Heavy metal pollution poisoning. Heavy metal refers to a metal with a relatively high density, such as lead, manganese, zinc, and the like. The gills of the poisoned fish are pale and secrete large quantities of mucus, forming flocculent deposits, which cause obstruction of the gills and cause respiratory disturbances. Poisonous fishes often swim in the surface waters. Fish lead poisoning, body color was clearly black. Copper fish poisoning, grayish-white body color, pale green silk. Chromium poisoning of fish, the body surface is dark yellow, yellow silk brown silk.
Sodium pentachlorophenol poisoned. Sodium pentachlorophenol is the most common organochlorine compound. It is mainly used as an antituberculosis drug and it is also an insecticide. The fish that were poisoned by sodium pentachlorophenate swam sharply and jumped up and down without a goal, and the poisoned fish had a habit of drilling into the grass before the death. Under normal circumstances, the wild fish first die, then the fish such as calyx, white pelagic, grass carp, squid, squid, etc. have died one after another, and the body becomes dark after death. Chronic poisoned fish fins become dark and the eyeballs protrude.
Methamidophos poisoning. Methamidophos is an organophosphorus pesticide that is commonly used as an insecticide. The poisoned fish are irritated and restless. They swim slowly after an ambush, appear sideways, head down, tail up and other symptoms, and finally sink into the water to die.
Dimethoate poisoning. After dimethoate poisoning, the symptoms were not obvious, but the fish's liver was swollen.
Furan Dan pollutes poisoning. The main symptom of fish poisoning is the bending of the fish body, and the excrement outside the anus forms a “tailâ€.
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