How to prevent and cure "toxic water disease" in fish water body

Excessive dissolved oxygen "toxicosis"

1. Harm and symptoms. Due to the application of too much unfermented fertilizer in the water, the raw fertilizer decomposes into very small bubbles of methane and hydrogen sulfide at the bottom of the pond, and the fish fry are mistakenly swallowed for food. The main symptom is that the fish gills will adhere to many small bubbles, so that the fish float or swim out of balance. There are white bubbles in the intestines of the fish, or there are more air bubbles on the body surface, fins and Gill filaments of the fish. The fish body floats on the water surface and cannot sink, which can seriously lead to the death of fish in batches.

2. Prevention and rescue. When bubble disease occurs in the fish pond, the first is to quickly inject clear water and discharge part of the pond water at the same time, the sick fish can discharge bubbles in the clear water; the second is to sprinkle 400 to 600 grams of salt water per mu evenly to the water surface of the fish with bubble disease, and the third is to quickly transfer the fish to the new water environment.

Metal exceeding the standard "water poisoning"

1. Harm and symptoms. The disease often occurs in fry and species in newly opened fish ponds. As 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, and the body of diseased fish bends. Gill cover depression or mouth, upper and lower jaw and fins all appear deformities (also known as elbow disease). Diseased fish develop slowly, lose weight, and cause death in severe cases.

2. Prevention and control methods. Since 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 later; sick fish ponds should often change water to improve water quality, and feed nutritious feed to quickly enhance the physique of diseased fish.

Water body anoxia "toxicosis"

1. Harm and symptoms. Lack of oxygen in the water is easy to cause flooding (also known as turning over ponds). If the oxygen in the water drops to the limit that can not meet the minimum physiological needs of the fish, the fish can be suffocated and die. If not rescued in time, a large number of fish will die.

2. Prevention and control methods. Properly control the stocking density and reduce feeding and fertilization when the weather is muggy. Remove part of the silt from the bottom of the pond when clearing the pond in winter to prevent excessive silt from affecting the water quality. Aerators should be installed in high-yield fish ponds to increase oxygen regularly. The feeding should be qualitative, quantitative, timing and positioning, and the residual feed in the food farm should be removed in time. When diseased fish "floating head" is found, fresh water should be infused immediately, and the inlet should be covered with Reed mat or plank, so as not to cause the water to rush directly into the bottom of the pond and turn over the mud. The fish can also be transferred to the pond if necessary.