所谓扣蟹是指Ⅲ、Ⅴ期幼蟹经养殖越冬后,体重达5～25克的蟹种,又称“铜钱蟹”。它类似于池塘养鱼中的大规格鱼种。许多土产单位在扣蟹的培育过程中,常常会出现越冬死亡率高和越冬后性早熟而成批死亡的现象。造成了很大的损失,所以此阶段是隔年蟹养殖成败的关键阶段。根据近几年的实践,笔者认为应从以下几个方面强化培育。 一、控制密度。由于放养的幼蟹当年不能上市,所以应采取密放的方法,控制其规格和发育程度,一般在6、7月份,亩放Ⅴ期幼蟹(每公斤6000只左右)4—5斤,这样至翌年3月初,就可起捕到规格为每公斤几十只的蟹种。这里应该注意的是,从外地购回的 The so-called buckle crab refers to Ⅲ, Ⅴ crab breeding overwintering, weighing 5 to 25 grams of crab species, also known as “copper crab.” It is similar to the large fish species in pond fish farming. Many units in the development of crabs often appear overwintering mortality and precocious puberty after the batch of deaths. Caused a great loss, so this stage is the critical stage of success or failure of crab farming every year. According to the practice in recent years, I believe that should be strengthened from the following aspects of cultivation. First, control density. As stocking crabs can not be listed that year, it should be taken in an open manner to control the size and development level, usually in June and July, mu release Ⅴ crabs (about 6,000 kg per kg), so To the beginning of March next year, you can catch the specifications for dozens of kilograms per kilogram of crab species. It should be noted here that the purchase from the field