CATDOLL : CATDOLL: What is the ratio of the four major carps in mixed stocking? What is the annual benefit per mu?

1. What is the ratio of the mixed stocking of the four major carps? What is the annual benefit per mu?

The stocking ratio of the four major carps varies according to the different conditions of the pond. Choose the main species and match it with other fish species. At present, except for the high price of black carp (but the breeding cost of black carp is also high), the breeding benefits of the four major carps are not very good. It is recommended to choose fish species with better market benefits as the main species, and it is more reasonable to adopt the "80:20" model. The concept of pond 80:20 means: to increase the fish production in the pond, 80% of the harvested fish products are composed of the main fish with higher market economic value, and 20% of the production is composed of supplementary fish, such as filter-feeding fish that help purify water quality and predatory fish that help control wild fish and other omnivorous fish. In production practice, the 80:20 model technology can be used to cultivate fish from fry to fingerlings or from fish to commercial fish. Any kind of feeding farmed fish can be used as the main farmed fish accounting for 80%, such as crucian carp, channel catfish, roundhead bream, grass carp, carp, tilapia, freshwater silver pomfret and other high-value fish. Basic methods: 1. Prepare fish ponds using standard methods. 2. Use standard methods to select the main fish species (such as crucian carp, channel catfish, etc.) with uniform specifications, and select the auxiliary fish species (mainly silver carp) with uniform specifications to be released into the prepared ponds. When harvested, the weight of the main fish accounts for about 80%, and the weight of the auxiliary fish accounts for 20%. Some mandarin fish, catfish, California bass or other carnivorous fish can also be released to control the reproduction of crucian carp or the breeding of other wild fish. 3. Feed fish with a granular feed with complete nutrition and good characteristics according to the prescribed schedule and method. Ponds can also be managed using standard methods. This will reduce the occurrence of fish diseases, less oxygenation, and less water movement than traditional mixed culture systems. 4. At the end of the breeding cycle, all fish can be harvested at once. All individuals of the main fish can reach market specifications and have relatively uniform specifications. In the middle of the breeding period, it is also an option to catch and market them in places with better market prices. 3. Selection and stocking of fish species 1. The main fish species suitable for 80:20 pond farming include carp, crucian carp, bighead bream, grass carp, black carp, spotted forktail, tilapia, freshwater silver pomfret, etc. Suitable fish species for supplementary farming include silver carp, bighead carp, California perch, mandarin fish, etc. Below we take crucian carp as an example to illustrate the basic selection criteria for farmed fish. 2. Selection of stocking fish and its operation guide: ① Select fish species that are strong, disease-free, and uniform in size; ② Try to select original and improved species; ③ During all operations, various stresses on the fish should be avoided or minimized; ④ Select fish species with average stocking weight and uniform size that can reach market specifications within a certain breeding cycle for breeding, that is, large-sized fish species with uniform size (taking crucian carp as an example below) - Under the condition of water temperature of 26℃, it takes about 190 days to breed from fry to 250 grams; it takes about 120 days to breed from 15 grams to 250 grams; it takes about 80 days to breed from 60 grams to 250 grams. Select fish species according to the release time. 2. Reference model of 80:20 breeding and stocking in ponds Table 1. Breeding model of 80:20 breeding and stocking in ponds Variety Stocking situation Harvest estimate Remarks Number of main fish tails/mu Main fish size g/tail Silver carp Bighead carp tails/mu Main fish yield kg/mu Main fish size g/tail Silver carp Bighead carp kg/mu Crucian carp 800- 1000 50 150 405 300 100 No or less small-sized bighead carp Bream 1500 50 300 500 450 150 One-size bream that has not reached sexual maturity Carp 1000 150 350 1200 1300 260 Grass carp 800 150 400 800 1000 250 Freshwater silver pomfret on the market in summer 800 50 350 650 750 250 Tilapia 1000 50 350 720 500 260 Tilapia striata 600 50 200 550 600 150

2. How much can grass carp produce per mu? How much can it grow per year?

It depends on the water source, feeding conditions and management level. I have achieved 3,500 catties per mu, and 2,000 is fine. One-year-olds that grow fast can reach 2 catties, but this is rare. Generally, they are around 1 catty.

3. How many kilograms can grass carp yield per mu in intensive farming?

Grass carp is the main stocking, and dace, silver carp and bighead carp are appropriately mixed. Taking 1 mu as an example, the grass carp size is 250-500 grams per tail, and the stocking density is 400 tails per mu; the grass carp size is 1000-1250 grams per tail, and the stocking density is 300 tails per mu; the dace stocking density is 1500 tails per mu; the silver carp size is 300-400 grams per tail, and the stocking density is 100 tails per mu; the bighead carp size is 150-200 grams per tail, and the stocking density is 20 tails per mu. Before stocking, all fish species are disinfected by soaking in 4% salt water for 10-15 minutes.

800 grass carps, 150 crucian carps, and 30 bighead carps are placed per mu. Tongwei 126 pond fish farming compound feed and "fish-water condition" floating feed are used in a 7:3 ratio. The combination of sinking feed and floating feed not only makes grass carp grow well, but also crucian carp grow well, and the fish grow evenly, and feed is not wasted. When stocking, three specifications are stocked, 1-3 taels, 5-7 taels, and the maximum is one catty. Fish can be caught five times a year, with an average weight of 3 catties, and the yield per mu can reach more than 4,000 catties.

4. Carp yield per mu

The carp-based farming model can generally produce 1,500-2,500 kg per mu. If microporous aeration technology or flowing water fish farming is adopted, the per mu yield can be doubled.

5. How much is the per-acre income from raising grass carp? - Baidu

Usually around 10,000