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单体网箱(直径8.5厘米×高21厘米)的箱壁用网片制成,网箱的顶部和底部用塑料材料。网箱放在温度为29℃、盐度2‰的循环水系统中养殖罗氏沼虾(Macrbrachium rosenbergii)后期幼体,在喂饲料充足的情况下,存活率接近或达到100％。沼虾从平均尺寸0.01克(眶后长度9毫米),生长至0.5克～0.9克,(30～36毫米)需12周。有关研制该系统中可能出现的重金属毒性也将在本文阐述。单体网箱养殖水生甲壳动物往往出于试验目的,因此同类相残或其它习性的干扰不会影响试验结果。这里介绍单体网箱水循环系统。该系统在12周的营养试验中成功地培育了罗氏沼虾后期幼体亚洲巨虾。网箱采用实底结构以便收集粘结度很差的沉淀残饵,而后将其分别清除。这一结构便于通过翻转和排空网箱收获后期幼体,也便于定期清洗。其它系统的网箱多是采用网片或穿孔底结构,因此网箱不能分别挪动。(1978年Ven Olit和1978年Carlberg;1979年Boghen和Castell;1981年Conklin等;1981年Fairfull等)。
Single cages (8.5 cm in diameter x 21 cm in height) are made of mesh with plastic mesh on the top and bottom. Cages were housed in late-stage larvae of Macrobrachium rosenbergii in a recirculating-water system at a temperature of 29 ° C and a salinity of 2 ‰. Survival rates approached or reached 100% with sufficient feed. Macrobrachium grows from an average size of 0.01 g (orbital length 9 mm) to 0.5 g to 0.9 g (30 to 36 mm) for 12 weeks. The toxicological implications of developing heavy metals in this system will also be addressed in this paper. Monocaged Cages Aquaculture Crustaceans are often used for experimental purposes, so disruptions of the same type or other habits do not affect the test results. Here is a single cages water circulation system. The system successfully cultivated late-stage larval Asian giant shrimp Macrobrachium rosenbergii in a 12-week trial of nutrition. Cages use a solid structure to collect poorly settled sediment bait, and then remove them separately. This structure facilitates the harvesting of late larvae by inverting and emptying cages and also facilitates regular cleaning. Cages in other systems mostly use mesh or perforated bottom structure, so the cages can not be moved separately. (Ven Olit, 1978 and Carlberg, 1978; Boghen and Castell, 1979; Conklin et al, 1981; Fairfull, 1981 et al.).