Detailed Explanation of Common Disease Prevention and Control Methods for Crucian Carp
Crucian carp is mainly farmed in the middle and lower reaches of the Yangtze River in China. In recent years, with economic progress, the market for crucian carp has gradually expanded, followed by an increase in farming density and area. Excessive use of antibiotics and other drugs has led to an increasingly higher incidence of diseases in crucian carp. Once a disease occurs, it spreads extremely quickly and causes a relatively high mortality rate, affecting the income of farmers. So what are the main diseases of crucian carp? Qinnong Network brings you common disease prevention and control methods for crucian carp. Let us learn about them together.
1. Saprolegniasis
Saprolegniasis is caused by fungi parasitizing the body surface of crucian carp. When the water temperature is 10-15°C, fungal spores reproduce easily. Then, due to excessive farming density, abrasions on the body surface caused by crucian carp swimming or other reasons, the fungi take the opportunity to attach, germinate and parasitize at the wound site. As they reproduce, they gradually spread, causing mold to appear on the entire surface of other crucian carp, and finally causing the fish to swim abnormally, lose appetite, become weak, and die.
Prevention and control methods: It mainly occurs during low-temperature periods in spring. Control farming density, carry out disinfection regularly, strengthen water quality management, and prevent the water body from becoming too fertile.
2. Hemorrhagic disease
Hemorrhagic disease mainly occurs in environments with poor water quality management that lead to water quality deterioration, and it is especially frequent in highly intensive farming environments. When it occurs, it comes on fiercely, spreads extremely quickly, and has a high mortality rate. When the disease occurs, different parts of the crucian carp such as the eyes, oral cavity, and fins become congested and bleed, and the internal organs also bleed and swell.
Prevention and control methods: Disinfect regularly, inject new water, splash water quality improvers, and strengthen water quality management. When the disease occurs, crush 2-3 tablets of Bingduiling and mix them into feed for feeding, then feed 1 gram of Xuezhiling No. 1 per 5 kg, and it can be cured after one continuous week.
3. Hepatobiliary syndrome
Hepatobiliary syndrome is a relatively prevalent disease that has been triggered in recent years by increased farming density. Many farmers, in order to reduce farming costs and save time and effort, do not pay attention to water quality during farming, and the feed is relatively single, leading to nutritional imbalance and disease onset. When the disease occurs, the tail tip and fin tips of crucian carp become swollen and discolored.
Prevention and control methods: Strengthen water quality management during normal times, regularly disinfect the water body with bleaching powder or chlorine dioxide, improve the feed formula, balance the combination, and enhance the nutrition needed for the growth of crucian carp.
4. Red gill disease
Red gill disease mainly occurs during periods of higher temperature, when the water temperature is around 20-26°C. When the disease occurs, crucian carp remain motionless 5-10 cm from the water surface. When something is used to scare or strike at them, they will droop, but after a while they will return to remaining motionless as before. In addition, diseased fish are dark and thin, and the gills are congested, red, and swollen.
Prevention and control methods: When clearing the pond, be sure to pay attention to disinfection measures. During farming, pay attention to controlling water quality. The carbohydrates in the feed must not exceed 40%. After the disease occurs, strontium perchlorate can be splashed on the pond for treatment.
The above are the common disease prevention and control methods for crucian carp brought to you by Qinnong Network. From the content above, it can be seen that the causes of crucian carp diseases are mainly water quality problems and farming density problems. Farmers must pay attention to these two points during farming to ensure the disease-free growth of crucian carp.