Long-term high temperature and no-rain weather will cause a wide range of changes in the ecological environment of fish-breeding water bodies, which will have a direct or indirect impact on the survival of fish. Therefore, appropriate measures are very important.
Fishes are hypothermic animals, and body temperature changes with changes in water temperature. Water temperature directly affects the survival and growth of fish. Fish is divided into tropical fish, warm-water fish and cold-water fish according to the temperature range, and is divided into wide-temperature fish and narrow-temperature fish according to the scope of adaptation. In China, the majority of fish are cultured in temperate waters.
The optimal temperature range for growth of grasshoppers, grasses, cockroaches, cockroaches, and squids is 15-32°C, and the optimum water temperature for growth is 20-28°C. Above or below the appropriate temperature will affect the growth and survival of fish. The optimum water temperature for tilapia is 28-32°C, and the optimum water temperature for tilapia is 28-30°C. When the water temperature is higher than the upper limit of the optimal water temperature, the appetite of the fish will be reduced or not eaten. The water level of fish ponds with little or no water will drop sharply, and the level of leaking fish ponds will decline even more. Some fish farming water bodies also undertake water supply tasks (such as irrigating farmland), and the water level drops dramatically. The fish's living space is greatly reduced.
Due to the high temperature and strong evaporation, the relative concentration of chemical factors in fish farming water increases rapidly, and some of the harmful chemical factors are even more active. Some even directly poisoned farmed fish.
Hypoxia, especially at night or in the wee hours. Hypoxia directly leads to fish floating heads and pans. In the absence of oxygen: A, ammonia nitrogen will accumulate, when it reaches a certain concentration, it will make fish poison, reduce feeding, slow growth, high concentrations will cause fish to die. B. Nitrite is produced by oxidation of ammonia by bacteria. The presence of nitrite is directly toxic to fish. Ponds with high levels of organic matter in water can easily cause nitrite levels to rise. C. Sulfur-containing organic matter is formed by the decomposition of anaerobic bacteria, or in sulfate-rich water, under the action of sulphate bacteria, turns sulfate into sulfide, and then produces hydrogen sulfide. Hydrogen sulfide often appears to die. fish. These factors interact with each other, leading to fish feeding, poor growth, floating heads, flooding ponds, and frequent diseases.
In this case, a considerable number of farmers do not feed. It seems that feed is a highly toxic drug. In fact, the most essential reason is the sudden outbreak of fish in the harsh ecological environment.
What technical measures can be used to mitigate or eliminate the adverse effects caused by prolonged periods of high temperature and no rain?
Thoroughly change the water and often add new water. Use groundwater to add cooling. If there is less groundwater, local cooling around the feeding station may also be possible. It is also possible to locally set up shade nets in the area where fish are fed in front of the bait-feeding platform to provide local cooling.
Reduce the number of feedings and the amount of feeding. Don't be too late to feed the last time.
Quan Chi launched water purification substances. Extend the aerator time at noon on sunny days. Pay attention to the examination, prevention and treatment of fish diseases.
Strengthen the morning and evening patrol ponds and handle the situation promptly.
Fishes are hypothermic animals, and body temperature changes with changes in water temperature. Water temperature directly affects the survival and growth of fish. Fish is divided into tropical fish, warm-water fish and cold-water fish according to the temperature range, and is divided into wide-temperature fish and narrow-temperature fish according to the scope of adaptation. In China, the majority of fish are cultured in temperate waters.
The optimal temperature range for growth of grasshoppers, grasses, cockroaches, cockroaches, and squids is 15-32°C, and the optimum water temperature for growth is 20-28°C. Above or below the appropriate temperature will affect the growth and survival of fish. The optimum water temperature for tilapia is 28-32°C, and the optimum water temperature for tilapia is 28-30°C. When the water temperature is higher than the upper limit of the optimal water temperature, the appetite of the fish will be reduced or not eaten. The water level of fish ponds with little or no water will drop sharply, and the level of leaking fish ponds will decline even more. Some fish farming water bodies also undertake water supply tasks (such as irrigating farmland), and the water level drops dramatically. The fish's living space is greatly reduced.
Due to the high temperature and strong evaporation, the relative concentration of chemical factors in fish farming water increases rapidly, and some of the harmful chemical factors are even more active. Some even directly poisoned farmed fish.
Hypoxia, especially at night or in the wee hours. Hypoxia directly leads to fish floating heads and pans. In the absence of oxygen: A, ammonia nitrogen will accumulate, when it reaches a certain concentration, it will make fish poison, reduce feeding, slow growth, high concentrations will cause fish to die. B. Nitrite is produced by oxidation of ammonia by bacteria. The presence of nitrite is directly toxic to fish. Ponds with high levels of organic matter in water can easily cause nitrite levels to rise. C. Sulfur-containing organic matter is formed by the decomposition of anaerobic bacteria, or in sulfate-rich water, under the action of sulphate bacteria, turns sulfate into sulfide, and then produces hydrogen sulfide. Hydrogen sulfide often appears to die. fish. These factors interact with each other, leading to fish feeding, poor growth, floating heads, flooding ponds, and frequent diseases.
In this case, a considerable number of farmers do not feed. It seems that feed is a highly toxic drug. In fact, the most essential reason is the sudden outbreak of fish in the harsh ecological environment.
What technical measures can be used to mitigate or eliminate the adverse effects caused by prolonged periods of high temperature and no rain?
Thoroughly change the water and often add new water. Use groundwater to add cooling. If there is less groundwater, local cooling around the feeding station may also be possible. It is also possible to locally set up shade nets in the area where fish are fed in front of the bait-feeding platform to provide local cooling.
Reduce the number of feedings and the amount of feeding. Don't be too late to feed the last time.
Quan Chi launched water purification substances. Extend the aerator time at noon on sunny days. Pay attention to the examination, prevention and treatment of fish diseases.
Strengthen the morning and evening patrol ponds and handle the situation promptly.
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