How to prevent and cure the "water poisoning" of fish

The water body is the air for fish to live. In recent years, due to water pollution (such as dissolved oxygen exceeding the standard. The metal exceeds the standard. The water body is lack of oxygen, etc.), which makes the fish suffer from water poisoning, resulting in a large number of deaths. The following methods can be used for the prevention and treatment of water poisoning in fish bodies.

I. excessive toxic water caused by dissolved oxygen

Excessive dissolved oxygen in water will cause eutrophication and lead to many diseases such as bubble disease in fish.

1. In the harmful and symptomatic water body, due to the application of too much unfermented fertilizer, small bubbles of methane and hydrogen sulfide were decomposed at the bottom of the pond, and the fish fry were mistakenly swallowed as food. The main symptoms are that many small bubbles are attached to the fish gills, which makes the fish float or lose balance; there are white bubbles in the fish intestines, or there are more air bubbles on the body surface, fins and Gill filaments, and the fish body floats on the water surface, which can cause fish death in serious cases.

two。 When preventing and treating bubble disease in fish ponds, the first is to quickly inject clear water and discharge part of the pond water, the less sick fish can discharge bubbles; the second is to sprinkle 400 to 600 grams of salt water per mu of water evenly, and a good treatment effect can be obtained within a few hours; the third is to quickly transfer the fish to new water.

2. Excessive toxic water caused by heavy metals

1. Damage and symptoms the pond water is polluted by substances such as heavy metal salts, or lack of certain nutrients (such as calcium and vitamin C, etc.), the nerves and muscles of fish are stimulated to produce deformities. The body of the diseased fish is bent, the Gill cover is sunken or the upper jaw and fin of the mouth are deformed (also known as curved body disease). The diseased fish develop slowly and lose weight, causing death in serious cases. The disease mostly occurs in fry and species cultured in newly opened fish ponds.

two。 Prevention and treatment of adult fish generally do not develop this disease, it is best to raise adult fish for 1 year or 2 years before releasing fry or fry; sick ponds should often change water to improve water quality, and feed nutritious bait to quickly enhance the physique of diseased fish.

3. Anoxic toxicosis of water body

1. Damage and symptoms hypoxia in the water is easy to cause hypoxic toxicosis, also known as pan-pond. If the oxygen in the water can not meet the physiological needs of the fish, it can suffocate the fish and die. If not rescued in time, a large number of fish will die.

two。 The stocking density should be properly controlled in prevention and treatment, baiting and fertilization should be reduced properly in muggy weather, and part of the silt at the bottom of the pond should be removed in winter to prevent excessive silt from affecting the water quality. Aerators should be installed in high-yield fish ponds to increase oxygen regularly. Feed should be fixed, quantified, timed and positioned, and the residual bait in the food farm should be removed in time. It is found that the floating head of fish should be infused with fresh water immediately, and the inlet should be covered with Reed mat or plank, so as not to let the water directly hit the bottom of the pond and turn over the silt. If necessary, the fish in the pond can be transferred to the pond, or chemical oxygenator can be used to increase oxygen.