Net cage fish escape prevention technology
In recent years, some cage fish farmers have often come to the letter and reflected that their cages had been damaged and escaped from fish accidents. When they found out, the losses were already great. How to prevent such accidents from happening? The successful anti-escape experience of several high-yielding cages in China is described as follows: (1) Pre-prepare a 4--5 m2 small cage for use when the cage is moving. 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. (2) Usually outside the four corners of the cage, use a mesh with a larger mesh 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. (3) Put 10 red snappers in each cage. Look for the number of red snappers in each cage to see if the fish escaped. (4) The fish that had just been placed in the cage began to swim along the edge of the net, and 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 culture, if one day suddenly discovers that the fish population has lost its conditioned reflex on the induced sound, there is no significant change in the weather and water quality. At this time, we will be wary if there are any holes in the cage. After the hole is broken, it will not only Some of the fish escaped, and the remaining 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. Check your nets, with particular attention to the section of 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.
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