In addition to the input of pollution-free fish and feed, the key link is the prevention and control of fish diseases. Here are some specific practices described below.
Symbiotic environment studies have found that aquatic plants and fish coexist in the same pool, and fish rarely get sick. This has found a breakthrough for the prevention and control of pollution-free fish diseases.
In fish ponds, most of the aquatic plants are rice or lotus root. The specific requirements are - east-west direction, the line spacing should be about 33 cm wide, accounting for no more than 50% of the total area of ​​the water body, so that the light effect is good, the water depth should be based on the water resistance of aquatic plants. The water depth of rice is generally within 30 cm, and the water depth of lotus root is generally more than 50 cm. Farmed fish is a common and famous new breed. Breeding methods can be seedling breeding, adult fish culture. Residues of bait, fish, etc. are deposited in the bottom of the pool and fermented and rotted. Not only do they pollute the water, but they are also prone to harmful pathogens. However, aquatic plants can absorb this as fertilizer, eliminating the breeding grounds for pathogens, and thus have a low incidence of fish.
In the newly-cultivated fish ponds that are planted and reared, there are few pathogens that are susceptible to fish in the environment, so fish diseases rarely occur, while the old fish ponds, on the contrary, are susceptible to disease. Therefore, when building a fish pond, more than one fish pond should be built. This year, fish is kept in this fish pond, another fish pond is planted, and it is exchanged for the second year. Since fish's susceptible pathogens do not infect plants, plant-susceptible pathogens do not infect fish, and thus rotations of planting and breeding reduce each other's occurrence of diseases.
There are many herbs on the slopes, streams, and roadsides of Chinese herbs. Such as pine needles, eucalyptus leaves, willow leaves, buckwheat leaves, water calamus, gall and so on. When there are dead fish floating on the surface of the fish pond, and the non-weather-causing fishes suddenly stop feeding, when the fish swims alone, they can collect or regularly collect the above-mentioned Chinese herbal medicines, cut the collected Chinese herbal medicines into small pieces, and put them into pots to add clean water. After the water is depleted and the water is good, 15-30 kilograms per mu, even the slag splashes into the pool. After 12 hours, the water color turns brown, but it is non-toxic and harmless to fish and water. This will quickly control potential fish diseases and also prevent the occurrence of fish diseases.
In practice, the ecosystem finds that in the fish pond ecosystem, if more and more biological species are involved, the more ecological system is more robust, the stronger the disease resistance of the system is.
If there are few breeds in the fish pond, the proportion of a single species is more than 50%, and the breed is often susceptible to illness. Therefore, more species should be cultured. Grass carp, carp, carp, bigmouth bass, black mullet, whitefish, Chinese sturgeon, turtle, squid, and unavoidable wild fish, snails, and oysters coexist in the same pool. Each species has a different niche and forms a complex food chain. relationship. Eel and squid find the bottom of the excavation pool and destroy the prone environment of the diseased body. The diseased fish are eaten by carnivorous fish due to sluggishness, cutting off the route of transmission of pathogens, and the ecological system automatically prevents disease, resulting in low incidence of fish ponds.
After many years of observation and control, the fish ponds and their surroundings have more fleas, and fish in the pond are less likely to get sick.
The analysis suggests that earthworms can inhibit and kill pool pathogens. In a fish pond that is not easy to escape, the fish can be caught directly, and the easy-to-run fish ponds can be put in bamboo baskets or net bags. The position is better at the inlet, and there should be more than 5 fish ponds per mu. Circling crickets, preferably released after 3 days, to avoid death. After 2-3 years of catching fish to prevent fish diseases and releasing them again, the ponds and their surroundings will increase year by year, naturally preventing fishpond disease from occurring. Shaozhu related links drug residues and drug withdrawal period
The so-called drug residue, that is, the prototype compound of fish drug and its metabolites remaining in any edible portion of the aquatic product, includes impurities related to the drug body. The “Limits for Fish Residues in Pollution-free Foods and Aquatic Products (ny5070-2002)†stipulates that chloramphenicol, furazolidone, ethylene-estradiol, olaquindox, chlortetracycline, oxytetracycline, tetracycline, and sulfonamides must not be detected in aquatic products. And synergists (iodopyrimidine, sulfonyl pyrimidine, etc. based on total amount) allow the highest concentration on the surface or inside of aquatic products to be 100 μg/kg. At the same time, it is important to pay attention to the withdrawal period, that is, the shortest period of time from the last day of drug administration to the date when aquatic products are marketed as food. Such as the withdrawal period of some commonly used drugs: bleaching powder ≥ 5 days; sodium dichloroisocyanurate, trichloroisocyanuric acid, chlorine dioxide ≥ 10 days; oxytetracycline ≥ 30 days (sputum) ≥ 21 days (carp); Oral oxolinic acid ≥ 25 days (鳗鲡) ≥ 21 days (catfish, sweetfish) ≥ 16 days (other fish); sulfa oxyprine ≥ 37 days (bismuth); florfenicol ≥ 7 days (bismuth).
Symbiotic environment studies have found that aquatic plants and fish coexist in the same pool, and fish rarely get sick. This has found a breakthrough for the prevention and control of pollution-free fish diseases.
In fish ponds, most of the aquatic plants are rice or lotus root. The specific requirements are - east-west direction, the line spacing should be about 33 cm wide, accounting for no more than 50% of the total area of ​​the water body, so that the light effect is good, the water depth should be based on the water resistance of aquatic plants. The water depth of rice is generally within 30 cm, and the water depth of lotus root is generally more than 50 cm. Farmed fish is a common and famous new breed. Breeding methods can be seedling breeding, adult fish culture. Residues of bait, fish, etc. are deposited in the bottom of the pool and fermented and rotted. Not only do they pollute the water, but they are also prone to harmful pathogens. However, aquatic plants can absorb this as fertilizer, eliminating the breeding grounds for pathogens, and thus have a low incidence of fish.
In the newly-cultivated fish ponds that are planted and reared, there are few pathogens that are susceptible to fish in the environment, so fish diseases rarely occur, while the old fish ponds, on the contrary, are susceptible to disease. Therefore, when building a fish pond, more than one fish pond should be built. This year, fish is kept in this fish pond, another fish pond is planted, and it is exchanged for the second year. Since fish's susceptible pathogens do not infect plants, plant-susceptible pathogens do not infect fish, and thus rotations of planting and breeding reduce each other's occurrence of diseases.
There are many herbs on the slopes, streams, and roadsides of Chinese herbs. Such as pine needles, eucalyptus leaves, willow leaves, buckwheat leaves, water calamus, gall and so on. When there are dead fish floating on the surface of the fish pond, and the non-weather-causing fishes suddenly stop feeding, when the fish swims alone, they can collect or regularly collect the above-mentioned Chinese herbal medicines, cut the collected Chinese herbal medicines into small pieces, and put them into pots to add clean water. After the water is depleted and the water is good, 15-30 kilograms per mu, even the slag splashes into the pool. After 12 hours, the water color turns brown, but it is non-toxic and harmless to fish and water. This will quickly control potential fish diseases and also prevent the occurrence of fish diseases.
In practice, the ecosystem finds that in the fish pond ecosystem, if more and more biological species are involved, the more ecological system is more robust, the stronger the disease resistance of the system is.
If there are few breeds in the fish pond, the proportion of a single species is more than 50%, and the breed is often susceptible to illness. Therefore, more species should be cultured. Grass carp, carp, carp, bigmouth bass, black mullet, whitefish, Chinese sturgeon, turtle, squid, and unavoidable wild fish, snails, and oysters coexist in the same pool. Each species has a different niche and forms a complex food chain. relationship. Eel and squid find the bottom of the excavation pool and destroy the prone environment of the diseased body. The diseased fish are eaten by carnivorous fish due to sluggishness, cutting off the route of transmission of pathogens, and the ecological system automatically prevents disease, resulting in low incidence of fish ponds.
After many years of observation and control, the fish ponds and their surroundings have more fleas, and fish in the pond are less likely to get sick.
The analysis suggests that earthworms can inhibit and kill pool pathogens. In a fish pond that is not easy to escape, the fish can be caught directly, and the easy-to-run fish ponds can be put in bamboo baskets or net bags. The position is better at the inlet, and there should be more than 5 fish ponds per mu. Circling crickets, preferably released after 3 days, to avoid death. After 2-3 years of catching fish to prevent fish diseases and releasing them again, the ponds and their surroundings will increase year by year, naturally preventing fishpond disease from occurring. Shaozhu related links drug residues and drug withdrawal period
The so-called drug residue, that is, the prototype compound of fish drug and its metabolites remaining in any edible portion of the aquatic product, includes impurities related to the drug body. The “Limits for Fish Residues in Pollution-free Foods and Aquatic Products (ny5070-2002)†stipulates that chloramphenicol, furazolidone, ethylene-estradiol, olaquindox, chlortetracycline, oxytetracycline, tetracycline, and sulfonamides must not be detected in aquatic products. And synergists (iodopyrimidine, sulfonyl pyrimidine, etc. based on total amount) allow the highest concentration on the surface or inside of aquatic products to be 100 μg/kg. At the same time, it is important to pay attention to the withdrawal period, that is, the shortest period of time from the last day of drug administration to the date when aquatic products are marketed as food. Such as the withdrawal period of some commonly used drugs: bleaching powder ≥ 5 days; sodium dichloroisocyanurate, trichloroisocyanuric acid, chlorine dioxide ≥ 10 days; oxytetracycline ≥ 30 days (sputum) ≥ 21 days (carp); Oral oxolinic acid ≥ 25 days (鳗鲡) ≥ 21 days (catfish, sweetfish) ≥ 16 days (other fish); sulfa oxyprine ≥ 37 days (bismuth); florfenicol ≥ 7 days (bismuth).
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