There are two types of shrimp farming in Macrobrachium rosenbergii: one is shrimp, and the other is a small amount of polyculture. The purpose of the mixed fish is to control the over-breeding plankton in the pond and increase the amount of plankton. The fish yield; Second, the fish is the right amount of mixed Macrobrachium rosenbergii, can make full use of the fish pond feed, increase shrimp production, improve the production efficiency of the fish pond.
First, the main shrimp, fish and shrimp polyculture:
In general, when shrimp is used as the main species, they are released from -2 to 40,000 kg/mu, and after 5 to 6 months of feeding, the survival rate of the shrimp is 40%, and the average body weight is 15 g or more. Shrimp production can reach 120 ~ 240 kg / mu, and the other harvest 100 ~ 200 kg of commercial fish.
(I) Pond conditions
1, area and depth. Area 1300 ~ 6667 square meters, water depth of about 1.5 meters.
2, pond embankment and sediment. The embankment is strong and leak-proof. The bottom of the pool is flat. Sandy soil is better. The thickness of the mud is 5 to 10 cm.
3, water and water quality. Adequate water supply, drainage and irrigation are convenient. Water quality should meet the requirements of GBI1607.
4, concealment settings. Set necessary hidden objects in the pond, such as planting aquatic plants or hanging nets along the edge of the pond, putting branches, etc. The hidden area is set to 1/5 to 1/4 of the pond area.
5, clear pond disinfection. Before the stocking, clear ponds should be disinfected. When the water depth is 1 meter, use 100-125 kilograms of quick lime or mix lime with 40-50 kilograms of tea bream. When the wild fishes and shrimps swim to the beach, re-use the crystals immediately. After the 0.75 kg of trichlorfon was dissolved, it was splashed along the pond to completely remove the wild fish, shrimps and pathogens. After 7 to 10 days, a small amount of shrimp seedlings tested the water to prove that the toxicity of the drug disappeared before the shrimp can be officially stocked.
(B) Main bred Roche shrimp
1. Shrimp stocking: The young larvae with a body length of 1.5 cm or more and 125,000 to 15,000 larvae after breeding in the middle of the larvae are stocked with 20 to 40 thousand desalinated shrimps with a length of 0.7 cm. The specifications are the same and they are full at one time. When stocking shrimp, the pond water temperature should be stable above 20°C.
2. Stocking of fish: The length of the mixed-cultivation body is 14 to 16 centimeters per mu, and 100 to 150 fishes are prepared. The ratio between the two is 3:1.
(III) Feeding Management
1. Feeding: Feed the compound pellet feed with a crude protein content of 32% or more, and feed other botanical and animal feeds. The daily dosage is 8% to 10% of the total shrimp weight in the shrimp stage (below 3 grams of tail weight), 5% to 8% of the daily shrimp volume (3 to 10 grams of tail weight), and the prawns stage ( Tail weight more than 11 grams) daily amount of 3% to 5%. Daily doses are given in the morning, at noon, and evening in the ratio of 3:3:4. The whole pond was cast and cast in the deep water area during the day, and it turned to the shallow water area at night to cast more.
2, fertilization: clear pond can be released after the base fertilizer, cultivation of water quality, the application of fermented organic fertilizer 50 ~ 100 kg / acre; shrimp fish stocking after the water as the situation changes, the initial stage of the breeding can be fermented organic fertilizer 20 to 50 kilograms, and In the middle and late stages of cultivation, fertilizers such as urea or ammonium bicarbonate are used at 2 to 3 kg/mu to promote the sustained growth and reproduction of plankton and increase natural food.
3. Water quality management: Regularly determine the physicochemical factors of the pool water, and timely flush new water or mechanical oxygen. 2,000 to 3,500 square meters of water is equipped with a 1.5-kilowatt aerator to ensure that the pool's dissolved oxygen is above 4 mg/l. Reserve chemical oxygenation agents to prevent flooding caused by various causes. The transparency of the pool water is maintained at about 25 cm. Use beneficial microbial preparations to improve the water quality and bottom quality of the culture. The water depth in the early stage of cultivation can be 0.8 meters, and the water depth in the middle and later stages is about 1.5 meters.
4. Shrimp inspection: Sampling shrimp growth every two weeks, measuring total length, body length and body weight, and adjusting the feeding amount according to the growth conditions.
5. Disease prevention and control: Diligent patrol ponds, promptly remove enemy organisms in ponds, and regularly sterilize and prevent diseases with quicklime. In the early stage of cultivation, 5kg/mu of lime is used every 10 days, 10kg/mu is used every 10 to 15 days in the middle period, and 15kg/mu is sprayed every 20-30 days in the later stage. During the occurrence of disease, the limestone or trichloroisocyanuric acid should be splashed every other day in the whole pool so that the concentration of the pool water is 2010-6 and 0.410-6, respectively, and a course of treatment is 2 to 3 times. Regular use of beneficial microbial preparations to maintain ecological balance.
(d) Shrimp fishing
1, catch large and stay small: juveniles raised after about 3 months, some shrimp body weight of 15 grams or more, it should be timely fishing, and at the same time will be to achieve the specifications of the fish caught with the implementation of the implementation of catching large and small, there are It is conducive to rearing shrimps in the later period of time to raise their length and increase their yield.
2. Dry pond collecting shrimp: When the water temperature drops to 17～18°C, dry the pond directly to collect the shrimp, drain the fish first, use the net to catch the fish, then use the dense net to catch the shrimp, and finally drain the pool water and put the shrimp all. After the catch.
3. Double season shrimp. This mode of cultivation is generally suitable for combination with the cultivation of shrimp, that is, the first production of Macrobrachium rosenbergii. In mid-May, the stocking body is 2.5-3 cm in length, and the broodstock of M. rosenbergii is 1.5 to 20,000 tails per mu, which is put in 30 days. White fish species 100-200 tail. At the end of August and early September, the harvest amounted to about 150 kg per mu. In September and October, stocking specifications ranged from 2000 to 4000 tails per kilogram of 1.5 to 20,000 shrimp seedlings of the year. In June of the following year, it produced more than 30 kilograms of fresh shrimp and more than 40 kilograms of fish. For example, in 1997, the area of ​​double-season shrimp farming in Wubao Township, Jiangdu City was 1812.7 acres, with an average yield of 109.3 kg of Macrobrachium rosenbergii, 26.9 kg of Macrobrachium nippon, 40.2 kg of food fish, and 3,013 yuan of gross Maori.
Second, to fish, fish and shrimp polyculture:
Fish-dominated ponds are mixed with Macrobrachium rosenbergii. This model is due to the early capture time of Macrobrachium rosenbergii, which is inconsistent with fish and is cumbersome to operate. However, there are successful examples. In polyculture ponds, ground fish such as herring, squid, squid, and other predatory fish such as black fish and squid cannot be stocked.
In the pool of fingerlings of Macrobrachium rosenbergii, the type and amount of fish released per acre can be determined according to needs. Mixed-breed Roche shrimp is about 15,000.
First, the main shrimp, fish and shrimp polyculture:
In general, when shrimp is used as the main species, they are released from -2 to 40,000 kg/mu, and after 5 to 6 months of feeding, the survival rate of the shrimp is 40%, and the average body weight is 15 g or more. Shrimp production can reach 120 ~ 240 kg / mu, and the other harvest 100 ~ 200 kg of commercial fish.
(I) Pond conditions
1, area and depth. Area 1300 ~ 6667 square meters, water depth of about 1.5 meters.
2, pond embankment and sediment. The embankment is strong and leak-proof. The bottom of the pool is flat. Sandy soil is better. The thickness of the mud is 5 to 10 cm.
3, water and water quality. Adequate water supply, drainage and irrigation are convenient. Water quality should meet the requirements of GBI1607.
4, concealment settings. Set necessary hidden objects in the pond, such as planting aquatic plants or hanging nets along the edge of the pond, putting branches, etc. The hidden area is set to 1/5 to 1/4 of the pond area.
5, clear pond disinfection. Before the stocking, clear ponds should be disinfected. When the water depth is 1 meter, use 100-125 kilograms of quick lime or mix lime with 40-50 kilograms of tea bream. When the wild fishes and shrimps swim to the beach, re-use the crystals immediately. After the 0.75 kg of trichlorfon was dissolved, it was splashed along the pond to completely remove the wild fish, shrimps and pathogens. After 7 to 10 days, a small amount of shrimp seedlings tested the water to prove that the toxicity of the drug disappeared before the shrimp can be officially stocked.
(B) Main bred Roche shrimp
1. Shrimp stocking: The young larvae with a body length of 1.5 cm or more and 125,000 to 15,000 larvae after breeding in the middle of the larvae are stocked with 20 to 40 thousand desalinated shrimps with a length of 0.7 cm. The specifications are the same and they are full at one time. When stocking shrimp, the pond water temperature should be stable above 20°C.
2. Stocking of fish: The length of the mixed-cultivation body is 14 to 16 centimeters per mu, and 100 to 150 fishes are prepared. The ratio between the two is 3:1.
(III) Feeding Management
1. Feeding: Feed the compound pellet feed with a crude protein content of 32% or more, and feed other botanical and animal feeds. The daily dosage is 8% to 10% of the total shrimp weight in the shrimp stage (below 3 grams of tail weight), 5% to 8% of the daily shrimp volume (3 to 10 grams of tail weight), and the prawns stage ( Tail weight more than 11 grams) daily amount of 3% to 5%. Daily doses are given in the morning, at noon, and evening in the ratio of 3:3:4. The whole pond was cast and cast in the deep water area during the day, and it turned to the shallow water area at night to cast more.
2, fertilization: clear pond can be released after the base fertilizer, cultivation of water quality, the application of fermented organic fertilizer 50 ~ 100 kg / acre; shrimp fish stocking after the water as the situation changes, the initial stage of the breeding can be fermented organic fertilizer 20 to 50 kilograms, and In the middle and late stages of cultivation, fertilizers such as urea or ammonium bicarbonate are used at 2 to 3 kg/mu to promote the sustained growth and reproduction of plankton and increase natural food.
3. Water quality management: Regularly determine the physicochemical factors of the pool water, and timely flush new water or mechanical oxygen. 2,000 to 3,500 square meters of water is equipped with a 1.5-kilowatt aerator to ensure that the pool's dissolved oxygen is above 4 mg/l. Reserve chemical oxygenation agents to prevent flooding caused by various causes. The transparency of the pool water is maintained at about 25 cm. Use beneficial microbial preparations to improve the water quality and bottom quality of the culture. The water depth in the early stage of cultivation can be 0.8 meters, and the water depth in the middle and later stages is about 1.5 meters.
4. Shrimp inspection: Sampling shrimp growth every two weeks, measuring total length, body length and body weight, and adjusting the feeding amount according to the growth conditions.
5. Disease prevention and control: Diligent patrol ponds, promptly remove enemy organisms in ponds, and regularly sterilize and prevent diseases with quicklime. In the early stage of cultivation, 5kg/mu of lime is used every 10 days, 10kg/mu is used every 10 to 15 days in the middle period, and 15kg/mu is sprayed every 20-30 days in the later stage. During the occurrence of disease, the limestone or trichloroisocyanuric acid should be splashed every other day in the whole pool so that the concentration of the pool water is 2010-6 and 0.410-6, respectively, and a course of treatment is 2 to 3 times. Regular use of beneficial microbial preparations to maintain ecological balance.
(d) Shrimp fishing
1, catch large and stay small: juveniles raised after about 3 months, some shrimp body weight of 15 grams or more, it should be timely fishing, and at the same time will be to achieve the specifications of the fish caught with the implementation of the implementation of catching large and small, there are It is conducive to rearing shrimps in the later period of time to raise their length and increase their yield.
2. Dry pond collecting shrimp: When the water temperature drops to 17～18°C, dry the pond directly to collect the shrimp, drain the fish first, use the net to catch the fish, then use the dense net to catch the shrimp, and finally drain the pool water and put the shrimp all. After the catch.
3. Double season shrimp. This mode of cultivation is generally suitable for combination with the cultivation of shrimp, that is, the first production of Macrobrachium rosenbergii. In mid-May, the stocking body is 2.5-3 cm in length, and the broodstock of M. rosenbergii is 1.5 to 20,000 tails per mu, which is put in 30 days. White fish species 100-200 tail. At the end of August and early September, the harvest amounted to about 150 kg per mu. In September and October, stocking specifications ranged from 2000 to 4000 tails per kilogram of 1.5 to 20,000 shrimp seedlings of the year. In June of the following year, it produced more than 30 kilograms of fresh shrimp and more than 40 kilograms of fish. For example, in 1997, the area of ​​double-season shrimp farming in Wubao Township, Jiangdu City was 1812.7 acres, with an average yield of 109.3 kg of Macrobrachium rosenbergii, 26.9 kg of Macrobrachium nippon, 40.2 kg of food fish, and 3,013 yuan of gross Maori.
Second, to fish, fish and shrimp polyculture:
Fish-dominated ponds are mixed with Macrobrachium rosenbergii. This model is due to the early capture time of Macrobrachium rosenbergii, which is inconsistent with fish and is cumbersome to operate. However, there are successful examples. In polyculture ponds, ground fish such as herring, squid, squid, and other predatory fish such as black fish and squid cannot be stocked.
In the pool of fingerlings of Macrobrachium rosenbergii, the type and amount of fish released per acre can be determined according to needs. Mixed-breed Roche shrimp is about 15,000.
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