Release of species of Pelteobagrus fulvidraco cultured in cage

I) preparation before release of fish fry

1. The preparation of different specifications of cages should be based on the specifications of the fish species in the box. If the size of the box is 2 cm, the second or third class fish cage and the second class adult cage should be prepared. if the size of the fish is 5 cm, the secondary fry and the secondary adult cage should be prepared, and the first class cage should be prepared for more than 10 cm.

two。 Artificial feed is the material basis of cage culture of Pelteobagrus fulvidraco. Pelteobagrus fulvidraco is required to be fed within 1-2 days after it is put into the box. Therefore, feed should be prepared in advance. Feed should be prepared according to the specifications of Pelteobagrus fulvidraco into the box, if the size of the fish into the box is small, not domesticated or not good, fresh animal feed should be prepared; on the contrary, if the size is large and has been domesticated, artificial pellet feed of corresponding specifications should be prepared.

3. Cage safety inspection should be in place before and after launching, the net body should be strictly inspected, if found to be damaged, loopholes, immediately repair on the spot to ensure the safety of the cage. This is the key to the success or failure of aquaculture, must not be careless.

II) the density of fish stocks

1. The cage raising of commercial fish, Pelteobagrus fulvidraco, which is cultivated by summer flower fish species, is usually reared in four-level cage at present, and when the fish species are too small, five-level cage culture should be considered. The first cage grows from 2 cm to about 4 cm, the second cage from 4 cm to 5 cm, the third cage from 6 cm to 8 cm, and the fourth cage from 8 cm to 10 cm long to adult fish on the market. The stocking density of the first, second, third and fourth cage is 2000,3000, 1500,600 and 350,450 fish per square meter, respectively.

two。 The cultivation of Pelteobagrus fulvidraco with winter fillet is a good way to balance the market of commercial fish. The multi-stage cage breeding introduced above refers to the form of cultivating summer flower fish into commercial fish in the same year, which is a more popular intensive culture mode of Pelteobagrus fulvidraco at present. The commercial fish cultivated from winter fillet fish is the winter fillet fish cultivated by the pond in January to March of each year. For example, the overwintering condition of the breeding pond is poor, and the fish can be put into the box to overwinter in the deeper water body from November to December (of course, the density can not be high). There is another situation, that is, some of the fish species in the cage that year did not grow into commercial fish can only be cultured as fish species in the second year, that is, they can only be cultivated in the first year and commercial fish in the second year. This form is also one of the ways to improve the efficiency of Pelteobagrus fulvidraco to break the seasonal restrictions and balance the market all the year round. The stocking density of winter fillet fingerling is 300 fish per square meter, or 500 fish per square meter.