Techniques for increasing production of cultured catfish

Catfish is a tropical fish with large body, more meat and less thorns, and tastes like river eel, so it is called "eight-bearded cateel". It is a good species of freshwater fish with fast growth, wide feeding habits and less diseases, but its disadvantage is poor cold tolerance, so it is easy to freeze to death when the water temperature drops below 7 ℃, so the growth period is very short, only 5 to 6 months in the whole year, because it can not pass the winter in natural waters (except Liangguang). Therefore, in the peak fishing season, the market volume of fresh fish is highly concentrated, resulting in a backlog of fish stocks, low prices and low efficiency. In addition, catfish kill each other seriously in the process of culture, which greatly affects the improvement of stocking density and yield. But if we use some production tips and use scientific methods to breed catfish, we can get twice the result with half the effort.

1. Two-stage seedling release. The newly transported fish fry have weak resistance and different specifications; if they are directly put into the big pond, the fry will have a wide range of activities, a lot of physical exertion, and the bait put in is very difficult to eat for a while, resulting in waste and water pollution. However, if two-stage seedling release is implemented, it is first concentrated in the small pond, and then put into the big pond for breeding. In this way, it is not only easy to manage, but also make the fish fry better adapt to the new environment, and it is easy to get enough food in the pond to promote its rapid growth. When the fry cultured in a small pond reaches about 10 to 15 centimeters, the large fish can be selected from the pond and put into the big pond for breeding, while the small fish remain in the small pond for intensive cultivation, so that the growth of the fish is balanced and the specifications are consistent. This avoids the phenomenon that big fish eat small fish in the process of culture, so as to effectively improve the survival rate and unit yield of fish fry.

two。 Feed properly. Catfish is omnivorous fish, sexual gluttony, so it is necessary to correctly grasp the amount of feeding, to achieve how many fish in the pond how much food, to prevent blind bait. At the same time, it is necessary to implement point-by-point feeding, uniform bait, a small number of meals, enough feeding, to prevent uneven hunger and satiety, and the phenomenon of polarization. At the same time, in the initial stage of fish fry cultivation, animal feed should be given priority to, intensive cultivation should be carried out, and with the growth of fish, some plant feed should be gradually transferred to achieve the combination of animal and plant feed. The daily feeding amount should be controlled at about 50.8% of the total body weight of the fish, and the feeding amount should be adjusted every one week or half a month to make the feeding amount more reasonable.

3. To carry out rotation and separate cultivation. Because the catfish is ferocious and gluttonous, the big fish often grab the food first, but the small fish can not eat the food, resulting in a bigger and bigger difference in the size of the catfish. therefore, a rotation should be carried out before fishing catfish, large and small fish should be raised in ponds, so that the growth can be balanced. This is one of the important measures to increase output.

4. Advocate catfish overwintering. When fishing in autumn, in addition to the sale of large fish, part of the adult fish can be moved to the deep pool to spend the winter (nylon shed on the pond) to sell early spring fish; this can not only solve the problem of catfish sales in peak season, but also prolong the supply time of fresh fish, and the fish price can be doubled. It's really killing two birds with one stone.