1, fish stocking In order to improve the survival rate and raise the breeding efficiency, the catfish species to be released must be more than 8cm, and the specifications should be neat. The stocking density is 8cm- 1ocm, and each mu should be released1000-1500; Put 800-1200 fish per mu in 10cm- 12cm, and mix with 150g-250g silver carp and bighead carp in the pond to adjust the water quality.
2. Catfish are carnivorous fish, mainly live fish or chilled fish and animal viscera as bait, but they can also be domesticated artificially and fed with artificial compound feed.
(1) Carnivorous bait: When raising catfish, carp, crucian carp, etc. , slightly smaller than catfish, feed chilled fish pieces every day, or feed pig lungs, bovine lungs and other animal viscera. In the case that the feed of these animals cannot be guaranteed, it can be domesticated artificially and fed with artificial compound feed, which can achieve good results.
(2) Artificial compound feed: The protein content of compound feed is 465,438+0%-50%. When feeding, each pond is provided with (2-4) bait tables, which is convenient for observing the feeding situation. Second, cage culture.
1. According to the specifications of fish species, the cage is equipped with three different net cages: first-class fish species box, second-class fish species box and adult fish box. First-class fish tank: the mesh is 0.6cm-0.8cm, and the specification is 4mx4mx2m or 5mx5mx2m, which is a single-layer warp-knitted seamless polyethylene open cage; Class II fish tank: open polyethylene nodular cage with mesh1cm-1.5cm, with specifications of 4mx4mx3m or 5mx5mx3m; ; Adult fish box: 2.5cm-4cm mesh, 4mx4mx3m or 5mx5mx3m double-layer polyethylene nodule closed cage.
2. Catfish in first-class stocking are most suitable for release in early and middle May every year. The density of released catfish is 4cm-5cm, with 500-600 catfish /m2. After feeding 15d-20d, the catfish were raised in boxes according to the size and specifications. The specification is 8cm- 10cm, and 350 fish /m2-450 fish /m2 are stocked. When it reaches 15cm, it is transferred to a secondary box for breeding, and 250-300 fish /m2 are stocked. When the fish reaches about 25g, it is transferred to the adult fish box for stocking 40 fish /m2-60 fish /m20.
3. The bait table is arranged in the bait feeding cage, which is convenient for observing the feeding situation of fish and making full use of bait. Generally, there are 1 bait tables per 10 m2, which are hung in the box and 20 cm-30 cm away from the bottom of the net. When Silurus meridionalis is 5cm- 10cm in length, the daily feeding rate is 8%- 10% of the fish weight. When the total length is 10cm-20cm, it can be adjusted to 4%-6%; When the total length exceeds 20cm, the feeding rate is 1%-3%. Feed it three times a day in the morning, at noon and at night. Among them, the amount of bait increases slightly at night, and the bait can be mainly wild miscellaneous fish, chilled fish and animal offal, or artificial compound feed can be fed through artificial domestication. The method is as follows: after the fish enters the box, stop feeding 1d-2d to make it feel a little hungry, then put a small amount of attractant on the bait table every day, and slowly feed the artificial compound feed, and reduce the dosage of attractant accordingly with the adaptation of the artificial compound feed until the catfish completely adapts to the artificial compound feed.