The rational allocation and stocking of fish species is a process of realizing the rational configuration of the biological structure of ponds, which is also an important part of improving the economic benefits of pond fish farming. The key to improving the economic benefits of fish farming is: variety, collocation and stocking. one. Variety The low breeding grades, the concentrated production, the slow sales of fish products, and the rising prices of raw materials (fish species, feed, fish medicine, etc.) have led to a decline in the economic benefits of fish farming. Therefore, the preferred cultured species can not be ignored. In addition, it is also necessary to improve the quality of fish products, implement anti-season production, and optimize traditional aquaculture structures. two. With The adoption of multi-species polyculture is one of the important characteristics of pond fish farming in China, and it is also one of the important measures to increase the fish production and economic benefits of the pond. Polyculture can rationally use bait resources and water resources, can play a mutually beneficial role among farmed fish, can increase production and reduce costs to obtain more considerable economic benefits. This is an important step for “comprehensive utilization of water bodies, rational allocation of biological structures, optimization of compositional economic components, and realization of a virtuous cycle.†Pond natural food organisms provide fish production such as earthworms and other filter-feeding (water fish) fish, and the high limit is about 400 kg. The significant increase in fish production should be based on increasing the stocking ratio of fish (eat fish), improving feed quality, and strengthening oxygenation measures. 1. Carp: carp storage 300kg/mu or more, optimum proportion of carp 4~5:1; carp storage 200kg/mu or more, optimum ratio of carp 3:1; carp storage The amount is 100~150kg/mu, and the optimum ratio is 2:1. 2. Mandarin fish, tilapia, and white gizzards: Their polyculture ratio depends on their ability to filter and feed, and their ability to filter foods is stronger than that of tilapia and white gizzards. However, the eel's ability to swallow is less than that of the latter. Therefore, the stocking ratio of tilapia and silver carp should be lower than that of alfalfa, otherwise it will inhibit the growth of carp. The stocking ratio of quail and tilapia and white plover is 2 to 3:1. 3. Grass carp and squid: These two fishes have different diets and habitats. The natural food used in the pond is also different, but the ability of the grass carp to eat more is higher than that of the carp when feeding artificial bait. Therefore, the carp can be kept less in the main grass carp pond in order to make full use of benthic organisms and artificial baits. The main eel ponds are usually not with grass carp. In ponds with aquatic plants, depending on how many acres of aquatic plants are placed, 20 to 50 grass carp species with a weight of about 100 grams can be placed to control aquatic grasses. The main grass carp ponds, depending on the amount of grass adult fish, can stock 50 to 100 tail carp species. 4. Herring and squid: They both inhabit the bottom and have some overlap in their diet. In the pond where the main herring is reared, only a small amount of carp species can be placed, with no more than 50 per mu. The pond that raises the eel generally does not place herring. three. Calculation of stocking capacity In general, the stocking density in a certain range is positively correlated with the fish yield; it is negatively correlated with the pond size. When the stocking density exceeds this range, both the fish production and the out-of-water specification decrease. 1. Squid: The stocking density of common carp summer flowers is generally 500 to 600 (mixed yield per mu up to 400 to 500 kg). The stocking density of anchovy springs is about 500 mu per mu (up to 700-800 kg per mu). When the pond conditions are good, the feed quality is high, and the oxygen enrichment equipment is perfect, the stocking capacity of mu can reach 1000 to 1500 tails (up to 1300 to 2000 kg of mixed-breeding yield). 2. Grass carp: The stocking density depends on the planned output, generally adopting large-, medium-, and small-scale polyculture (large grass grass species 500-700 g/tail, medium size 150-250 g/tail, small size 20-50 g/mu). . For example, a total of 900-1,000 kilograms of mixed crops will be stocked, and 80 to 100 tailstocks of large-scale species of grasses will be stocked; 120 in the medium specification and 200 in the smaller size. 3. Squid: The stocking density is about 240 to 350. The proportion of squid depends on the size of the squid. Generally, squid has a larger size and can be put in more suitable. The percentage is controlled from 10% to 15%. However, it should not exceed 20%. The main carp ponds are mainly fertilized, and carp only feed on natural foods, and their mu yield can reach 113-417 kilograms. More than 300 kilograms or more, most use round catch. There are many specific calculation methods, and the planned production method is generally used. The following example shows how to calculate the stocking rate using a 1000-kilogram pond per mu. The first step: Determine the fish load in the pond based on the conditions of the pond. Properly allocate the mu yield of various fish and determine the specifications of the out of the pool. The main breeding carp per mu 1000 kg stocking mode calculation table design 1000 kg per mu; where: Zhai Zeyi: The main consideration is to make full use of residual baits to increase production. The per mu design is 20 kg. Out of specifications 0.4 kg. Mission head lice: It is also considered to make full use of the residual baits. To increase the output of the pond specifications, it is not appropriate to plan too much. The per mu design is 10 kg. Out of specifications 0.35 kg. Big buzz: To clear the fish in the pool and reduce the floating head. Conventionally, a small amount of carnivorous fish can be stocked. However, it is advisable to pay attention to the stocking specifications so as not to endanger the stocking of fingerlings. The per mu design is 5 kg and the discharge specification is 1.5 kg. The main squid is raised: it is based on the production of the deficit. The calculated yield per mu is 640 kg and the discharge specification is 1.75 kg. The second step is to design the survival rate of various species of fish. Here, we mainly consider the loss of mantissa caused by stocking errors and fish diseases. This can be determined based on years of experience. But it cannot be estimated too low. Step 3: Determine stocking specifications based on the availability of fish species and price factors. It is then calculated by the computer itself. Step 4: Refer to past experience and make repeated changes. Make it more reasonable. About the stocking specifications, it can be calculated based on the weight gain multiple. However, the weight gain is not easy to design. If the design is too small, it will increase the amount of injection to increase the cost of restocking. Finally calculate the input cost of mu and the output value of mu. Catheterization Kit,Urethral Catheterization,Disposable Urethral Catheterization Set,Disposable Catheterization Shaoxing Jenston Medical Products Co., Ltd. , https://www.sxjcmed.com
In determining the variety and proportion of polyculture, fish should be rationally configured according to the biological characteristics of fish, and scientifically design the proportion of various stocking fish.
5. Squid and mackerel: There is also overlap in the feeding habits of the two fish. They compete for large zooplankton in the same pond. Therefore, less carp is placed in the main carp pond to effectively use small zooplankton and control rotifers. Biomass to avoid causing hypoxia. However, the amount of carp stocks can only be controlled by one-third of the carp, otherwise it will inhibit the growth of carp.
Flower white peony: Use the filter-feeding characteristics of the flower white peony to purify the water quality and make full use of the natural bait resources of the water body without using organic fertilizer. Increase production and economic efficiency. In order to improve the output specification of the white peony, the design should not be too high. White buckwheat mu production design is 250 kg; buckwheat mu production 75 kg specifications white buckwheat 1 kg/tail; flower pod specifications 2 kg/tail;
The rational mix of fish polyculture