摘要
海蜇是我国沿海常见的一种经济价值较高的水母,碟状体是其生长发育的重要阶段。在实验室条件下,通过投饵频率(1、2和3次/d)、规格大小(D≤5、5<D<9、D≥9,D为伞径,mm)、光照时间(0、8、12、16和24h/d)和光照强度(自然光1405lx和弱光605lx)等4个因子对碟状体生长的影响进行实验。结果显示:伞径7mm左右的碟状体在温度21℃、盐度20、pH7.5、溶解氧量8.5~9.0mg/L的条件下每天足量投喂两次卤虫无节幼体即可满足其生长需求。不同规格的碟状体生长差异显著,伞径越小,生长率越大,生长速度越快。光照0、8和24h/d和光照12、16h/d碟状体的生长率差异显著;而0、8和24h/d之间无显著性差异;12和16h/d之间也无显著性差异,光照12h/d最有利于碟状体生长。自然光和弱光对碟状体生长无显著性差异。本文结论对海蜇碟状体生长阶段的生理学研究和人工养殖提供了科学依据。
Rhopilema esculenta is a common jellyfish with high economic value in the coastal areas in China.The ephyra is an important stage of its growth and development.Under laboratory conditions,the feeding frequency(1,2 and 3 times/d)of different specifications[D≤5;5<D<9;D≥9(D is the bell diameter)],light time(0 h,8 h,12 h,16 h and 24 h/d)and light intensity[natural light(1405 lx)and weak light(605 lx)]were used to study the effects of four factors on the growth of the ephyra.The results showed that the growth requirements of the ephyra with bell diameter of about 7 mm could be satisfied by feeding them twice a day under the conditions of temperature 21℃,salinity 20,pH 7.5 and dissolved oxygen 8.5-9.0 mg/L.The smaller the bell diameter,the higher the growth rate and the faster the growth rate.There were significant differences in the growth rate of ephyra at 0 h,8 h,24 h/d and 12 h,16 h/d(P<0.05).There was no significant difference between 0 h,8 h and 24 h/d(P>0.05).There was no significant difference between 12 h and 16 h(P>0.05),and 12 h/d light was the most favorable for the growth of ephyra.There was no significant difference between natural light and weak light on the growth of ephyra(P>0.05).The conclusion provides a scientific basis for the physiological study of growth stage and breeding technology of ephyra.
作者
高世科
陈岱
孙习武
范旸辰
张硕
GAO Shike;CHEN Dai;SUN Xiwu;FAN Yangchen;ZHANG Shuo(College of Marine Sciences,Shanghai Ocean University,Shanghai 201306,China;Jiangsu Tongzhouwan Fisheries Industry Development Co.,Ltd,Nantong 226007,Jiangsu,China;Joint Laboratory for Monitoring and Conservation of Aquatic Living Resources in the Yangtze Estuary,Shanghai 200000,China)
出处
《上海海洋大学学报》
CAS
CSCD
北大核心
2022年第2期394-399,共6页
Journal of Shanghai Ocean University
基金
上海市科委地方能力建设项目(21010502200)。
关键词
海蜇
投饵频次
光照
生长率
Rhopilema esculenta
feeding frequency
light
growth rate
