Every year before and after the lunar calendar frost falls, mature river crabs in the middle of rivers will descend downstream and reach the rivers to spawn and breed. By the second spring, the descendants of the river will follow the steps of their ancestors. On the way, look for the feeding site in the river until it grows and matures. Using this genital migratory habit of river crabs, it is possible to artificially store crabs in natural rivers. Zhenghe County of Fujian Province is located in the mountainous area. There are many river channels in the area. Since the river channel stocking was started in 1993, certain effects have been achieved and the economic benefits have been obvious. The specific practices are summarized as follows:
1. Channel selection: The rivers that store the crabs should choose rivers with good water quality, no pollution in the upstream, little drop in the rivers, and a certain amount of water flow, more tributaries, and more paddy fields on both banks. Because the growth of crabs requires high water quality, contaminated water and smaller rivers are not conducive to the growth of crabs. The rivers are too large for inconvenient fishing and production, and the rate of recovery is low, affecting economic efficiency. Generally, there is a certain amount of flow in the main river. The narrowest point should reach 30m, and the maximum width should not exceed 100m. It is best to stock up to 15km to 20km in the river section. Tributaries and rivers with more paddy fields on both sides of the river can provide more space for crabs and sources of feed. At the same time, it is also beneficial for river crabs to avoid the effects of floods, provide habitats during the flood season, and increase the survival rate. If both sides of the river are mountains and the water quality is lean and the water is rushing, it is not suitable for stocking crabs. In addition, excessive stocking of the middle power station in the river section is not suitable for stocking crabs. The power generation water wheel pump will directly damage the daily activities and the crabs that have migrated, affecting the catch rate.
Second, seed delivery: According to the source of seedlings and economic conditions, there are generally two ways of delivery. The first is to directly put in a standard of 150/kg to 200/kg of crab dung at the end of the year, after nearly one year of feeding, and to capture at the end of the second year. The characteristics of this stocking method are: short time, high survival rate of cast seedlings, production guarantee, quick effect, but high cost. Another method is to directly feed bigeye larvae or bean crabs from May to June each year. After about a year and a half of time, they will be stocked and harvested at the end of the second year. This type of stocking method is characterized by relatively low seed prices and low investment, but often results in lower seedling survival rates and poor seedling health due to transportation and other reasons. , thereby affecting investment efficiency. At present, most farmers adopt a combination of the above two methods of seedlings, that is, putting a few seedlings at the beginning of summer and the end of winter, in order to ensure the creation of the best state of production. In addition, we must deal with the state when the seedlings are in the water. The specific approach is: Select the water flow gently, put more plants in place, and after the arrival of the seedlings, unwrap the packaging and place each bag of seeds in a place away from direct sunlight. 10 minutes to 20 minutes, then put in water, soak for 2 minutes to 3 minutes, place for another 10 minutes, then dip for 2 minutes to 3 minutes, and repeat this 2 or 3 times. Spread the seed into the water and spread quickly. Open better. If the seedlings are placed in the water and climbed on the shore, it means that the difference in temperature treatment is not good and will affect the survival rate of seedlings.
3. Daily management: rivers and river crabs do not have daily feed for daily use. However, the management work is still important. The key to breeding failures is to strengthen the fishery management of the rivers in order to prevent the destruction of river resources by electricity, poison and fish fry, and to the upper reaches. Prevention of pollution accidents that may occur in river sections. Regularly organize personnel to carry out patrolling the river to protect the river, especially in the fishing season, but also to prevent the occurrence of stealing and robbing incidents to ensure the smooth progress of production.
Fourth, fishing methods: autumn wind ring, crab feet itch, each year in the autumn after the lunar calendar, some gonadal mature crabs began to swim in the river, formed a certain scale in cold dew, peak before and after the frost, the most obvious feature is the weather frost The harvesting yield is large. Therefore, it is the harvesting season for crabs every year. There are many specific fishing methods, such as the use of three-tiered gill nets, shrimp cages, crab cages, fixed nets and other methods for fishing. Here, we will focus on a method for crabs in mountainous rivers. Specifically, we will select a point at the very end of the entire river section where the water depth is less than 1m, where the water flow is gentle, and a stake is laid every 3m to 5m in the horizontal direction, and then used. Mesh size is 4cm, height is 1.2m ~ 1.8m of polyethylene or polyvinyl chloride block, set on the wooden stakes will be horizontally blocked the river, and the bottom class buried underground. When it was dark, it was blocked, and the upper part was hung above the stakes to form a block. When the river crabs descended, the passage was blocked and stopped. At this time, only one or two people wanted to stop walking around the block. The use of lighting equipment into the water and hand-dip net can capture the crabs at the bottom of the net.
1. Channel selection: The rivers that store the crabs should choose rivers with good water quality, no pollution in the upstream, little drop in the rivers, and a certain amount of water flow, more tributaries, and more paddy fields on both banks. Because the growth of crabs requires high water quality, contaminated water and smaller rivers are not conducive to the growth of crabs. The rivers are too large for inconvenient fishing and production, and the rate of recovery is low, affecting economic efficiency. Generally, there is a certain amount of flow in the main river. The narrowest point should reach 30m, and the maximum width should not exceed 100m. It is best to stock up to 15km to 20km in the river section. Tributaries and rivers with more paddy fields on both sides of the river can provide more space for crabs and sources of feed. At the same time, it is also beneficial for river crabs to avoid the effects of floods, provide habitats during the flood season, and increase the survival rate. If both sides of the river are mountains and the water quality is lean and the water is rushing, it is not suitable for stocking crabs. In addition, excessive stocking of the middle power station in the river section is not suitable for stocking crabs. The power generation water wheel pump will directly damage the daily activities and the crabs that have migrated, affecting the catch rate.
Second, seed delivery: According to the source of seedlings and economic conditions, there are generally two ways of delivery. The first is to directly put in a standard of 150/kg to 200/kg of crab dung at the end of the year, after nearly one year of feeding, and to capture at the end of the second year. The characteristics of this stocking method are: short time, high survival rate of cast seedlings, production guarantee, quick effect, but high cost. Another method is to directly feed bigeye larvae or bean crabs from May to June each year. After about a year and a half of time, they will be stocked and harvested at the end of the second year. This type of stocking method is characterized by relatively low seed prices and low investment, but often results in lower seedling survival rates and poor seedling health due to transportation and other reasons. , thereby affecting investment efficiency. At present, most farmers adopt a combination of the above two methods of seedlings, that is, putting a few seedlings at the beginning of summer and the end of winter, in order to ensure the creation of the best state of production. In addition, we must deal with the state when the seedlings are in the water. The specific approach is: Select the water flow gently, put more plants in place, and after the arrival of the seedlings, unwrap the packaging and place each bag of seeds in a place away from direct sunlight. 10 minutes to 20 minutes, then put in water, soak for 2 minutes to 3 minutes, place for another 10 minutes, then dip for 2 minutes to 3 minutes, and repeat this 2 or 3 times. Spread the seed into the water and spread quickly. Open better. If the seedlings are placed in the water and climbed on the shore, it means that the difference in temperature treatment is not good and will affect the survival rate of seedlings.
3. Daily management: rivers and river crabs do not have daily feed for daily use. However, the management work is still important. The key to breeding failures is to strengthen the fishery management of the rivers in order to prevent the destruction of river resources by electricity, poison and fish fry, and to the upper reaches. Prevention of pollution accidents that may occur in river sections. Regularly organize personnel to carry out patrolling the river to protect the river, especially in the fishing season, but also to prevent the occurrence of stealing and robbing incidents to ensure the smooth progress of production.
Fourth, fishing methods: autumn wind ring, crab feet itch, each year in the autumn after the lunar calendar, some gonadal mature crabs began to swim in the river, formed a certain scale in cold dew, peak before and after the frost, the most obvious feature is the weather frost The harvesting yield is large. Therefore, it is the harvesting season for crabs every year. There are many specific fishing methods, such as the use of three-tiered gill nets, shrimp cages, crab cages, fixed nets and other methods for fishing. Here, we will focus on a method for crabs in mountainous rivers. Specifically, we will select a point at the very end of the entire river section where the water depth is less than 1m, where the water flow is gentle, and a stake is laid every 3m to 5m in the horizontal direction, and then used. Mesh size is 4cm, height is 1.2m ~ 1.8m of polyethylene or polyvinyl chloride block, set on the wooden stakes will be horizontally blocked the river, and the bottom class buried underground. When it was dark, it was blocked, and the upper part was hung above the stakes to form a block. When the river crabs descended, the passage was blocked and stopped. At this time, only one or two people wanted to stop walking around the block. The use of lighting equipment into the water and hand-dip net can capture the crabs at the bottom of the net.
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