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How do eggs and larvae come to nursery beyond front?

卵和幼虫如何来到前面的育苗室？

基本信息

批准号：
08660223
负责人：
MATSUSHITA Katsumi
金额：
$ 1.41万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08660223/
关键词：
Japanese anchovy Recruitment Drift card 初期生活史輸送浮遊卵資源変動漂流ハガキ

项目摘要

Most pelagic fish spawn their eggs at offshore area but the nursery is usually coastal area. We sometimes detected the patches of eggs and larvae at the frontal area as like they were induced to stay at the front. How do the eggs and larvae enter and/or entrainment nursery beyond the front?I suspected the recruitment success of white bait fishery may be influenced by the entrainment from offshore spawning area beyond the front. The catch of white bait fishery is very fluctuate though the spawning potential is constant. I evaluated the entrainment by using 4 methods.(1)grid survey the distribution and abundance of eggs at frontal area by HCPS.(2)grid survey the distribution and abundance of eggs at offshore area by CPS.(3)spawning daily population index of white bait fishery by otolith analysis.(4)drift card return ratio to the coastal area.The HCPS grid survey lines were araanged to cross the front, then I could detect the front and anchovy eggs patches accumulated along frontal area. At the same time. the drift cards were thrown at each continuous station. The survey of offshore distribution of eggs were also carried out by CPS.Furthermore, I collected anchovy larvae of white bait fishery and the data of catch per haul each 5 days between 10-30 days period after eggs distribution survey. The collected larvae were analyzed the otolith and estimated the birth date. Then, I could estimate the spawning daily population index of the day of eggs distribution survey. The spawning daily population index is not directly correlated to the abundance of eggs at frontal area. The drift card return ratio to the coastal area is more important to predict the spawning daily population index. Then, I supposed the recruitment success of white bait fishery is influenced by the physical entrainment.

大多数中上层鱼类产卵在近海地区，但托儿所通常是沿海地区。我们有时会发现卵和幼虫在前部区域的斑块，就像它们被诱导留在前部一样。卵和幼虫如何进入和/或夹带苗圃超过前面？我怀疑白色诱饵渔业的补充成功可能受到来自前方近海产卵区的夹带的影响。白色饵渔业的产卵势是恒定的，但渔获量波动很大。我用4种方法评价了夹带。（1）利用HCPS对锋面区域的虫卵分布和丰度进行网格调查。（2）利用CPS对近岸海域鱼卵的分布和丰度进行网格化调查。（3）白色饵鱼产卵日种群指数的耳石分析。（4）漂流卡对海岸的回报率：HCPS网格测线布置成与锋交叉，可以探测锋和沿着锋区积累的鱼卵斑块。同时还研究与讨论在每个连续的站处投掷漂移卡。此外，在卵分布调查后的10-30天期间，我每5天收集一次白色诱饵渔业的幼鱼和渔获量数据。采集幼虫进行耳石分析，估计出生日期。进而估算出产卵日种群指数。产卵日种群指数与锋面产卵量无直接关系。漂流卡返回到沿海地区的比例是更重要的预测产卵日人口指数。由此推测，物理夹带对白色饵渔业的补充效果有一定的影响。