How to prevent disease when stocking fish in spring? A detailed guide to practical measures

In spring, as water temperatures rise, pathogens multiply easily. When stocking fish, besides choosing high-quality fingerlings of uniform size and without injuries, attention must also be paid to preventing disease. The main measures are as follows:

Pond preparation and tool disinfection. Before stocking fish, weeds should be removed, excess silt cleared away, leaks plugged, and the pond bottom leveled. Then quicklime, bleaching powder, and other substances should be applied by broadcasting over the entire pond. Fishing nets, fish buckets, and other @#@233@#@ tools should be exposed to sunlight for about 2 days before use, or soaked and disinfected in high-concentration quicklime water, bleaching powder solution, and the like.

Fish body conditioning. To maintain the disease resistance of stocked fingerlings, before release they should be conditioned by being seined or held densely in net cages, so as to strengthen their physique and improve their agility.

Fertilizing the water before stocking. In spring, pond water is generally rather clear with few plankton, so fingerlings may lack natural food after being stocked. Organic fertilizer can be applied in advance, or chemical fertilizer can be applied as a supplementary dressing on a temporary basis; the best method is to apply biological fish fertilizer.

Fingerling disinfection. Before fingerlings are stocked into the pond, they should be bathed with medication to kill pathogenic microorganisms and parasites attached to the skin and gills. Commonly used methods include soaking and washing the fish with iodine preparations, salt water, Chinese herbal medicine liquids, and the like. The use of drugs banned by the state, such as malachite green and other fishery drugs, must be firmly rejected. Copper sulfate, trichlorfon, and other drugs may also be chosen for disinfecting the fish body. Which specific drug to use should be decided flexibly according to the specific circumstances and purpose of use, and it may also be used under the guidance of aquatic product technical professionals.

Pay attention to immunization and prevention. Hemorrhagic disease, enteritis disease, and gill rot disease are common diseases of grass carp. When stocking grass carp fingerlings, grass carp immune vaccine can be injected, which can also achieve the purpose of preventing fish diseases.