In order to achieve good aquaculture efficiency, it is necessary to proceed from the market demand, and do a stocking plan for fish according to pond conditions, seed and feed sources, aquaculture technology level, capital input capacity, and past years of aquaculture experience. Determine the specific fish stocking plan can be considered from the following aspects.
Breeding varieties Breeding varieties should be marketed and have good economic benefits. For the current stage, the breeding technology is not mature, the feed is not guaranteed, the source of the seed is difficult or the market is small. Careful selection should be made. The species with less certainty should not be reared on a large scale, but it can be conducted on a small area to be mature. After the experience, expand the aquaculture area.
Breeding cycle selection of short cycle species, so that the rapid recovery of funds, economic benefits are also high. Two-year-olds are raised each year. The first fish is stocked with large-sized second-instar fish after the fall of commercial fish, and will be intensively cultivated in the spring of the second year. The fish will be released at the end of June at the latest. The commercial fish must meet the specifications required by the market. . After the commercial fish is out of the pond, the fish ponds will be treated immediately. The fish can be stocked to continue to grow into fish, and the summer fish can also be stocked. If it is determined to farm grass carp, the size of the stocked fish species should be determined according to the plan. Commercial fish should be stocked with large-sized grass fingerlings larger than 250 g/tail to ensure that they can grow into commercial fish. If you want to develop second-instar fish species, you can stock smaller-sized spring fish species. For long-cultivated species, budgets must first be made for economical aquaculture, and must not be wasted.
Mixed breeds should be based on the food habits of fish and use pond feeds and water bodies in a rational manner, and give full play to the mutually beneficial relationship between farmed fish. Feeds for commercial feeds are mainly eaten by fish that have strong ability to catch food such as grass carp and squid. Some of the smaller pellets are eaten by catfish, scorpion fish heads and various small-size fish species, and some of them are powdered feeds. It is used by squid and squid and all product feeds can be used directly and effectively. The excrement of eating fish can provide a lot of organic debris for squid and squid, and provide enough fertilizer for plankton. At the same time, squid and squid can also play a role in regulating water quality and reducing the eutrophication of the water environment.
Each fish has its own habitat. The plankton and carp of the staple food plankton live in the upper layer of the water body, grassy fish such as grass carp, and head carp, etc. live in the middle and lower layers of the water body, and the earthworms, earthworms, tilapia, etc. inhabit the bottom layer of the water body. When these fish are mixed together, they can make full use of the pond water body, that is, without increasing the local density, the stocking density of the entire fish pond can be increased, thereby increasing the yield and economic efficiency of fish ponds.
Stocking Density The stocking density and yield are positively proportional to a certain range. The stocking density is increased and the yield is also increased. However, after the fish production reaches a certain value, the stocking density is further increased and the yield is increased slowly. It is also necessary to ensure that the fish out of the market meets the specifications required by the market. Therefore, the density of stocking should be determined according to the pond conditions, stocking fish species, specifications, out-of-species and feeding management levels, and capital investment.