How to avoid cage fish breeding

In recent years, some fish farmers in cages often report to the author that their cages have been damaged and escaped fish accidents. When they are discovered, the losses are already great. How to prevent such accidents from happening? The successful anti-escape experience of several cage high-yield households in Dongping County, Shandong Province is described as follows:

First, pre-prepare a small cage of 4~5 meters to prepare for use when the cage moves. When you are ready to move the cage, place the small cage below the corner of the cage. Focus the fish on the corner and spread out the small cage so that the corner of the fish is doubled and carefully moved. It can reduce cage fish escape.

Second, usually outside the four corners of the cage with a larger mesh around a layer to protect the network. Periodically try to use a gill net between the guard net and the cage to test whether the cage escapes fish.

Thirdly, put 10 red snappers in each cage. Look for the number of red snappers every day when they are fed to understand the situation of fish escape.

The fish that had just been placed in the cage began to swim along the edge of the net first, and then some fish began to jump upwards. The phenomenon of jumps was the most during the night and gradually decreased on the second day. Therefore, special attention should be paid to the escape of fish after just stocking.

5. In the culture, if one day suddenly discovers that the school of fish has lost the conditioned reflex on the induced sound, there is no significant change in the weather and the water quality. At this time, if there is a hole in the cage, there will be not only a hole but also a hole. Some fish escaped, and the rest of the fish were not stable. The fish lost their reaction to feeding.

6. Strengthen inspections and check at least once a week. Generally, in the days when the storm is small, check after the morning or midday feeding. When checking the net, special attention should be paid to the section of the water that is 30 cm below the water. Due to the impact of floating objects, it is easy to break and escape fish. After checking the net, check the points where the bottom net and the bottom frame are connected. Nets in these places are prone to wear or tear to form loopholes. Accidents of netted fish were mainly occurred one month after stocking. Because the fish was smaller at this time, the cage was untested. Therefore, the inspection should be strengthened within the first month after stocking.