Basic studies on resource enhancement for king crab

王蟹（Paralithodes camtschaticus）、短叶王蟹（p.b brevipes）和鸭嘴兽（p.a platypus）孵化为海蛸，并蜕变为青光眼。在本研究中，首先通过培养实验证明了青花的不取食性。青光眼期食物对青光眼成活率有影响；以培养硅藻（thalassisira sp.）和野蒿（Artemia nauplii）联合喂养组存活率较高。硅藻含有约18%的脂质，其中含有一定量的EPA。其次，对前肠和口器进行了详细观察；幼龙的前肠有大量刚毛，第一幼龙形成胃磨齿和侧齿，而青光眼的前肠无毛，很少有小刚毛。第三，研究了青光石的代谢机制；青光眼和早期青光眼中肠腺（MGG）、中肠腺前盲肠（AC）和中肠（MG）的脂滴较大，青光眼晚期AC萎缩，MGG和MG拉长，脂滴较小。脂质含量在青光期急剧下降。

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.