增氧与投饵对海蜇足囊萌发的影响

对久置海蜇(Rhopilema esculentum Kishinouye)螅状体足囊在不同培养条件下的萌发状况进行了为期1个星期的连续观察.结果表明,海蜇进行横裂生殖苗种生产后的附着基,弃置3个月后其上的足囊仍然具有萌发能力.这些足囊在投饵并充气增氧、仅充气增氧不投饵、仅投饵不充气增氧3种情况下的萌发率分别为69.08%、48.83%、34.90%,充气增氧情况下的足囊萌发率显著高于不充气增氧的情况(P<0.01),投饵情况下的足囊萌发率高于不投饵的情况.结果说明,足囊作为海蜇度过不良环境条件的一种有效策略,其萌发与否在海蜇足囊繁殖过程中更为重要.在溶解氧含量并不成为限制因素的情况下,充气增氧所带来的涡旋水流刺激是促进海蜇足囊萌发更主要的因素,可能和所投喂饵料的体外分泌物一样成为食物丰歉程度的一种信号,进而促进或诱发海蜇足囊的萌发.本研究旨在探讨提高海蜇足囊前发率的有效手段,为提高海蜇苗种培育效率提供基础依据.

Effects of aeration and feeding on podocyst germination of jellyfish, Rhopolema esculentum Kishinouye

were abandoned three months after strobilation, these podocysts can still germinate. These podocyst were treated in three conditions, including feeding and aeration, and only aeration, only feeding. The rate of podocyst germination were 69.08%, 48.83% and 34.90%, respectively. According to the results, aeration significantly promoted the podocyst germination of , and the rate of podocyst germination with feeding was higher than that of no feeding group. As a strategy to for passing through adverse conditions, podocysts germination was more important to the asexual reproduction progress by podocyst. When dissolved oxygen content was not the limiting factor for the podocyst germination in this experiment, turbulence current by aeration eight be the main factor to promote prodocyst germination, which was the same as the turbulence current made by zooplankton to some extent. Although the prodocyst of can not eat any food, some secretions in vitro by food may be a motivator to induce the prodocyst germination of , which is same as the turbulence current by aeration. The mechanism of prodocyst germination of needs further researches