1. When farmers purchase the trout fingerlings, they should correctly distinguish the pros and cons of the fingerlings according to the biological characteristics of the main trout culture species and avoid being deceived. Second, the design of a good stocking stocking density In order to reduce the cost of farming, it is best to cultivate large-scale fish species on their own. The use of ponds to cultivate carp fingerlings, stocking squid from 0,800 to 120,200 catfish per acre, can achieve the purpose of developing 50-60 grams of specifications. When carp adult fish culture is conducted, when the average size of the fish species is 50-60 grams, the 1500-1800 tail of the carp species to be stocked per acre is the most ideal, and the commercial fish can be up to 350-400 grams in size. Third, determine the collocation To cultivate large-size catfish species, do not use grass carp and catfish. Instead, choose carp and catfish. The quantity should account for about 20% of the main carp and carp account for about 10% of carp. It is not too early to match the species' stocking time, especially if the fish is used too early to influence the domestication of the catfish. Fourth, domestication of fingerlings Squid is a fish living in the lower and middle layers of the water body. It mainly raises the fish ponds of the carp. After the domestication of the fish species, it can reduce feed costs and increase profits. It is relatively easy to domesticate squid during the cultivation of fish species. The domesticated fish species have a short time for catching and eating during adult culture and are easy to manage. Adding appropriate additives in the feed during domestication can shorten the acclimation time and increase the feeding area and quantity of squid. The density is large, the number of groups is large, and it is easy to acclimate. On the contrary, the percentage of long-term domestication and the tendency to catch up and snatch food is low. When the density has been determined to be unchangeable, the water level of the pond can be reduced. If the density is relatively increased, it will not only facilitate domestication, but also increase the pond water temperature and promote fish growth. With squid and squid species, they should be released after the main squid has not formed. The water during the domestication period should be "lean" and not "cloudy." V. Feed particle size and feeding rate The selection criteria for the size of feed for squid should be “small is not bigâ€. When the size of the common bream is below 10g/tail, the particle size of the feed is 0.50mm; when 10-30g/tail, 1mm is selected; 30-75g/tail is 1.50mm; 75-100g/tail is 2mm 150-300 g / tail when selected 2.40 mm; 300 g / tail over 3.20 mm. The feeding capacity of fish is directly affected by the size of the fish and the temperature of the pond water, so the feeding rate should be adjusted according to the actual situation, and should not be the same. Six, fish disease prevention Although the disease resistance of carp is strong, in recent years, carp hemorrhagic disease has been found. Although the incidence of this disease is not high, once it is allowed to develop, it will lead to a large number of carp deaths. The disease is mainly manifested in the sick carp: floating water (fatigue), pale color, the body surface of the abdomen, the spine on both sides (fine scaly) visible needle parasite parasites. The worm body has red erythema in the size of green bean or pea, and loose or detached scales at the lesion site. Greenhouse Film Manual Roll Up The Greenhouse Film Electric Roll-Up Unit replacing traditional manual roll-up unit to reach high speed automation in revolving & releasing films and greenhouse environment, it is the new generation of greenhouse ventilation and temperature regulation facilities. Portability, output torque, output lock, wide range and precise adjustment, waterproof, dew-proof and power-saving are the key characteristics for Electric Roll-Up Unit, which is the best choice for modern daylight greenhouse applied in different climates. Greenhouse Film Manual Roll Up,Greenhouse Manual Winch,Greenhouse Side Film Roll Up JIANGSU SKYPLAN GREENHOUSE TECHNOLOGY CO.,LTD , https://www.greenhousehydroponic.com