Occurrence of disease in intensive culture of grass carp

Occurrence of grass carp disease is closely related to climate change. In our county, the main manifestations are the "barley yellow" and "white dew" peak periods, followed by the "summer solstice" period, and before and after the "Early Autumn" period. Details are as follows:

I. "Barge Yellow" stage. At this time, the temperature is in a rising stage, the temperature is fluctuating, extremely unstable, the fish is relatively weak after wintering, the resistance is decreased, and when the temperature rises or falls, it is vulnerable to intense stress reactions and becomes susceptible to disease. This stage is prone to parasites and gill disease.

Second, the "white dew" stage. Fish is still in the late growth period. Most of the grass carp has grown to the commercial fish size, but the disease of this stage of the fry fish fry erupted, causing a large number of deaths.

Third, the "summer solstice" stage. At this stage, fish are in a growing season. If the feed is overdose in the early stage, it can easily cause hepatobiliary syndrome and fatty liver fish, which will reduce the fish's constitution. At this time, it is a period of bacterial fish disease, and the water quality conditions are poor. It is one of the periods of severe disease, and the farmers should be highly Pay attention to the prevention and treatment of fish diseases.

Fourth, "early autumn" stage. Due to the impact of the typhoon, thunderstorms and showers are frequent, and the dissolved oxygen in the water body fluctuates drastically. The density of farmed fish is high, and it can easily cause oxygen deficiency and flooding. At this stage, attention should be paid to the round-fishing to achieve market-standard commercial fish sales, to reduce the density of livestock breeding, and to put more oxidizing reforming agents to regulate water quality. This stage is the most prone to bacterial septicemia, and the main fish are salmon, squid, cockroaches, and fleas.

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