EFFECT OF SALINITY ON LARVA OF EEDBLE MEDUSAE (RHOPILEMA ESCULENTA KISHINOUYE)AT DIFFERENT DEVELOPMENT PHASES AND A REVIEW ON THE CAUSE OF JELLYFISH RESOURCES FALLING GREATLY IN LIAODONG BAY
Abstract:Under the lab conditions, the effect of salinity in 2 to 31.42‰ on planula,scy-phistoma, ephyra and little medusae (involved their growth, development and survival) was observed. It was found that lower limit of salinity was 12‰ for the survival of planula, 10‰ for the survival of scyphistoma with. the optimum salinity range of 14 to 20‰, 8‰ for the survival of ephyra with the optimum range of 14 to 20‰ and 8‰ for the survival of little medusae.In the past fifteen years, there had been three times of decrea...