体质健壮的鱼种是提高成鱼产量的重要基础,也是提高鱼种成活率的主要条件之一。鉴别鱼种质量的主要标准有五种,可以概括为四看和一抽样。 一看就是看出塘规格是不是均匀。同样鱼种,凡是出塘规格均匀的,体质都比较健壮。而个体差距较大的,往往群体成活率比较低。 二看就是看鱼种的体色。就是通过鱼种的体色,反映鱼种体质的优劣。不同的鱼种,有着不同的体色。一般来说,优质草鱼种的体色为淡金黄色,灰黑色网纹状鳞片比较明显。鱼体越健壮,淡金黄色越显著。优质青鱼种的体色为青灰带白,鱼体越健壮,体色越淡。优质鲢鱼种的背部为银灰色,身体两侧和 Healthy fish species is an important basis for raising adult fish production, but also to improve the survival rate of fish species is one of the main conditions. There are five main criteria to identify the quality of fish species, which can be summarized as four-look and one-sample. A look is to see Tong specifications are not uniform. The same species, all the Tong specifications uniform, more robust physique. The larger individual differences, often the survival rate of the group is relatively low. Second look is to see the color of fish species. Is through the color of fish species, reflect the pros and cons of fish species. Different species have different body colors. In general, the quality of grass carp species is light golden yellow, gray-black reticulate scales more obvious. The more robust fish, pale gold more significant. High-quality species of black carp color gray with white, the more robust fish body color lighter. The back of the silver carp is silver-gray, both sides of the body