Depletion of naturally recruited wild Japanese eels in Okayama, Japan, revealed by otolith stable isotope ratios and abundance indices

Depletion of naturally recruited wild Japanese eels in Okayama, Japan, revealed by otolith stable isotope ratios and abundance indices
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通过耳石稳定同位素比率和丰度指数揭示日本冈山自然招募的野生日本鳗鱼的枯竭

DOI:
10.1007/s12562-018-1225-2
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发表时间:
2018
期刊:
影响因子:
1.9
通讯作者:
Shirai Kotaro
Shirai Kotaro
中科院分区:
农林科学4区
文献类型:
--
作者:
Kaifu Kenzo;Yokouchi Kazuki;Higuchi Tomihiko;Itakura Hikaru;Shirai Kotaro

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为了解自然引入的野生日本鳗鱼的种群动态,以冈山县野生个体渔业资料为例进行了调查。利用最近开发的一种基于耳石稳定同位素的方法区分野生和放养鳗鱼。在放养鳗鱼的淡水区捕获的161条鳗鱼中,98.1%被识别为放养。相比之下,在没有放养鳗鱼的沿海地区捕获的128条鳗鱼中,82.8%被视为野生鳗鱼。2003至2016年间,在大多数鳗鱼被视为野生鳗鱼的沿海地区,单位捕捞努力的延绳钓和固定渔获量大幅下降,这表明这些水域的野生日本鳗鱼持续枯竭。
To investigate the population dynamics of naturally recruited wild Japanese eels, fisheries data of wild individuals in Okayama Prefecture were investigated as a case study. Wild and stocked eels were discriminated using a recently developed method based on otolith stable isotopes. Of the 161 eels captured in freshwater areas where eels had been stocked, 98.1% were discriminated as stocked. In contrast, 82.8% of 128 eels captured in coastal areas where eels are not stocked were discriminated as wild. There was a significant decrease in longline and set-net catch per unit effort between 2003 and 2016 in the coastal areas where most eels were discriminated as wild, indicating ongoing depletion of wild Japanese eels in these waters.
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