CATDOLL : CATDOLL: What are the advantages of fish farming in enclosures?

What are the advantages of fish farming in enclosures?

Net-enclosed fish farming is also called enclosure fish farming or enclosure fish farming. It refers to the intensive fish farming in a certain area of ​​water in lakes, reservoirs and other waters through engineering measures such as enclosure, damming and isolation. Net-enclosed fish farming is a fish farming method that combines the high-yield technology of pond fish farming with the excellent ecological environment of large water bodies, adopts mixed breeding, dense breeding, and increases the release of grass carp, carp, gill, and spinneret fish, mainly artificial feeding, and supplemented by natural bait. Its advantages are that it relies on the action of water flow to continuously renew the water body in the enclosure area, the water is rich in dissolved oxygen, and the fish excrement and food residues can be diluted and diffused in time. Fish in the enclosure area can reduce the harmful effects of ferocious fish and reduce the energy consumed by foraging, so the survival rate is high, the growth is fast, the feed coefficient is low, the meat increase rate is high, the cost is low, and the economic benefits are good.

The method of fish farming in seine nets is as follows:

1. Water. The water flow is slow, with a maximum flow rate of less than 0.3 m/s. The water depth is between 1.5 and 3 m, the water level difference is within 1 m, and it is far away from waterways and pollution sources.

2. Enclosure. Use double-layer and double-row enclosure nets, fix the bottom net with stones and ground anchors, and set escape prevention observation cages between the two layers of nets. In intensive aquaculture and high-yield areas, the inner net should use double-sided cage nets with a net height of twice the maximum water depth. The fish net should use polyethylene mesh with a mesh size of 1.11 cm to 1.33 cm, and the adult fish net should use polyethylene mesh with a mesh size of 1.90 cm to 2.22 cm.

3. Species. Choose fish species with strong physique and uniform size. The size of grass carp species is 200-250 grams per fish, the size of black carp species is 500-1000 grams per fish, the size of crucian carp species is 50-100 grams per fish, the size of carp species is 25-75 grams per fish, the size of crucian carp species is 50-100 grams per fish, and the size of silver carp and bighead carp species is 150-400 grams per fish.

4. Bait. Fresh aquatic plants and snails are the main feed, supplemented by fine feed. The feeding mode of "fine feed at both ends and green feed in the middle" is adopted, and the feeding method of fixed time, fixed location, fixed quality and fixed point is adopted.