EFFECTS OF LIGHT INTENSITY ON ASEXUAL REPRODUCTION OF THE SCYPHOZOAN CYANEA NOZAKII KISHINOUYE
光照强度对白色霞水母(Cyanea nozakii Kishinouye)无性繁殖的影响

The effect of light intensity on asexual reproduction of Cyanea nozakii Kishinouye was investigated. Relative growth rate, specific growth rate of scyphistomae and scyphistomae cysts reproductive rate exposed to 400 lx were significantly higher than those exposed to other treatments (P<0.05). The result was 400 lx > 800 lx > 1200 lx > 0 lx. The occurrence of scyphistomae cysts reproduction delayed as the light intensity decreased from 400 lx to 0 lx. Podocyst germination rate was highest in 800 lx, and no significant difference was observed among different groups (P>0.05). The strobilation rate was highest in 400 lx and lowest in 0 lx during the experiment. Suitable light intensity might accelerate the growth, scyphistomae cysts reproduction, and strobilation.