Beware of fish flooding in summer and autumn high temperature season

Due to negligence in management, pond fish flooding often occurs in ponds, resulting in great losses to mariculturists. In order to prevent pond fish from flooding, the symptoms, causes and control measures are briefly introduced as follows, which can be used as a reference for fish farmers.

1 symptoms of disease

Pond fish floating head due to severe hypoxia, scattered throughout the pond, mouth open and close, calmly directly from the surface of the air to absorb oxygen, serious slowly turn up, struggling to maintain balance, repeated several times before the abdomen died upward.

2 species of dead fish

Fantang dead fish, with poor hypoxia tolerance of the mackerel, silver carp, bighead carp are common, carp, crucian carp are not easy to die.

3 occurrence time

Fantang mostly occurs in summer and autumn high temperature season, especially continuous low pressure muggy weather, continuous overcast rain and thunderstorm weather. It mostly occurs from 24:00 at night to 5 in the morning.

4 the cause of occurrence

It is mainly due to the deterioration of water quality, bad weather and excessive stocking density, resulting in serious hypoxia in the water body, coupled with the poor physique of the fish itself, resulting in flooding ponds.

5 Prevention and control measures

5.1 inject a large amount of new water in time, and it is taboo to add water in the evening, so as not to cause early convection in the upper and lower water layers and cause anoxic floating heads of fish.

5.2 start the aerator. Continuous hot and rainy days in the middle of the night, when the weather is muggy, the boot time can be appropriately extended, when the weather is cool, reduce the boot time; midnight floating head increases the boot time.

5.3 when necessary, add oxygen enhancer-"photosynthetic bacteria preparation", which can effectively increase the amount of dissolved oxygen and make the water quality to a state of fertilizer, activity, freshness and freshness, so as to reduce or reduce the phenomenon of floating head flooding.

5.4 Comprehensive disease prevention. Before the advent of hot, muggy, cloudy and rainy days in summer, we should do a good job in the prevention and control of fish diseases and insect pests in time to enhance the physique of pond fish and ensure safe passage through the hot summer and autumn high temperature seasons.