摘要
对中华虎头蟹Orithyia sinica幼体发育过程进行观察。结果表明:幼体发育分为4个主要时期,包括3期溞状幼体和1期大眼幼体。当海水盐度为28,水温为(25.1±0.8)℃时,Ⅰ期溞状幼体历时4～5 d发育至Ⅱ期溞状幼体,Ⅱ期溞状幼体历时4～5 d发育至Ⅲ期溞状幼体,Ⅲ期溞状幼体历时5～6 d发育至大眼幼体,大眼幼体经过5～6 d发育至Ⅰ期仔蟹,幼体自然孵化完成全部发育过程共需18～22 d。幼体大小、第1和第2颚足外肢羽状刚毛数目、尾叉棘刺数目、腹部肢芽大小是区分各时期溞状幼体的主要形态特征。
Larval development of tiger crab Orithyia sinica was observed under a light microscope at a water temper- ature of （25.1 ±0.8 ） ℃. It was found that 4 larval stages including 3 zoeal stages and 1 megalop stage were distin- guished by the first stage of juvenile crab. The larvae were hatched as a zoea （Z） which was metamorphosed into the first stage juvenile crab by 4 times of moult, during which Z I larvae developed into Z Ⅱ larvae in 4-5 days, Z Ⅱ larvae developed into Z Ⅲ larvae in 4-5 days, and Z Ⅲ larvae lasted for 5-6 days, then became megalop which molted into juvenile crab 5-6 days later. The whole process of larval development took place during 18-22 d. The developmental stages of the larvae were primarily distinguished by body size, number of hair and spine on the maxilliped and telson, and size of pleopodal buds.
出处
《大连海洋大学学报》
CAS
CSCD
北大核心
2012年第3期231-235,共5页
Journal of Dalian Ocean University
基金
辽宁省教育厅实验室专项(2008S062)
国家海洋局近岸海域生态环境重点实验室资助项目(201019)
辽宁省海洋与渔业厅科技计划项目(2011025)
辽宁省高等学校优秀人才支持计划项目(LJQ2011074)
大连市青年科技人才基金资助项目(2007J23JH023)
关键词
中华虎头蟹
幼体发育
形态特征
tiger crab Orithyia sinic
larval development
morphological character
