Pond polyculture squid notes

With the continuous development of fish culture technology in ponds, the varieties of polyculture fish have gradually evolved into carnivorous fish with higher economic value. At present, the main polyculture targets include squid, black peony, and squid. Shallow squid is favored by fishermen's friends because of its fast growth and high economic value. The pond polyculture carp is the use of carp on the characteristics of the selection of live bait specifications, first put the main fish, and then put the carp. The body length of the main cultured fish is greater than the opening size of the eel, so that the eel can not eat the main cultured fish, and then the eel's fierce feeding habit can control not only the wild miscellaneous fish but also the eel. It can also promote the increase of production of other fish, killing two birds with one stone. Then, what matters should be paid attention to in the pond polyculture squid? First, polyculture density polyculture of squid pond species can not be overstocked, generally in the fish pond in the fish stocking 1 winter fish species per mu 500 acres At the end, another 10 to 15 grams of scorpion fish weighing 10 to 15 grams, such as wild fish, can be increased to 20 to 40, after about 4 months of culture, each weighing up to 400 grams. Second, polyculture of carp pond water quality conditions Polyculture carp water requirements are more stringent than the average pond, the required depth of water is 1.8 to 2 meters, the transparency is greater than 15 centimeters, dissolved oxygen is often kept above 5 milligrams per liter, ammonia, nitrogen is not more than 0.025 milligrams / L, the carp is very sensitive to residual chlorine, the residual chlorine in the water should not exceed 0.002 mg / l, pH 7 ~ 8.5, such as a small amount of water plants in the water or micro-flowing water, will be more beneficial to eel conservation. There is no special requirement for water temperature in squid, the optimum temperature for life is 7-32°C, the optimum temperature is 18-25°C, and the food intake below 10°C in winter decreases, but it can still feed. III. Prevention of fish diseases in polyculture carp ponds Several commonly used drugs for salmon: Dosage: Copper sulphate and ferrous sulphate mixture (5:2) 0.7 mg/litre over the whole pond, bleaching powder 1 mg/litre Sprinkle over, used to disinfect and prevent ciliate disease. Salt solution 2% to 3%, immersed for 2 to 3 minutes, mainly used for disinfection and prevention of water mold, enteritis and so on. Potassium permanganate 5 to 10 mg/L is immersed for 3 to 5 minutes for disinfection, mainly for controlling ciliate diseases, hydromycosis, etc. Because of the relatively large living space and the small number of fish disease transmission pathways in polyculture fish, the incidence of disease is low. However, it should be noted that it is sensitive to drugs such as trichlorfon, malachite green, and mercurous nitrate. If other fish in the pond become ill, care should be taken to avoid these drugs.

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