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首页> 外文期刊>Aquaculture Research >Enhancement of survival and growth in crowded groups: the road towards an intensive production of the noble crayfish Astacus astacus L. in indoor recirculation systems.
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Enhancement of survival and growth in crowded groups: the road towards an intensive production of the noble crayfish Astacus astacus L. in indoor recirculation systems.

机译：在拥挤的人群中提高生存和生长：在室内再循环系统中集约化生产小龙虾Astacus astacus L.的道路。

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High mortality from cannibalism in crowded cultures of the noble crayfish (Astacus astacus L.) was the reason why the efforts for an intensive production of this species in the 1980 s were largely stopped. In the present study, 14- to 15-month-old juveniles of A. astacus were cultured in tanks of an indoor recirculation system under constant 'summer conditions' (19 degrees C, LD 16:8) from early August to late January. The animals continued to moult and grow, indicating that the absence of these processes in the field from autumn to late spring does not involve any endogenous programming. The experimental design (suitable hiding places in excess, highly diversified diet, and special daily and lunar light regimes) ensured high survival (>90%) and growth rates which were largely independent of stocking rate (15-60 individuals per m2). Moulting occurred during daytime which allowed freshly moulted animals to escape from cannibalistic attacks of their nocturnal conspecifics. There is a first indication that an artificial moonlight cycle can synchronize moulting events (maximum around 'new moon'), in this way contributing to a further decrease in mortality. The results encourage a resumption of efforts for an intensive production of A. astacus in indoor recirculation systems.Digital Object Identifier http://dx.doi.org/10.1111/j.1365-2109.2011.03052.x
机译：在拥挤的贵族小龙虾（Astacus astacus L.）养殖中，自相残杀导致的高死亡率是在1980年代停止大量生产该物种的努力的原因。在本研究中，从8月初到1月下旬，在恒定的“夏季条件”（19摄氏度，LD 16：8）下，将14至15个月大的A. astacus幼虫在室内循环系统的水箱中进行培养。这些动物继续蜕皮和生长，这表明从秋季到春末田间没有这些过程并不涉及任何内源编程。实验设计（适当的藏身处有多余的地方，高度多样化的饮食以及特殊的日照和农历光照制度）确保了高存活率（> 90％）和增长率，很大程度上与放养率无关（每m 15-60个人） 2 ）。换羽发生在白天，这使得刚换羽的动物从夜间同种异食的食人性攻击中逃脱。有第一个迹象表明，人工月光周期可以使换毛事件（“新月”附近最大）同步，从而进一步降低了死亡率。结果鼓励在室内再循环系统中重新投入大量生产紫檀的努力。数字对象标识符http://dx.doi.org/10.1111/j.1365-2109.2011.03052.x

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