Six effective methods to improve the disease resistance of fish
Under the current feeding conditions, it is impossible to eliminate all pathogens. However, in order to control the occurrence of fish disease, we can start with scientific aquaculture management and maintain the ecological balance of aquaculture water to improve the disease resistance of fish. As long as proper measures are taken, we will get twice the result with half the effort.
1. Reasonable mixed culture
Reasonable mixed culture can not only increase the yield per unit area, but also play a certain role in the prevention of fish diseases. As the suitable parasites on different species of fish are not exactly the same, some parasites can only be parasitic on certain fish, while others are not sensitive to them; after mixed culture, the population density of each fish decreases, and the probability of outbreak of infectious diseases will also be reduced. In addition, mixed culture of fish with different active water layers and different feeding habits can make full use of the ecological space and various food organisms and nutrients of the culture water body, reduce the content of organic suspended matter in the culture water body, and maintain the ecological balance of the culture water body. Reduce the chance of fish disease.
Second, early stocking
Implement early stocking, changing spring stocking to autumn, winter or early spring. In autumn and winter, the water temperature is low, the vitality of fish species is weak, it is easy to catch and transport, and it is not easy to be injured and infected with diseases. Early stocking can also make fish adapt to the new environment earlier, and the disease epidemic season after the rise of water temperature in spring has restored its physique, started feeding, enhanced disease resistance, and prolonged the growth period.
Third, to achieve the "four fixed" feeding
1. Quality: feed should be fresh, nutritionally balanced, free of pathogens and toxic substances, and not rotten.
two。 Ration: feed appropriately according to the size and type of fish. The amount of feeding should be determined according to the season, weather conditions, the degree of fat and thin water quality and the feeding condition of the fish, and it is generally appropriate to eat within two hours. When the aquaculture condition is normal, the amount of feeding should not be more or less.
3. Timing: there should be a fixed time for feeding. If you feed twice a day, you can feed at 8-9 am and 3-4 pm respectively.
4. Fixed point: there should be a fixed place for feeding to make the fish develop the habit of eating at a fixed place, which is not only convenient to observe the dynamics of fish, check the eating situation, remove the residual feed, but also facilitate the application of drugs in the epidemic season of fish disease to achieve effective prevention and control.
IV. Timely fertilization
The main function of fertilization is to increase the nutrients in the pond water, make plankton grow and reproduce rapidly, maintain the ecological balance of culture water, and provide natural bait organisms for fish. On the basis of adequate application of base fertilizer, appropriate amount of topdressing should be applied in the middle of culture, and the principles of timely, less and diligent application should be grasped, and the pulp of fermented organic fertilizer or mixed compost should be better, and chemical fertilizer can also be applied.
Fifth, persist in patrolling the ponds
Form the habit of patrolling the pond in the morning, middle and evening every day, and observe the eating and activity of fish, the changes of pond water quality, etc., so that timely measures can be taken to find problems. Such as through inspection and observation, timely detection of early symptoms of fish disease, early examination and diagnosis, timely and effective prevention and control of the development of the disease. It is necessary to pay attention to the environmental hygiene of fish ponds, remove weeds by the pond, kill enemies and pathogens, fish residual baits and dead fish in time, and clean and disinfect food grounds regularly. By observing the changes of the pool water, we can apply fertilizer, change water or inject new water in time to keep the pool water "fat, alive, tender and cool".
VI. Prevention of injuries
Daily management, net fishing, box handling, aquaculture operation should be careful to prevent fish injury and infection.
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How to get fat for fish, shrimp and crab in autumn
First, change water reasonably and cultivate fertile water. Since May, "bait" and "liquid" have been used to control diseases and insect pests every other month or 20 days. In the transitional period of summer and autumn, more attention should be paid to the regulation of water quality; to prevent the pool water from becoming "turned" or "old", and to maintain the appropriate transparency of fertilizer and water. The transparency of fish ponds is about 25 cm, that of shrimp ponds is 30 to 36 cm, and that of crab ponds is 35 to 40 centimeters. If the transparency of the pond water is less than the normal needs of fish, shrimp and crabs, use quicklime 5 to 7.5 kg per mu in time.
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What should we pay attention to when giving an injection to a sick tortoise?
Artificial turtles can be treated by taking medicine, injection, rubbing medicine or even medicine bath if they get sick, among which the effect of direct injection into the tortoise is the fastest and the effect is the best. However, the tortoise has a carapace and has more bones and less flesh. Therefore, the following points must be paid attention to when injecting the tortoise, otherwise it is easy to cause harm to the tortoise. 1. Choose the right injection site. The muscles of the legs of the front and rear limbs of the turtle are relatively plump, and the injection is generally done from this point of view. During the injection, the angle of injection should be 45 °with the limb, and the angle is too high to damage the fascia or bone.
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