Commonly known as the Australian freshwater lobster, also known as the freshwater lobster, it is a large crayfish species with a slightly flat shape, brownish green color, and a membranous red strip at the top of the chelate. It is native to Australia. The shrimp has the advantages of large individual size, high dietary habits, strong adaptability, rapid growth, high yield, strong disease resistance, tender meat, delicious taste, high edible rate, long-distance transport, and fresh listing. The favored freshwater species of freshwater suitable for pond culture are favored by consumers. The current market prospect is very broad, generally priced at around 100 yuan/kg. In order to help the majority of farmers to get rich as soon as possible, according to my unit's aquaculture experiment since 1997, the main points of breeding techniques are described as follows:
1 Shrimp pond construction The shrimp pond should be constructed in a place with good ventilation, quiet environment, convenient drainage and irrigation, and no water pollution. The shrimp pond is preferably rectangular, and the area is generally 2 to 5 mu. The water depth is 1 to 1.5 meters. The bottom of the pond is slightly sloped, which is convenient for drainage and no silt. The soil in the shrimp pond is suitable for sticky, loamy soil and rocky areas, and has good water retention properties. A 50-cm-high anti-escape facility is built around the pool. Inlet and outlet devices filter mesh cloth to prevent intrusion of wild fish and predators.
Water plants (mainly Eichhornia crassipes, water lettuce, water peanuts, etc.) are stored in shallow water areas around the ponds, and their coverage is not less than 1/3 of the surface of the shrimp ponds. Because red-claw crayfish do not have the habit of digging deep holes, the pool bottom must invest a certain amount of artificial stereoscopic concealments, such as waste tires, mesh, PVC pipes, scrap bricks, bamboo rafts, and abandoned poultry troughs, etc. For lobster hidden habitat.
2 Water Quality Requirements The water source is non-polluting and meets the water quality standards for fishery waters. Water temperature 7 °C ~ 37 °C, suitable temperature 20 °C ~ 32 °C, high temperature. Alkaline water quality, PH value of 6.5 ~ 8.5 is good, with traces of salt and a certain total hardness (20 mg / l), resistant to hypoxia, DO greater than 3 mg / liter.
To avoid the pollution of heavy metals, insecticides, herbicides, etc. Shrimp seedlings are particularly sensitive to ammonia and adopt microfluidic water or regular new water aquaculture to keep the water fresh.
3 Clearance of the pond 10 days to 15 days before disinfection, drain the pool water, remove the silt, keep the water depth at 20 cm to 30 cm, use 75 kg to 100 kg of lime per acre, and evenly sprinkle the whole pool to kill the wild fish in the pool. And predator creatures.
4 Bait culture is conducted 7 days to 10 days before planting, 200 kg to 500 kg of decomposed organic fertilizer is put into the shrimp pond per acre, and animal feeds such as “the red worm†are cultivated to ensure adequate puff feed after the shrimp pond.
5 Shrimp seedlings Stocking in rivers and rivers in Zhejiang Province is generally started when the water temperature is stable above 21°C in mid-May. The exact time is sunny or early evening. Wait until the container containing the shrimp seedlings is close to the water temperature in the tank and then put the seedlings. Shrimp seedlings should be put in one foot and the specifications should be neat; different specifications should be strictly controlled. To enlarge the seedlings is good, can improve the survival rate of the pond. Generally, shrimps with a size of 3 cm to 5 cm or a weight of 1 g or more are placed. The stocking density is generally 5000 to 6000 tails per mu. If the size is smaller, the stocking density can be increased appropriately. It is equipped with 150 white mussels per acre, specifications 50g ~ 100g/tail, but can not be used with stocking tilapia.
6 scientific feeding to adhere to the "four definite" feeding principle, feeding as much as possible diversification of species, such as water duckweed, water hyacinth and other aquatic plants, artificial pellet feed, as well as small trash fish, cockroaches, snails and other animal food. Daily feeding is sufficient to eat, eat well, and not leave. Every morning and evening, mainly in the evening, accounting for 70% to 80% of the amount of feed. Especially in the larvae stage, food can not be lacking, and we must invest enough to avoid killing each other. Feeding amount is about 20% of the shrimp body weight in the early period, mainly animal feed, supplemented with some water grass and pellet feed; about 10% to 15% of the shrimp body weight is fed in the middle and later stages, with small trash fish and death. The leftovers of fish and aquatic products, the slaughtered leftovers of livestock and poultry, and crushed maggots and snails are fed with appropriate amount of plant feed and artificial compound feeds. According to the weather, water temperature, water quality, shrimp activities, food intake, and oyster shell, etc., the amount of feed should be determined.
7 Shrimp pool management In the daily management, adhere to each patrol pond in the morning and evening one time, and focus on checking the damage of the strainer and the escape prevention facilities at the inlet and outlet, and timely repair. Remove moss from the pond and enter predators (such as rats, jaundice, frogs, etc.) in time. Observe the growth, activity, feeding, and oyster shells of the lobster, adjust the water quality in time, and increase or decrease the amount of feeding. Add new water in a timely manner, regularly spilled 3010.6 lime into the pool, adjust the PH value, increase the calcium in the pool, improve the water hardness, purify the water, and keep the water fresh.
8 Production and fishing According to the experience, as long as technical measures are in place, management will keep pace, and feed will be sufficient. Generally, after 5 to 6 months of feeding, the size of shrimps can reach 80-200 grams per bean, and the yield is about 400 kg per mu. Fishing is mainly carried out by cage trapping and dry pond fishing. The net cage cage mesh in the cage cage method is 2 cm, and the shape is upright and pyramidal. During the trapping, the bait is placed in a cage and then submerged into the pond. The cage is immediately harvested from the cage and used for 3 months to 4 months after stocking. When the water temperature drops to 16°C, dry ponds must be trapped. There is also a flow trapping method. According to the lobster's retrogressive habits, the guide pipe flows into the trapping device, and the water flow does not exceed 0.5 cubic meters/second. The use of different pond water or well water to form a stream is better than the trapping effect of this pond water.
1 Shrimp pond construction The shrimp pond should be constructed in a place with good ventilation, quiet environment, convenient drainage and irrigation, and no water pollution. The shrimp pond is preferably rectangular, and the area is generally 2 to 5 mu. The water depth is 1 to 1.5 meters. The bottom of the pond is slightly sloped, which is convenient for drainage and no silt. The soil in the shrimp pond is suitable for sticky, loamy soil and rocky areas, and has good water retention properties. A 50-cm-high anti-escape facility is built around the pool. Inlet and outlet devices filter mesh cloth to prevent intrusion of wild fish and predators.
Water plants (mainly Eichhornia crassipes, water lettuce, water peanuts, etc.) are stored in shallow water areas around the ponds, and their coverage is not less than 1/3 of the surface of the shrimp ponds. Because red-claw crayfish do not have the habit of digging deep holes, the pool bottom must invest a certain amount of artificial stereoscopic concealments, such as waste tires, mesh, PVC pipes, scrap bricks, bamboo rafts, and abandoned poultry troughs, etc. For lobster hidden habitat.
2 Water Quality Requirements The water source is non-polluting and meets the water quality standards for fishery waters. Water temperature 7 °C ~ 37 °C, suitable temperature 20 °C ~ 32 °C, high temperature. Alkaline water quality, PH value of 6.5 ~ 8.5 is good, with traces of salt and a certain total hardness (20 mg / l), resistant to hypoxia, DO greater than 3 mg / liter.
To avoid the pollution of heavy metals, insecticides, herbicides, etc. Shrimp seedlings are particularly sensitive to ammonia and adopt microfluidic water or regular new water aquaculture to keep the water fresh.
3 Clearance of the pond 10 days to 15 days before disinfection, drain the pool water, remove the silt, keep the water depth at 20 cm to 30 cm, use 75 kg to 100 kg of lime per acre, and evenly sprinkle the whole pool to kill the wild fish in the pool. And predator creatures.
4 Bait culture is conducted 7 days to 10 days before planting, 200 kg to 500 kg of decomposed organic fertilizer is put into the shrimp pond per acre, and animal feeds such as “the red worm†are cultivated to ensure adequate puff feed after the shrimp pond.
5 Shrimp seedlings Stocking in rivers and rivers in Zhejiang Province is generally started when the water temperature is stable above 21°C in mid-May. The exact time is sunny or early evening. Wait until the container containing the shrimp seedlings is close to the water temperature in the tank and then put the seedlings. Shrimp seedlings should be put in one foot and the specifications should be neat; different specifications should be strictly controlled. To enlarge the seedlings is good, can improve the survival rate of the pond. Generally, shrimps with a size of 3 cm to 5 cm or a weight of 1 g or more are placed. The stocking density is generally 5000 to 6000 tails per mu. If the size is smaller, the stocking density can be increased appropriately. It is equipped with 150 white mussels per acre, specifications 50g ~ 100g/tail, but can not be used with stocking tilapia.
6 scientific feeding to adhere to the "four definite" feeding principle, feeding as much as possible diversification of species, such as water duckweed, water hyacinth and other aquatic plants, artificial pellet feed, as well as small trash fish, cockroaches, snails and other animal food. Daily feeding is sufficient to eat, eat well, and not leave. Every morning and evening, mainly in the evening, accounting for 70% to 80% of the amount of feed. Especially in the larvae stage, food can not be lacking, and we must invest enough to avoid killing each other. Feeding amount is about 20% of the shrimp body weight in the early period, mainly animal feed, supplemented with some water grass and pellet feed; about 10% to 15% of the shrimp body weight is fed in the middle and later stages, with small trash fish and death. The leftovers of fish and aquatic products, the slaughtered leftovers of livestock and poultry, and crushed maggots and snails are fed with appropriate amount of plant feed and artificial compound feeds. According to the weather, water temperature, water quality, shrimp activities, food intake, and oyster shell, etc., the amount of feed should be determined.
7 Shrimp pool management In the daily management, adhere to each patrol pond in the morning and evening one time, and focus on checking the damage of the strainer and the escape prevention facilities at the inlet and outlet, and timely repair. Remove moss from the pond and enter predators (such as rats, jaundice, frogs, etc.) in time. Observe the growth, activity, feeding, and oyster shells of the lobster, adjust the water quality in time, and increase or decrease the amount of feeding. Add new water in a timely manner, regularly spilled 3010.6 lime into the pool, adjust the PH value, increase the calcium in the pool, improve the water hardness, purify the water, and keep the water fresh.
8 Production and fishing According to the experience, as long as technical measures are in place, management will keep pace, and feed will be sufficient. Generally, after 5 to 6 months of feeding, the size of shrimps can reach 80-200 grams per bean, and the yield is about 400 kg per mu. Fishing is mainly carried out by cage trapping and dry pond fishing. The net cage cage mesh in the cage cage method is 2 cm, and the shape is upright and pyramidal. During the trapping, the bait is placed in a cage and then submerged into the pond. The cage is immediately harvested from the cage and used for 3 months to 4 months after stocking. When the water temperature drops to 16°C, dry ponds must be trapped. There is also a flow trapping method. According to the lobster's retrogressive habits, the guide pipe flows into the trapping device, and the water flow does not exceed 0.5 cubic meters/second. The use of different pond water or well water to form a stream is better than the trapping effect of this pond water.
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