There are three modes of pond aquaculture Rochester shrimp, namely, monoculture, shrimp-based shrimp-fish mix and fish-based fish-shrimp mix.
1. Monoculture mode: per hectare stocking specifications for each tail of 0.7 ~ 1.0 cm desalination of 210,000 tails of seedling, culture cycle in more than 150 days, the culture of the survival rate of 50% calculation, can produce specifications for each kg of 56 tails or so of the commercial shrimp of about 1,875 kilograms. Such as stocking specifications for each tail of 2.0 to 3.0 cm of large-size shrimp, per hectare can be put 150,000 tails, the culture cycle of more than 150 days, culture survival rate of 50%, can produce specifications of about 40 tails of adult shrimp per kilogram 2250 kg.
2. shrimp-based shrimp and fish mixed culture mode: this mode of stocking shrimp fry, can also be divided into desalination fry and large-size shrimp two kinds, while the fish to silver and bighead carp 1-year-old fish species is appropriate. Generally per hectare put 0.7 ~ 1.0 cm desalination fry 150,000 or 2.0 ~ 3.0 cm of large-size shrimp 100,000, 20 ~ 30 per kg of bighead carp, bighead carp species 120 (bighead carp, bighead carp ratio of 3: 1), shrimp survival rate of 50% to 60%, fish survival rate of 90%, the breeding cycle of 130 days, the production of specifications of about 50 tails of the Rochester swamp shrimp 1500 kg per kg, and 1500kg silver and bighead carp.
3. fish-based fish and shrimp mixed culture mode: this mode of stocking fish to the year the summer flower fish species is appropriate, not to stock ferocious eating fish, and shrimp should be put as little as possible to compete with the fish; shrimp can also be stocked with two specifications. To produce 600 kg of shrimp per hectare, for example, usually stocked per 0.7 ~ 1.0 cm desalination fry 72,000 tails or 2.0 ~ 3.0 cm of large-size baby shrimp 45,000 tails, 187,500 tails of summer flowers, shrimp survival rate of 50% to 60%, the survival rate of 60% of the fish, the breeding cycle of 130 days, the production of specifications for the shrimp of 45-60 tails of 600 kg, specifications for the shrimp of 45-60 tails of 600 kg, specifications for the fish species of about 6,000 tails of 18 tails of every kilogram. 6,000 kilograms of fish species with specifications of about 18 tails per kilogram.
4. Rochester shrimp fry stocking precautions
(1) shrimp fry officially stocked before the water test. Water test method is to set up a small net box in the shrimp pond, the second is to use a bucket to fill some pool water, into the shrimp, after half an hour of observation, shrimp activity is normal, confirmed that the toxicity of the pool water has disappeared, before stocking large quantities of shrimp seedlings.
(2) do fertilize the pond, pond water transparency in 35 ~ 40 cm, the pond water is yellowish green or reddish brown, rich in plankton, to ensure that shrimp seedlings have sufficient natural bait.
(3) should choose good weather stocking shrimp seedlings, to avoid drastic changes in the environment on the shrimp seedlings damage.
(4) after long-distance transportation of shrimp fry to pay attention to the water temperature of the plastic bag filled with shrimp and pond water temperature temperature difference between the plastic bag can be placed on the water, to be basically the same temperature of the two water before the shrimp fry into the pool.
(5) release should be in the shrimp pond at the windward end of the seedling operation should be gentle.
(6) Shrimp fry should be accurately counted when they are placed in the pond.