桃花水母生活史的实验观察

Laboratory Observations on the Life Cycle of Craspedacusta xinyangensis

记录了中国产信阳桃花水母(Craspedacusta xinyangensis)的生活史及各阶段主要发育特征。25～28℃条件下,卵受精23h后发育成长0.14～0.21mm的圆棍状浮浪幼虫,养殖环境下,浮浪幼虫在水中漂浮3～5d后固定到人工玻璃底质上,3～4d后发育成长度0.3～0.6mm的螅状体。水螅体产生无纤毛的类浮浪幼虫形成新的螅状体。一个螅状体成熟后产生一个水母芽,新释放的幼水母具有16只触手。

The life history and main development characteristics of different development stages of Craspedacusta xinyangensis were recorded. Under the condition of 25-28℃ ,the eggs would develop into 0. 14-0. 21 mm long,stick shape planula 23 h after fecundation. Under the experimental condition,The planula would float in the water for 3-5 days and then stayed on the bottom of the glass container. In the following 3-4 days,they would develop into a 0. 3-0. 6 long hydranth. The hydranth would reproduce unciliated frustule which would reproduce new hydranth. After the hydranth reached the maturation, only one medusa bud would be reproduced. The newly released young medusa had 16 tantacle.