论文部分内容阅读
多年来,河蟹早熟问题一直困扰着河蟹养殖业。本人根据多年来的观察和实践,认为河蟹早熟主要有以下几方面的原因: (一)积温升高 河蟹性腺的发育与池塘水有效积温值高低有关。因为池塘养蟹的养殖周期大于自然水域中的
Over the years, crabs precocious problems have been plagued crab farming. I based on years of observation and practice, that crab precocious main reasons for the following aspects: (A) increase in temperature Crab gonadal development and pond water effective accumulated temperature levels. Because the pond crab farming cycle is greater than in natural waters