In the process of fish farming, the situation of dead fish is inevitably encountered. If it is timely and correctly differentiated from dead fish caused by oxygen deficiency or chemical poisoning caused by pollution, then appropriate remedial measures will be taken to help reduce losses. Farmers can judge dead fish and poisoned dead fish from the following aspects.
Dead fish varieties of different species of fish have different levels of tolerance to hypoxia. When the water body is not extremely deficient in oxygen, some species of fish may die, some species of fish may survive, some breeds have a relatively high mortality rate, and some breeds die. The proportion is relatively low. This is not necessarily the same as when poisoning. Of course, all species will die in the event of extreme hypoxia.
Dead fish season and time Dead fish usually occur in the late spring to early fall when the pressure is relatively low, often in the period from zero to pre-dawn, and very few deaths at other times. The time and season of poisoning dead fish is uncertain.
Individuals with dead-size hypoxic fish usually die first, and the proportion of dead fish is higher than that of small fish. Poisoned dead fish on the contrary, the fish died first, the death rate is higher than the big fish.
The behavior is reflected in the lack of oxygen in the water, the fish is in a floating state, that is, the fish swallow the air in the water and swim along the pool wall. This is totally different from the behaviors of collision and jumping when fish poisoning.
In other aquatic organisms, when dead fish are deprived of oxygen, aquatic animals, turtles, snakes, cockroaches, snails, and other aquatic organisms generally do not die. When this is poisoned with chemical substances, aquatic plants may change color, and there are significant differences in the deaths of other aquatic animals.
Dissolved Oxygen The most obvious indicator of water quality for dead fish is that the dissolved oxygen in the water is very low. This is the most obvious difference in the mortality of dead fish with oxygen deficiency and general chemical poisoning.
Water odor, water color, oxygen-dead fish, the water often emit a sour cabbage taste, musty and odor, water often black, gray, and chemical poisoning when the body smell and color is different.
Dead fish varieties of different species of fish have different levels of tolerance to hypoxia. When the water body is not extremely deficient in oxygen, some species of fish may die, some species of fish may survive, some breeds have a relatively high mortality rate, and some breeds die. The proportion is relatively low. This is not necessarily the same as when poisoning. Of course, all species will die in the event of extreme hypoxia.
Dead fish season and time Dead fish usually occur in the late spring to early fall when the pressure is relatively low, often in the period from zero to pre-dawn, and very few deaths at other times. The time and season of poisoning dead fish is uncertain.
Individuals with dead-size hypoxic fish usually die first, and the proportion of dead fish is higher than that of small fish. Poisoned dead fish on the contrary, the fish died first, the death rate is higher than the big fish.
The behavior is reflected in the lack of oxygen in the water, the fish is in a floating state, that is, the fish swallow the air in the water and swim along the pool wall. This is totally different from the behaviors of collision and jumping when fish poisoning.
In other aquatic organisms, when dead fish are deprived of oxygen, aquatic animals, turtles, snakes, cockroaches, snails, and other aquatic organisms generally do not die. When this is poisoned with chemical substances, aquatic plants may change color, and there are significant differences in the deaths of other aquatic animals.
Dissolved Oxygen The most obvious indicator of water quality for dead fish is that the dissolved oxygen in the water is very low. This is the most obvious difference in the mortality of dead fish with oxygen deficiency and general chemical poisoning.
Water odor, water color, oxygen-dead fish, the water often emit a sour cabbage taste, musty and odor, water often black, gray, and chemical poisoning when the body smell and color is different.
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