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The technique of cage culture of tilapia
Dec 18, 2018

Tilapia has a wide diet, fast growth, strong disease resistance, low oxygen tolerance and many other advantages. Tilapia cultivation in cage can improve the efficiency of reservoir water production. The technical essentials of cage farming tilapia are as follows:I. reservoir conditionsTilapia cultivation in the cage of the reservoir should be carried out in places where the wind is against the sun, the water surface is open, the water level is stable, the water quality is fresh, the water source is pollution-free and the transportation is convenient. It is required that the water body is rich in dissolved oxygen, the pH value is 7.2 -- 8.0, the water depth is 4 meters -- 5 meters, and the water conservancy facilities of the reservoir are complete, which is not vulnerable to floods. Tilapia tropical euryhaline fish, have a stronger ability to adapt to the environment, the water in the water, low oxygen can survive, optimum range of temperature is 20 , 35 , the optimal temperature is 25 , 34 , the temperature dropped below 16 , the little food or stop feeding. Breeding stage, therefore, should keep the water temperature at 20 , 35 , between salinity at about 1.4.Two, cage productionCage should be woven by polyethylene material, double layer structure, the internal is a nodal cage (closed), the external is a nodal cage (open type), the top cover of the net for a single layer, mesh 1.5cm -- 2.5cm, specifications for 6 meters x 6 meters x 2 meters. Cage with floating frame support, with a long stone as a sinker, knot in the cage below the four network Angle, so that the cage in the water fully formed. The cage is fixed by cable, the cable diameter is 4 cm of polyethylene thick rope, cable across the water, straightened and tied to the shore fixed on the pile, the two cables apart from 8 meters. Cage fixed through the cable, in the water is a "one" glyph arrangement, cage above the water 20 cm - 30 cm. The cage should be installed 10 days before the fish into the box into the water, let the net clothes epiphytic algae, fish into the box to avoid the net clothes abrasion fish body.Three, fish stockingThe guarantee of high yield of tilapia in cage culture is that it is necessary to breed large size fish with tail weight of more than 200g. Free range tilapia requires a neat scale, bright body color, complete fin strip, scales do not fall off, no injury to the surface of the body, strong physique, swimming lively. Grazing time in early may, in more than 20 temperature stability. The number of free-range fish shall be 150g/tail -- 200g/tail 5000 -- 6000 per box. Before the fish species enter the cage, bathe the fish body in salt water with a salinity of 3-4 for 15-20 minutes.Iv. Feed feedTilapia is a kind of omnivorous fish, which is mainly fed by plant feed. Under the condition of cage culture in reservoir, it is advisable to feed full-price compound feed, and assist in feeding green feed. The formula of full price compound feed (for reference) is: fish meal 30%, soybean cake 20%, flour 15%, corn flour 15%, bran 15%, yeast 2.5%, mineral 2%, vitamin 0.5%. The protein content in feed should achieve 35% above. Feed grain size is 2 mm -- 4.5 mm. Green feed can be fed to the duckweed, bitter cabbage, alfalfa grass, etc., to supplement the lack of vitamin C in the feed. Tilapia can be started feeding 2 days after it is put into the box -- 3 days. Before feeding, it should be domesticated. According to the rhythm of "slow -- fast -- slow" and "less -- more -- less", it should be domesticated for 1-1.5 hours a day for 10 consecutive days. The daily feeding amount is 5% -- 8% of the total body weight of fish. The daily feeding amount is 3 times -- 4 times, about 0.5 hours -- 1 hour each time. The feeding amount should be adjusted according to the water temperature change, weather change, fish feeding and activity.We should pay attention to the principle of "four determinations" in feeding methods. Tilapia fish in the water temperature is 25 , 34 when growth is accelerated, should increase the feeding amount, when the bad weather such as rainy, hot, thunder shower throw the bait to reduce or stop the bait casting. Green fodder can be fed once a night, with 1% bleach disinfection into the cage, the amount of feeding the next day no grass shall prevail.V. daily management1, adhere to the tour boxAdhere to the daily inspection box, regularly check the growth of fish, reasonable feeding, careful observation, analysis of fish situation, find problems in time to deal with, and do a good cage farming log, record the daily water temperature, feeding, feeding, dead fish and disease.2, diligent in brush boxWash the cage every 10 to 15 days to remove residual bait, dirt and algae, so that the water is fully exchanged.3. Check boxes regularlyOften check the cage, found damaged timely repair, avoid escaping fish or ferocious fish into the box. In the flood season but also timely check the rope strength, cable is firm, whether the deformation of the clothing, and so on.4, often adjust the boxWith the fluctuation of reservoir water level, the cage must be adjusted to the appropriate position of water depth and water quality.Vi. Prevention and treatment of fish diseasesFish species into the box to wash with salt water, but also regular disinfection, every 10 days or so to feed bait once, even feeding 3 days -- 5 days, prevent the breeding of parasites in the fish body. Every 10 days -- 15 days each cage with quicklime 150 grams -- 200 grams of slurry in hot whole box sprinkle, purify water. Use full box of insecticides and disinfectant every month. In addition, green feed must be disinfected before feeding.

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