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. First, culture conditions Choose leeward sunny, wide water surface, stable water surface, no big winds, constant water depth of more than 5 meters, clear and pollution-free storage tanks, branch canals, etc. Set a small cage, it is best to have a certain micro-flow, the flow rate of water 3 to 10 meters per minute is appropriate. Second, the production and set up of small cages The making and setting of small cages The small cages mainly consist of frames, boxes, lids, feeding tubes, food trays and other parts. The upper frame is made of bamboo and wood. The lower frame can be made of 4 to 6 mm round steel. The box body is made of 22 polyethylene mesh stitches. The mesh size of the mesh is determined according to the specifications of the fish species to be placed, generally 2 ~3 cm; box cover made of opaque photosynthetic fiber woven fabric, length, width ratio of the upper frame 10 cm, used for suture; feeding tube with a diameter of 7 to 10 cm plastic tube or bamboo made of bamboo Placed on the upper part of the upper part of the cage, the upper end is 20 cm above the box, and the lower end is extended to 10 cm from the bottom of the box; the food table is made of polyethylene mesh sheet with 1 to 2 mm mesh, and the length and width ratio The lower frames are each 15 cm long and serve as a border. The arrangement of the small cages in the water is arranged in a "1" shape or "goods" shape, and the distance between the box and the box is maintained at 5 meters or more. The box is connected with a polyethylene rope and then submerged in water with stones. The box is 0.5 meters above the bottom of the water. The shore is piling and fixed. A small cage is put into the water about 7 days before the fish enters the box, so that the mesh clothing has some attached organisms and becomes smoother to prevent fish from being scratched. Third, fish species stocking When the water temperature is stable above 18°C, it can be stocked for early entry boxes to extend the growth period and increase the commercial fish size and yield. Generally, 400 to 500 tilapia, 50 to 100 grams of tail fish per square metre, or 300 tilapia, weighing 100 to 150 grams per square meter, should be reared. The fish stocks to be stocked should be physically strong and have relatively uniform specifications. . 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. Fourth, feeding and management (I) Feeding technology: Small cage fish farming must use full-priced pelleted compound feedstuffs. The feedstuffs can be self-provisioned or can be used to purchase finished product feedstuffs. It is required that the stability time of the feedstuffs in the water is at least 10 minutes, and the feedstuffs cannot be stored for a period of time. More than one month. Generally, the fingerlings can adapt to life within 1~2 days after entering the box. You can start to feed and tame the food. During the tame season, feed the fish at a 0.5% feeding rate every day, so that the fish is in a state of semi-starvation, so as to form floating and grabbing food as soon as possible. Conditioned reflex. After the tame was finished, the feed was started. When the water temperature was low, the tilapia had a small amount of food and was 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 feeding amount of each cage per day can be calculated according to the following formula: Feeding amount = weight of the boxed fish. Feeding amount is changed every 7 days or so, and the total weight of box fish is sampled every month. Due to the strong gluttony of tilapia, the feeding time should be controlled at 20 to 30 minutes per day, and 80% to 90% of the fish should eat until they leave. Feed the feed once and pour it into the feeding tube. (2) Daily management: Adhere to the inspection box every day to check whether the cage is damaged or not, and to prevent theft. The netting about 30 centimeters away from the water surface must be carefully observed. 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. V. Fishing 2 to 3 days before catching and fishing, feeds should be stopped. When catching, lift the bottom net of the net cage first, and insert bamboo nets under the bottom net to catch the fish to the other end of the net cage. Stubble Rotary Crusher,50HP Stubble Rotary Crusher,Dual Shaft Crusher,Tractor Drived Stubble Rotary Crusher Shandong Dahua Machinery Co.,Ltd , https://www.agrodahua.com
How to raise tilapia with a small cage