementation of rotation capture and separate support.

Because the sea catfish is fierce and gluttonous, when feeding, the big fish often grab the food first, but the small fish can't eat the food, resulting in a growing gap in fish size. Therefore, before catching the sea catfish, it is necessary to take a turn to catch and raise the big and small fish in separate ponds to achieve a balanced growth. This is one of the important measures to increase output.

4. Advocate sea catfish to overwinter.

When fishing in autumn, in addition to selling big fish, some adult fish can be moved into deep pools for wintering (nylon shed is built on the pond) to sell early spring fish; This can not only solve the problem of difficult sales of sea catfish in peak season, but also prolong the supply time of fresh fish, and the price of fish can be doubled, killing two birds with one stone.

Extended data

mannerism

? ? ? ? It is an offshore bottom fish, often lurking, and uses the flap of the first spine of dorsal fin as bait to trap those fish and shrimp that are phototropic. ? ? ? ? Fish basically eats food, and delicious food is always delivered to its mouth. Fishing at sea? ? ? ? Fish, usually females, generally do not see males.

This is because the male fish parasitizes the female fish when they are very young, and most of them have become an organic whole with the female fish, but the body shape of the male fish can still be distinguished by careful observation. It is rare in the animal kingdom that men and women are so close. However, there are also very few males who live alone. It is said that some people catch males off Iceland. ? ? ? The weight is only one thousandth of that of a healthy female.

? ? ? ? Is a professional fishing expert. Its fishing rod evolved from the first fin spine of the dorsal fin. The fishing rod stands above the giant mouth. ? ? ? ? There are many kinds of fishing rods. ? ? ? There are fishing rods with different lengths, thicknesses, sizes and hardness. Some fishing rods look short, but they are very elastic and can be ejected far away.

At the top of the fishing rod, there is a fleshy ball or membrane to attract the attention of small fish. This is? ? ? ? The bait is called mimicry in biology. Some live in the dark deep sea? ? ? ? There are also baits that can glow.

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