Early spring release of fish species is exquisite

Early spring is the best season to release fish species, because during this period of time, the water temperature is low, the activity ability of fish is weakened, and the fish scales are tight, the fish body is strong, and it is not easy to be hurt by net-pulling, fishing and transportation, which can improve the survival rate of fish stocking. Attention should be paid to the following aspects when releasing fish fry:

Fish seed quality

Fish of the same age require the same specifications, similar body length and weight, thick back muscles, bright color, intact scale fins, lively swimming, strong traceability, Gill cover in the basin after leaving the water, the tail does not bend, beating more than, the body surface is free of scars and parasites.

Fish seed disinfection

1. Drugs should be used now, dispensing should use clear water, avoid using fat and water, and avoid direct sunlight when medicine is washed. two。 The drug dose should be accurate to avoid underdose or overdose. 3. The soaking time should be appropriate. When it is found that the fish can not stand the phenomenon, you should immediately add water or put the fish into another appliance.

Delivery method and time

Before the fish goes into the pond, first check whether the effect of the pond-clearing medicine has passed. The method is to put a small net cage in the fishing pond that is about to be released, in which dozens of fish are tried to observe overnight to see if their activities are abnormal, such as restlessness, floating head struggle, swimming around, and so on, indicating that there are still residues of medicine for clearing ponds and shall not be released immediately. Fish can only be released after the drugs have completely disappeared. In addition, the fish species must be netted 1 or 2 times before entering the pond to remove harmful insects, frog eggs and wild miscellaneous fish from the pond, so as to ensure the safety of the fish species.

It is best to go to the pond at noon on a continuous sunny day, when the fish species adapt most quickly and the survival rate is the highest. In windy weather, fish species should be released in the upwind of the fishing pond, so as to avoid being blown to the edge of the pond in the downwind.

Pay attention to the temperature difference in the lower pond. When entering the pond, it should be noted that the temperature difference between the water temperature of the fish seed container and that of the pond shall not exceed 3 degrees Celsius. If the temperature difference is too large, the water temperature in the container should be adjusted to make it close to the pool water temperature. Fish species transported with oxygen in plastic bags should be treated by "slow fry" when they go into the pond. The fish species should also be counted accurately when they go into the pond.