Linfen fresh water rotifera class institute 临汾淡水轮虫类的调查
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The preliminary investigation on populations of rotifera in the star lake of chongqing 重庆卫星湖轮虫种群的初步调查
3.
After molting three times , the zoea enter the mysis stage during which they begin to look more like adult shrimp and swim in a characteristic fashion with head and tail pointed downwards at right angles and occasionally performing a sudden retrograde jumping action . this is known as the inversion state , the fry being suspended upside - down in the upper middle region of the pond water . this is , therefore , also called the " inverted suspension phase " 眼幼虫脱第三次即进入糠虾期幼虫期mysis stage ，此期之体形已略成虾之状态，且具特有之游泳姿态，即头部及尾部均向下，成一直角弯曲而时作向后跳跃游动，又因成倒立状态，悬浮于水中的中上层，又叫倒吊期，此期幼虫对外界的环境因素，如水温盐分等变化，比前两期来得更具适应力，主要饵料为丰年虾brine shrimp的幼虫，但其他大小略同的动物性浮游生物，如桡脚类copepoda轮虫类rotifera均可。
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The main feed at this time consists of brine shrimp larvae , oyster eggs and diatoms spiruline , skeletonema costatum . however other zooplankton such as copepoda and rotifera can also be used . during the mysis stage the bodies of the fry become larger and so are able to ingest the nauplii of the brine shrimp along with spirulina and 糠虾期幼虫个体较大，已能摄食丰年虾无节幼虫，拌用螺旋藻，虾苗丹喂饲，其存活率有意想不到的好，将螺旋藻与丰年虾无节幼虫，虾苗丹等配合一起喂饲，其存活率高的原因，在于丰年虾无节幼虫亦能摄食螺旋藻虾苗丹，可增加丰年虾无节幼虫的存活率，不仅能节省丰年虾外，又能避免水质恶化不需要常换水。
