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品种效益。养鱼户所养的品种不同,其效益则有明显的差异。例如,去年7～8月间,达到商品鱼规格的鲤鱼每千克6元,可250克以上的鲫鱼每千克价格却在8～10元左右。二者的生产成本差不多,而养殖鲫鱼就比养殖鲤鱼效益好。又如土塘虱,每千克价格在20～25元,而埃及塘虱每千克却6～7元;在肉料比大致差不多,喂法和管理基本相同的情况下,土塘虱每667平方米产值比埃及塘虱高出2000～3000元。规格效益。鱼类的上市规格和效益
Variety of benefits. Farmers raise different varieties of fish, the benefits are obvious differences. For example, between July and August last year, carp, which reached the specifications of commercial fish, cost 6 yuan per kilogram while the price of crucian carp that can consume more than 250 grams per kilogram was about 8 to 10 yuan. The production costs of both are similar, but farmed carp is more effective than the carp. Another example is Tuotang lice, the price per kilogram 20 to 25 yuan, while the Egyptian pond lice per kilogram but 6 to 7 yuan; roughly the same flesh, feeding method and management under the same circumstances, earthworm lice per 667 square Rice production value higher than the Egyptian pond lice 2000 ~ 3000 yuan. Specification benefits. Fish market specifications and benefits