The Songjiang River is known as the Four-Stork in Shanghai, Jiangsu and Zhejiang Provinces. Although its individual is small, the meat is delicate, white and delicious. It is known as the "China's largest dish" in history. It uses special products from the Songjiang River, such as the "Iriso" and chicken soup, ham, mushrooms, bamboo shoots, shrimps, and other sauces, in the hot pot. Cooking, the taste is fresh and plump, long-term cooking is not old, the taster said unforgettable life. Therefore, researching and developing the breeding of Songjiang oysters has important economic significance.
First, the pond condition pool can use concrete pool or hard bottom soil pool, in the pool bottom or pool wall placement of some bamboo, or with bricks, tiles, etc. Piled into a cave to adapt to Songjiang, during the day in the dark, out at night The characteristics of food activities. The shape of the pond is preferably rectangular. The ratio of length to width is 2:1. The slope of the pond can be larger. The bottom of the pond should be even and slightly sloped, which will help drain the pool water. The pool area should not be too large, generally ranging from 300 square meters to 700 square meters, with a water depth of no more than 1 meter. The water quality of the water source is better. The fish pond should be close to the water source. The water source must be live water. It cannot be stagnant water. The circulating water is the best.
Second, fish fry pond pool after disinfection of drug fish, must wait until the disappearance of drug toxicity before they can be placed in fry. For the fry of the fry, 300 square meters is good, and generally about 5,000 fish from Songjiang can be stocked. Before putting the fry, base fertilizers such as manure and green manure should be applied in the pool. After the fish pond water quality is changed, a certain amount of freshwater prawn can be put into it, so that it can breed larvae and serve as bait for Songjiang oysters. After the Songjiang carp seedlings are put into the fishpond, they should be reared by means of culturing puffer fish and squid species so that the water is rich in zooplankton, but the water quality must not be the same as that of carp and carp species. It is necessary to control the shrimp in the water. In the early hours of the morning, it is not due to lack of oxygen and the floating head will prevail. In general, the dissolved oxygen in water should be kept above 5 mg/L. The time for the stocking of Songjiang eel fry can be carried out from the end of April to the end of May. The fry can be raised temporarily from the coastal shallow sea and the sluice near the river, and it should be maintained for one and a half months. Until adult fish.
Third, adult fish rearing fish pond size is generally about 700 square meters is good, can be divided into single and polyculture two. About 700 square meters of a single fish pond can be placed around 1000 species of summer fish, ponds should put some appropriate fertilizer, often fed live shrimp, small benthic fish or live fly maggots. Mixed fish ponds generally have poor results and should not be promoted. Must pay attention to polyculture of fish species, which is suitable for polyculture with grass carp and carp, but not polyculture with carp, carp, or broodstock.
IV. Daily Management The living conditions of Songjiang River are extremely high, and the requirements for the ecological environment are different from those for home fish. Therefore, daily feeding and management are particularly important. The focus of day-to-day management work is: Every morning, evening and night, it is necessary to visit the pond and take timely measures according to various situations. Check whether there is a floating head phenomenon at dawn every day; if there is a lack of oxygen in the shrimps and small fish in Songjiang River, whether the sick fish or dead fish are fished out in time. Check for signs of floating heads near dusk to ensure night safety. Especially in the hot summer season, the weather must be abrupt, hot, windy, cloudy, or before and after the rain. It is imperative to strengthen the patrol ponds before and after the rain, grasp the fish condition, inject fresh water frequently, maintain good water quality, and do a good job of preventing flight and preventing diseases.
Fifth, fish disease prevention
1. In the early stages of the onset of white cutaneous symptoms, some white dots appeared at the caudal peduncle and quickly enlarged, causing the dorsal fin and anal fin lesions to develop from the body surface to the base of the caudal fins, all of which became white and soon died.
The pathogen is Bacillus subtilis, with rod-shaped cells and 1 to 2 flagella at the top.
The onset of disease occurs in both the fingerling and adult fish stages, and the onset time is from June to December.
Preventive measures to keep the pond fresh and fresh, rich and fresh feed. During the fishing operation, try to prevent the fish from being injured. Before the fish is stocked, bathe with (2 to 3) 10-6 mercuric nitrate for about 1 hour. If you find that fish have oxygen deficiency during bathing, you can inflate oxygen.
Treatment method Mercurous nitrate (0.1 ~ 0.2) 10-6 concentration Quanqu splash; "Five gallnuts" (2 ~ 4) 10-6 concentration Quanji splashing.
2. The symptoms of anchor head lice can be seen in the naked eye of the diseased fish. The site where the head of the anchor head penetrates is swollen and inflamed around the head. Especially harmful to fish species is more serious than adult fish. A Songjiang cricket is often carrying 4 to 6 anchor heads. Pathogens are caused by mistletoe on the head of the anchor. Antlerhead borer is more harmful to fish species. The disease can occur all year round. It is more from June to October.
Prevention methods Use quicklime to clear the pond and kill the larvae of the anchored larvae, as well as the fish and pupa with worms. When stocking fish, they should be washed with potassium permanganate at a concentration of (5 to 10) 10-6. After stocking, when the fish pond is filled with new water, let the water flow through the filter to avoid the larvae of the anchor head lice entering the fish pond as the water flows. In order to effectively prevent the disease from occurring.
The treatment method uses potassium permanganate from 80,000 to 1 in 100,000 when the water temperature is above 20°C. The specific event depends on the patience of the fish.
First, the pond condition pool can use concrete pool or hard bottom soil pool, in the pool bottom or pool wall placement of some bamboo, or with bricks, tiles, etc. Piled into a cave to adapt to Songjiang, during the day in the dark, out at night The characteristics of food activities. The shape of the pond is preferably rectangular. The ratio of length to width is 2:1. The slope of the pond can be larger. The bottom of the pond should be even and slightly sloped, which will help drain the pool water. The pool area should not be too large, generally ranging from 300 square meters to 700 square meters, with a water depth of no more than 1 meter. The water quality of the water source is better. The fish pond should be close to the water source. The water source must be live water. It cannot be stagnant water. The circulating water is the best.
Second, fish fry pond pool after disinfection of drug fish, must wait until the disappearance of drug toxicity before they can be placed in fry. For the fry of the fry, 300 square meters is good, and generally about 5,000 fish from Songjiang can be stocked. Before putting the fry, base fertilizers such as manure and green manure should be applied in the pool. After the fish pond water quality is changed, a certain amount of freshwater prawn can be put into it, so that it can breed larvae and serve as bait for Songjiang oysters. After the Songjiang carp seedlings are put into the fishpond, they should be reared by means of culturing puffer fish and squid species so that the water is rich in zooplankton, but the water quality must not be the same as that of carp and carp species. It is necessary to control the shrimp in the water. In the early hours of the morning, it is not due to lack of oxygen and the floating head will prevail. In general, the dissolved oxygen in water should be kept above 5 mg/L. The time for the stocking of Songjiang eel fry can be carried out from the end of April to the end of May. The fry can be raised temporarily from the coastal shallow sea and the sluice near the river, and it should be maintained for one and a half months. Until adult fish.
Third, adult fish rearing fish pond size is generally about 700 square meters is good, can be divided into single and polyculture two. About 700 square meters of a single fish pond can be placed around 1000 species of summer fish, ponds should put some appropriate fertilizer, often fed live shrimp, small benthic fish or live fly maggots. Mixed fish ponds generally have poor results and should not be promoted. Must pay attention to polyculture of fish species, which is suitable for polyculture with grass carp and carp, but not polyculture with carp, carp, or broodstock.
IV. Daily Management The living conditions of Songjiang River are extremely high, and the requirements for the ecological environment are different from those for home fish. Therefore, daily feeding and management are particularly important. The focus of day-to-day management work is: Every morning, evening and night, it is necessary to visit the pond and take timely measures according to various situations. Check whether there is a floating head phenomenon at dawn every day; if there is a lack of oxygen in the shrimps and small fish in Songjiang River, whether the sick fish or dead fish are fished out in time. Check for signs of floating heads near dusk to ensure night safety. Especially in the hot summer season, the weather must be abrupt, hot, windy, cloudy, or before and after the rain. It is imperative to strengthen the patrol ponds before and after the rain, grasp the fish condition, inject fresh water frequently, maintain good water quality, and do a good job of preventing flight and preventing diseases.
Fifth, fish disease prevention
1. In the early stages of the onset of white cutaneous symptoms, some white dots appeared at the caudal peduncle and quickly enlarged, causing the dorsal fin and anal fin lesions to develop from the body surface to the base of the caudal fins, all of which became white and soon died.
The pathogen is Bacillus subtilis, with rod-shaped cells and 1 to 2 flagella at the top.
The onset of disease occurs in both the fingerling and adult fish stages, and the onset time is from June to December.
Preventive measures to keep the pond fresh and fresh, rich and fresh feed. During the fishing operation, try to prevent the fish from being injured. Before the fish is stocked, bathe with (2 to 3) 10-6 mercuric nitrate for about 1 hour. If you find that fish have oxygen deficiency during bathing, you can inflate oxygen.
Treatment method Mercurous nitrate (0.1 ~ 0.2) 10-6 concentration Quanqu splash; "Five gallnuts" (2 ~ 4) 10-6 concentration Quanji splashing.
2. The symptoms of anchor head lice can be seen in the naked eye of the diseased fish. The site where the head of the anchor head penetrates is swollen and inflamed around the head. Especially harmful to fish species is more serious than adult fish. A Songjiang cricket is often carrying 4 to 6 anchor heads. Pathogens are caused by mistletoe on the head of the anchor. Antlerhead borer is more harmful to fish species. The disease can occur all year round. It is more from June to October.
Prevention methods Use quicklime to clear the pond and kill the larvae of the anchored larvae, as well as the fish and pupa with worms. When stocking fish, they should be washed with potassium permanganate at a concentration of (5 to 10) 10-6. After stocking, when the fish pond is filled with new water, let the water flow through the filter to avoid the larvae of the anchor head lice entering the fish pond as the water flows. In order to effectively prevent the disease from occurring.
The treatment method uses potassium permanganate from 80,000 to 1 in 100,000 when the water temperature is above 20°C. The specific event depends on the patience of the fish.
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