Small cage culture tilapia technology

Small cage culture refers to high-density fish farming in small cages with a volume of 1 to 4 cubic meters. Tilapia is suitable for high-density culture of cages due to its low resistance to dissolved oxygen and strong disease resistance. Now the tilapia culture of small cage culture is briefly introduced as follows: 1. The breeding conditions are to choose sunny leeward, wide water surface, stable water surface, no excessive wind, constant water depth of more than 5 meters, clear and pollution-free water tanks and branch canals. Set up small cages, etc., preferably with a certain amount of micro-flowing water. The flow rate of water is preferably 3 to 10 meters per minute. Second, the production and set up of small cages Small cages mainly by the frame, box, box cover, feeding tube, food plate and other parts. The upper frame is made of bamboo and wood, and the lower frame can be made of 4 to 6 mm round steel; the box body is made of 22 polyethylene mesh stitches, and the net mesh size is determined according to the specifications of the fish species to be put, generally 2 ～3cm; Cover is made of light-proof photosynthetic fiber woven fabric, length, width ratio of the upper frame is 10cm, used for suture; feeding tube is made of 7~10cm diameter plastic tube or bamboo bamboo. Placed in the center of the upper part of the cage, the upper end is 20 cm above the box, and the end extends 10 cm from the bottom of the box. The table is made of polyethylene mesh sheet of 1 to 2 mm mesh length and width. 15 cm longer than the lower frame, used as a border. The arrangement of the small cages in the water is arranged in a “1” shape or a “goods” shape. The distance between the box and the box is maintained at more than 5 meters. The box is connected with a polyethylene rope, and then the stones are submerged into the water. 0.5m above the water bottom, shore piling fixed. A small cage was put into the water about 7 days before the fish was put into the box, so that some of the attached creatures were brought to the net to become smooth, so as not to scratch the fish. Third, the species stocking in late April to early May, when the water temperature is stable above 18 °C, they can be stocked, and strive to get into the box early to extend the growth period and increase the commercial fish size and yield. Generally, 400 to 500 tilapia weighing 50 to 100 grams per square meter, or 300 tilapia weighing 100 to 150 grams per square meter, should be stocked. Consistent, more uniform. In order to prevent fish diseases caused by operation damage, the fish species must be sterilized before the fish species are put into the tank. The disinfection method can be used for dipping the fish species for about 5 minutes with salt water or with a 15 ppm bleach solution for about 20 minutes. IV. Feeding Management (I) Feeding Technology Small cages for fish farming must use full-priced granulated compound feeds. Feeds can be self-provisioned or can be purchased as special feed for finished products. Stable time for feedstuffs in water is at least 10 minutes or longer. The storage period cannot exceed one month. Generally, the fingerlings can adapt to life after being put into the box for 1 to 2 days, and they can start feeding and tame food. During the tame season, they are fed at a rate of 0 to 5% per day, so that the fish are in a state of semi-starvation and form a floating flounder as soon as possible. Conditional reflection of food. After the domestication is completed, feeding is started. When the water temperature is low, tilapia eats small amounts and can be fed 2 to 4 times a day. When the water temperature is high, it is also a time when the fish grows vigorously. It needs to be fed 5 to 6 times a day. The daily feeding amount of each cage is calculated as follows: Feeding amount = Feeding rate Box fish weight Feeding amount Every 7 About a day exchange, the total weight of box fish surveyed every month. Due to the strong gluttony of tilapia, the daily feeding time should be controlled within 20 to 30 minutes, and 80% to 90% of the fish should eat until they leave. Feed the feed once and pour it into the feeding tube. (b) daily management adhere to the inspection box every day, check whether the damage to the cage, to prevent theft, it is best to check in the early morning and evening every day, about 30 cm away from the surface of the water at the net particularly close look. Remove the weeds and dirt from the cage, brush the cage, keep the cage clean and exchange the water, and observe the growth of the fish so that the feed rate can be adjusted in time, and check the disease at the same time. 5. Feeding feed should be stopped 2 to 3 days before fishing and fishing. When fishing, the bottom net of a cage should be lifted first. Use a bamboo raft to insert it under the bottom net. Bring the fish to the other end of the cage and use a dip net for fishing.

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