How to use swing purse seine to cultivate culter ilishaeformis.

External swing enclosure culture of Erythroculter ilishaeformis is a fishery production mode that uses bamboo, metal net or synthetic fiber as enclosure facilities to divide large and medium-sized external swing into scales that are convenient for management or can realize intensive culture. It is a new type of high-yield culture technology of erythroculter ilishaeformis by combining high-yield culture technology in ponds with excellent water environment in lakes and rivers, and strengthening fish blocking facilities and feeding management.

Site selection: a fence should be set at the exit of the lake swing, which should be able to resist the attack of water flow, typhoon and flood, and mainly limit the economic fish of culter ilishaeformis. It is required that the water depth is 2.5 ~ 3.0m, the bottom is flat, the sediment hardness is moderate, the outlets are few but not many, narrow but not wide, and the leeward is sunny, far away from the main channel and main water flow area. The fish culture area in the lake is generally below 500 mu, so that the water quality is easy to be stable, fishing is convenient, and oxygen supply is sufficient and even. The water area is too small, and the water quality is not easy to be self-purified and stable; If it is too large, the bait is scattered, fishing is difficult, and the water in the middle of the river is easy to lack oxygen, so the yield is relatively low. The basis of enclosure fish culture is to make full use of the bait productivity of existing waters and then supplement appropriate commercial bait. Therefore, the natural productivity of the selected waters is good or there are abundant natural bait sources nearby. In addition to abundant plankton, there are dense aquatic plants such as Sophora alopecuroides, black algae and POTAMOGETON malayi at the bottom of the swing lake, and benthos such as snails and mussels can be seen everywhere, which can reduce the amount of artificial bait and improve the stocking density of fish species. If natural bait resources are abundant, the use of commercial bait can be reduced, and the utilization rate of mixed bait can be greatly improved due to the complementary effect of bait.

Fence facilities: the shape of the fence should be adapted to local conditions, preferably square or round. It is best to face the water on three sides and dock on one side, which is convenient for daily management and catching adult fish in the market. Fencing facilities are the guarantee to prevent fish from escaping, so there are strict requirements for fish catching facilities. Fences can be made of double nets to prevent fish from escaping. The mesh should be determined according to the size of the fish to be stocked, and it is advisable not to escape the fish. The height of the net should be 50 cm higher than the highest water level. Other facilities are the same as general Internet cafes.

Stocking fish: after the net fence is built, remove the wild miscellaneous fish and aquatic plants in the net first. To be on the safe side, the wild fish in the net were completely removed by electric fishing, and 13 kg of bleaching powder was scattered per mu. The fish species of Erythroculter ilishaeformis can be released in the middle of February every year, with an investment of 1 0,000 fish per mu, and the investment ratio and specifications are: 80% of Erythroculter ilishaeformis, and the specifications are about1.3cm; Megalobrama amblycephala 5%, about 5 cm in size; Bighead carp 10%, the specification is about 10 cm, crucian carp 5%, the specification is 3 ~ 4 cm.

Feeding management: the key point of daily feeding management is to grasp the key points of "early, early, early, diligent and preventive"

Store fish early in the morning and try to finish it before the end of February every year.

Two legs means that the stocking amount of fish species should be sufficient and the feeding amount of feed should be sufficient.

The third duty is to patrol the pond frequently, so as to patrol in the morning and evening and protect at night; Second, it is necessary to check frequently, mainly the wall net and foil door, and repair the mouse hole and snake hole immediately; Third, diligently fishing for sundries, mainly fishing for residual bait, weeds, dead fish and other sundries on the water surface to keep the water surface clean.

The "four precautions" are to prevent escape, disease, flooding and theft, and ensure that the breeding results are finally completely transformed into economic benefits.

Fishing: Compared with pond culture, fish farming by throwing fences generally has a larger area, higher technical requirements and greater difficulty. Generally, comprehensive measures such as grasping, blocking, stabbing, pulling, dosing and electric drive can be taken.