The arrival of spring stocking season, how to achieve reasonable stocking of species and density is a measure to achieve good economic returns in the year. It depends on the size of the pond, the depth, the water quality, and whether the water source is fully drained or not. In short, stocking fish stocks should be based on the requirements of wheel catcher rotation and maximizing the productivity of the water body. Under the premise of developing food fish in compliance with the market specifications, proper and reasonable stocking of fish species specifications and density can improve aquaculture production and efficiency.
Reasonable stocking species specifications and carp are the main species for wheel catcher rotation. No matter which type of stocking mode is needed to put it, especially fertilizer ponds, the water body is easily eutrophicated, and the carp filters the phytoplankton effectively. Control algal overgrowth to form harmful blooms. If it is a catch-and-rotate culture mode, 150-200 g/tail large-scale fish species are used as the basis for early catches, and their stocking rate accounts for about 15%. The 50-g/day tail fish species is the main body for the round-listing after the spring release to the end of July, and the launch amount is 65%.
The squid is mainly eaten by zooplankton, and the stocking specification is 100 g/tail, and the input is about 10%.
The herring stocked with 500-700 g/tailed second-instar fish can eat large snails and aquatic insects in the pond, and the amount is 5%.
Grass carp stocking specifications are: 20% of the second-instar/fish species of 400-500g/tail; 40% of 300g/tail; and 20% of grass carp weighing 30-50g in rearing, after one year of rearing Some of them can reach the market specifications, and they can not be used as overwintering species for the second year after they have reached the market specifications.
Catfish stocking specifications should not be too large, generally 30-50 grams / tail can be. Delivered at 5%, it can also be listed before the winter.
The stocking size of C. edulis is 50-75 g/tail, which allows it to develop into a commercial fish for larger individuals. The amount of 10%.
Catfish stocking specifications are about 30 grams/tail, which can save fish species expenditures, and can also achieve higher yields, with 10%.
The stocking size of squid is 30g/tail, which can be used to develop commercial fish of market specifications and stocking capacity of 20%-15%.
The above is based on the biological characteristics of a fish food chain, reasonable specifications and density for the reference of farmers.
The practice of reasonable stocking fish density has proved that the stocking density of fish species is too little, too sparse, and the yield is low and the efficiency is poor; and if the density is too large and exceeds the bearing capacity of the water body, it will cause the dead fish or the individual skinny to reach the market specifications. The following describes several technically feasible and economically reasonable stocking modes:
High-yield and high-efficiency: The average seed rate is 100-120 kilograms per mu, the fish species gain 6-7 times of weight, the weight gain rate is increased by 30%, the production cost is reduced by 10%-15%, and the incidence and flooding phenomena are also reduced. Reduced risk. These ponds are intensively farmed at the base of scale, and the water source is sufficient and convenient for irrigation and drainage. The aquaculture output can reach 600-700 kg/mu.
Middle-productivity type: This stocking mode is suitable for newly excavated fish culture ponds and places with insufficient bonuses. It is characterized by moderate aquaculture production and 400-500 kilograms per mu, but the benefits are very good. With 60-70 kilograms of fish in the acre, fewer fish species are put in, fast growth, low investment, high utilization of feed and fertilizer, and targeting the advantages of market conditions, and gaining high benefits.
Nesting-based batch stocking type: This model is more suitable for large and medium-sized areas with difficult sources of water and fish. In winter and spring, according to the requirements of planned breeding production, 30% to 40% of the fish stocks are stocked, and in autumn, all the commercial fish are listed. In the summer (mid-June), it is planned to make up for the remaining 60%-70% of the fish species (new seedlings in summer, the cheapest price). This not only solves the problems of insufficient fish species, large expenditure on purchased fish species, and low survival rate, but also transfers funds for saving fish species purchased from abroad to feed, fertilizer, and medicine inputs, and implements intensive feeding to increase fish stocks in the current year. Some of the products that meet the specifications of the product will fall into the winter when they fail to reach the market specifications, and will be listed before and after Qingming in the following year.
80:20 Breeding mode: This mode refers to the cultivation of tropical and subtropical fish (Roofy fishes, freshwater whitefish, etc.), supplemented by service fish (fungus, oysters), spring planting, winter Before the listing, nearly 80% of the production was harvested mainly for fish farming, and 20% was for service fish, which was beneficial to the purification of water quality. 80:20 pond fish, tilapia or freshwater white oysters and other fish production is also very high, usually more than 700-800 kg, plus filter feeding service fish, per mu more than tons. In the acre, there are 1500-1800 tail fish (50 g per tail), 300 tail fish (60 g/tail), and 100 tail fish (60 g/tail).
Stocking ratio: There are no strict rules for stocking and stocking of fish. From the perspective of most economical breeding models, 400 kg per mu of adult fish is used as an example. Its stocking combination is: 450 white plovers, 35.5 kg; é³™ 40 tails, 4 kg; grass carp 60-80 tail, 15-20 kg; carp 20 tails, 1 kg; 50 heads of maggots, 2.5 kg; carp 100 tails, 3 kg; herring 6-8 tails, 4 kg. Although the ratio of high-quality fish is not high, the stocking cost is low, and individual fishes that develop high-quality fish have higher weight gain ratios. This mode can also be changed to the mode of high-quality fish. The number of grass carp is increased to more than 100, the number of head lice is increased to more than 150, and the number of white plover is reduced to 350-400. (Zhang Jinzong)
Reasonable stocking species specifications and carp are the main species for wheel catcher rotation. No matter which type of stocking mode is needed to put it, especially fertilizer ponds, the water body is easily eutrophicated, and the carp filters the phytoplankton effectively. Control algal overgrowth to form harmful blooms. If it is a catch-and-rotate culture mode, 150-200 g/tail large-scale fish species are used as the basis for early catches, and their stocking rate accounts for about 15%. The 50-g/day tail fish species is the main body for the round-listing after the spring release to the end of July, and the launch amount is 65%.
The squid is mainly eaten by zooplankton, and the stocking specification is 100 g/tail, and the input is about 10%.
The herring stocked with 500-700 g/tailed second-instar fish can eat large snails and aquatic insects in the pond, and the amount is 5%.
Grass carp stocking specifications are: 20% of the second-instar/fish species of 400-500g/tail; 40% of 300g/tail; and 20% of grass carp weighing 30-50g in rearing, after one year of rearing Some of them can reach the market specifications, and they can not be used as overwintering species for the second year after they have reached the market specifications.
Catfish stocking specifications should not be too large, generally 30-50 grams / tail can be. Delivered at 5%, it can also be listed before the winter.
The stocking size of C. edulis is 50-75 g/tail, which allows it to develop into a commercial fish for larger individuals. The amount of 10%.
Catfish stocking specifications are about 30 grams/tail, which can save fish species expenditures, and can also achieve higher yields, with 10%.
The stocking size of squid is 30g/tail, which can be used to develop commercial fish of market specifications and stocking capacity of 20%-15%.
The above is based on the biological characteristics of a fish food chain, reasonable specifications and density for the reference of farmers.
The practice of reasonable stocking fish density has proved that the stocking density of fish species is too little, too sparse, and the yield is low and the efficiency is poor; and if the density is too large and exceeds the bearing capacity of the water body, it will cause the dead fish or the individual skinny to reach the market specifications. The following describes several technically feasible and economically reasonable stocking modes:
High-yield and high-efficiency: The average seed rate is 100-120 kilograms per mu, the fish species gain 6-7 times of weight, the weight gain rate is increased by 30%, the production cost is reduced by 10%-15%, and the incidence and flooding phenomena are also reduced. Reduced risk. These ponds are intensively farmed at the base of scale, and the water source is sufficient and convenient for irrigation and drainage. The aquaculture output can reach 600-700 kg/mu.
Middle-productivity type: This stocking mode is suitable for newly excavated fish culture ponds and places with insufficient bonuses. It is characterized by moderate aquaculture production and 400-500 kilograms per mu, but the benefits are very good. With 60-70 kilograms of fish in the acre, fewer fish species are put in, fast growth, low investment, high utilization of feed and fertilizer, and targeting the advantages of market conditions, and gaining high benefits.
Nesting-based batch stocking type: This model is more suitable for large and medium-sized areas with difficult sources of water and fish. In winter and spring, according to the requirements of planned breeding production, 30% to 40% of the fish stocks are stocked, and in autumn, all the commercial fish are listed. In the summer (mid-June), it is planned to make up for the remaining 60%-70% of the fish species (new seedlings in summer, the cheapest price). This not only solves the problems of insufficient fish species, large expenditure on purchased fish species, and low survival rate, but also transfers funds for saving fish species purchased from abroad to feed, fertilizer, and medicine inputs, and implements intensive feeding to increase fish stocks in the current year. Some of the products that meet the specifications of the product will fall into the winter when they fail to reach the market specifications, and will be listed before and after Qingming in the following year.
80:20 Breeding mode: This mode refers to the cultivation of tropical and subtropical fish (Roofy fishes, freshwater whitefish, etc.), supplemented by service fish (fungus, oysters), spring planting, winter Before the listing, nearly 80% of the production was harvested mainly for fish farming, and 20% was for service fish, which was beneficial to the purification of water quality. 80:20 pond fish, tilapia or freshwater white oysters and other fish production is also very high, usually more than 700-800 kg, plus filter feeding service fish, per mu more than tons. In the acre, there are 1500-1800 tail fish (50 g per tail), 300 tail fish (60 g/tail), and 100 tail fish (60 g/tail).
Stocking ratio: There are no strict rules for stocking and stocking of fish. From the perspective of most economical breeding models, 400 kg per mu of adult fish is used as an example. Its stocking combination is: 450 white plovers, 35.5 kg; é³™ 40 tails, 4 kg; grass carp 60-80 tail, 15-20 kg; carp 20 tails, 1 kg; 50 heads of maggots, 2.5 kg; carp 100 tails, 3 kg; herring 6-8 tails, 4 kg. Although the ratio of high-quality fish is not high, the stocking cost is low, and individual fishes that develop high-quality fish have higher weight gain ratios. This mode can also be changed to the mode of high-quality fish. The number of grass carp is increased to more than 100, the number of head lice is increased to more than 150, and the number of white plover is reduced to 350-400. (Zhang Jinzong)
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