Basic studies on resource enhancement for king crab

帝王蟹Paralithodes Camtschaticus、P.brevipe和P.platypus孵化为带状动物，并变质为蓝藻。在本研究中，首先，通过培养实验，确定了蓝鲸不投喂的条件。带状幼体阶段的摄食影响蓝藻的存活率，摄食培养的海链藻成活率较高。(硅藻)和卤虫无节幼体。硅藻含有约18%的脂类，其中含有大量的EPA。其次，前肠和口器被详细观察到，在带状动物的前部有大量的刚毛，第一代幼体形成胃磨和侧齿，而在蓝藻的前肠中没有武装，很少有小的刚毛。第三，研究了蓝藻的代谢机制，在中肠腺(MGG)、中肠腺、盲肠前(AC)和中肠(MG)观察到大型脂滴，而在晚期，AC萎缩，MGG和MG延长，脂滴较小。脂类含量在青胶期急剧下降。

King crab Paralithodes camtschaticus, P.brevipes and P.platypus hatch out as zoea and metamorphosed into the glaucothoe. In the present study, first, non-feeding of glaucothoe was shown by culture experiment. Food during zoea stage effects survival rate of the glaucothoe ; better survival was shown for the group fed cultured Thalassiosira sp. (diatom) and Artemia nauplii, in combination. The diatom contained about 18% lipids which comprised a quantity of EPA.Second, the foregut was observed in detail as well as the mouthparts ; numerous setae are present in the foregut of zoea, and gastric mill and lateral teeth were formed in the first juvenile, while in the glaucothoe forgut was unarmed with few small setae. Third, metabolic mechanism for the glaucothoe was investigated ; large lipid drops were observed in midgut gland (MGG), midgut gland anterior caecum (AC) and midgut (MG) for the zoea and early glaucothoe, while atrophied AC and elongaed MGG and MG with small lipid droplets for the late glaucothoe. Lipids content showed a drastic decrease during the glaucothoe stage.