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四指马鲅(Eleutheronema tetradactylum)受精卵和仔鱼对不同盐度的耐受性

谢木娇1,2,区又君1,温久福1,李加儿1*,王鹏飞1,周慧1,2,刘奇奇1,2   

  1. (1中国水产科学研究院南海水产研究所, 农业部南海渔业资源开发利用重点实验室, 广州 510300; 2上海海洋大学水产与生命学院, 上海 201306)
  • 出版日期:2016-05-10 发布日期:2016-05-10

Salinity tolerance of fertilized eggs and larva of Eleutheronema tetradactylum.

XIE Mu-jiao1,2, OU You-jun1, WEN Jiu-fu1, LI Jia-er1*, WANG Peng-fei1, ZHOU Hui1,2, LIU Qi-qi1,2#br#   

  1. (1Key Laboratory for Exploitation & Utilization of Marine Fisheries Resource in South China Sea, Ministry of Agriculture; South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China; 2 College of Fisheries and Life Sciences, Shanghai Ocean University, Shanghai 201306, China).
  • Online:2016-05-10 Published:2016-05-10

摘要: 本文观察了11个盐度梯度(5、7、9、11、13、15、20、25、28、30、35、40、45,28作为对照组)下四指马鲅(Eleutheronema tetradactylum)不同发育阶段的受精卵的沉浮性质和孵化情况以及初孵仔鱼在不投饵条件下的存活情况,并测定不投饵存活系数(survival activity index,SAI)。结果表明:第一次分裂前和原肠期两发育阶段的受精卵在盐度低于25的海水中均呈沉性,盐度为25时则悬浮在水层中部,盐度28及以上呈浮性;第一次分裂前的受精卵对盐度改变较敏感,而原肠期受精卵对盐度胁迫产生一定的耐受性;盐度的改变对初孵仔鱼的存活率和SAI值影响比较大。综合分析孵化率、仔鱼畸形率以及SAI值,推测四指马鲅受精卵孵化的适宜盐度范围为25~35,最适孵化盐度为35。

关键词: 碳储量, 凋落物, 红树林, 净初级生产力, 生物量

Abstract: This study was conducted to investigate the effects of salinity levels on the sinking, buoyancy, hatching and abnormal rate of fertilized eggs of Eleutheronema tetradactylum under a salinity gradient of 5, 7, 9, 11, 13, 15, 20, 25, 28 (as control), 30, 35, 40, 45. Furthermore, the survival activity index (SAI) of larval E. tetradactylum was observed. The results showed that both fertilized eggs in the stages before the first division and the gastrula sank at salinity below 25, suspended in the central layer when the salinity was 25, and floated at salinity of 28 or more. Fertilized eggs before the first divisions were more sensitive to salinity change than those in the gastrula stage. Survival rate and SAI value of newly hatched larva were significantly impacted by salinity change. Based on hatching rate, abnormal rate of larva and SAI value analysis, it is speculated that the suitable salinity range of E. tetradactylum fertilized egg hatching is 25-35, and the optimum value is 35.

Key words: net primary productivity, carbon stock, mangrove, biomass, litterfall.