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河蟹经济价值很高,属于高档菜淆.但由于自然界的河蟹资源枯竭,因此人类不得不采取对策,研究人工养殖方法,来增加河蟹的产量.目前河蟹人工繁殖虽然获得成功,但养殖技术仍未突破,仍采用野外饲养方式,故受自然环境影响较大,不能保证稳产、高产.当前人工养殖河蟹成活率不足5%,人工放流回捕率不足0.7%.且肉质差,风味不及野生的;饲养周期长,两年后才能达到商品规格.本文介绍一种工厂化养殖河蟹的方法,即将河蟹的野外养殖引入室内进行主体养殖,并用人工控制河蟹的生长环境,再配以特殊的全价饲料,使饲养速度加快,饲养密度增高,同时也避免了河蟹的天敌伤害.用这种方法饲养,从蟹苗养成幼蟹的成活率为30—55%,大大高于人工野外养殖方式;成蟹回捕率达100%,饲养周期为原来的一半.用这种方法养殖的河蟹,蟹肉品质也好,口味正.此外还可进行全年全天候分批套养,提高设备利用
Crabs are of high economic value and belong to the high-grade vegetables confused.But due to the depletion of natural resources of crabs, human beings have to take countermeasures to study artificial breeding methods to increase the production of crabs .At present, despite the success of artificial breeding of crabs, farming techniques have not yet Breakthrough is still the use of wild feeding, it is affected by the larger natural environment, can not be guaranteed stable, high yield.Currently cultured crab survival rate of less than 5%, artificial discharge rate of return of less than 0.7%. And poor quality, less flavor than the wild; Feeding period is long and can reach the product specifications after two years.This article introduces a method of factory culture of crab, that is to introduce the crab’s field culture to the main body for indoor culture and control the growth environment of the crab by manual control together with the special full-price feed , So that raising speed, feeding density increased, but also to avoid the natural enemies of crab harm .In this method, the survival rate of crab raising crab from 30-55%, significantly higher than the artificial breeding methods; Crab catch rate of 100%, feeding cycle is half the original. Crab cultured in this way, crab quality Ye Hao, tastes are positive. In addition to all-weather points can be carried out throughout the year Set of support, improve equipment utilization