High density fish culture

High-density cage fish culture adapts to a wide range of waters, which can be set up in lakes, reservoirs and rivers, as long as the water depth is greater than the cage height, 60-80 carp species with a body length of 13-20 cm can be released per cubic meter, and the breeding period is 200days. generally, the net weight of each tail can reach 0.65-0.75kg, and the yield per mu can reach 15000-25000 kg.

I. methods of fish culture in high-density cage

1. High-density cage fish culture adapts to a wide range of water areas, and it can be set up in lakes, reservoirs and rivers. As long as the water depth is greater than the height of the cage, a "pond in the water" can be built, which is more suitable for high-density culture of single or multi-species than that of land ponds.

2. High-density cage fish culture is a new fish culture technology which combines the superior environmental conditions of large and medium-sized water bodies and the intensive culture method of small water bodies. Eutrophic waters can usually set up 1 mu cage per 100 mu of water surface. 1 mu cage can be set up for every 200 mu of medium-nutrient water.

3, for example, carp can be raised in cages, 60-80 carp species with a body length of 13-20cm can be released per cubic meter, and the breeding period is 200days. usually, the weight of each tail can reach 0.65-0.75kg, the yield per mu can reach 15000-25000 kg, and the high yield per mu is more than 50,000kg. High-density cage fish culture is also one of the important ways of natural water culture in the future.

4. like other fish culture methods, it can also be summarized as coarse culture, semi-intensive culture or intensive culture according to the feeding situation, which depends entirely on natural bait that can be obtained, such as organic detritus, plankton, drift, etc., during which there is no need to put any supplementary feed. This method is suitable for filter-feeding fish such as silver carp and bighead carp.

5. Semi-intensive breeding mainly uses local materials to add an appropriate amount of forage or agricultural products and other low-protein (20%) formula feed.

6. Semi-intensive and intensive fish are feeding fish, such as grass carp, carp and catfish, and their yield is higher than that of coarse culture. Generally, in the case of rough culture, the yield is between 2.5kg / m2 and 7.5kg / m2, equivalent to about 1665-4995 kg per mu.

7. The yield of semi-intensive culture is relatively high, with an average yield of about 10 kg per square meter, equivalent to about 6700 kg per mu. The yield of commercial fish in intensive culture can be dozens or even a hundred times higher than that of ordinary ponds, and the cumulative yield per mu can reach 3-150000 kg.