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近几年,各地养蟹业发展很快,但幼蟹在培育中性早熟现象严重,影响了成蟹养殖。一龄蟹种出现早熟的原因,根据笔者近年来的养殖实践分析认为是:人工养殖条件下,环境优越、饵料充足和蟹苗质量等多方面综合因素的结果。还有河蟹性腺发育受有效积温影响。河蟹人工育苗使生长期提前数十天,增加了有效积温,水温比天然水域高,新陈代谢快,摄食量大,过剩营养物质沉积于肝
In recent years, the development of crab farming around quickly, but the crab nurturing the phenomenon of severe precocious puberty, affecting crab farming. First instar crab species appear premature, according to the author in recent years, farming practice that is: artificial breeding conditions, environmental advantages, adequate food and crab quality and many other factors combined results. There are crab gonadal development affected by the effective accumulation of temperature. Crab artificial breeding seedlings so that the growth period ahead of schedule, an increase of effective accumulated temperature, water temperature higher than the natural waters, fast metabolism, food intake, excessive deposition of nutrients in the liver