Challenges in assessments of Japanese eel stock
Challenges in assessments of Japanese eel stock
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DOI：
10.1016/j.marpol.2019.02.005
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发表时间：
2019-04-01
期刊：
影响因子：
3.8
通讯作者：
Kaifu, Kenzo
中科院分区：
文献类型：
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作者：
Kaifu, Kenzo
虽然日本鳗鱼（Anguilla japonica）是东亚最重要的鱼类之一，但迄今为止只有一项研究评估了日本鳗鱼种群。该研究主要根据日本的捕捞玻璃鳗、生长期黄鳗和成熟期银鳗的渔业数据，估计了该物种的资源状况和动态。这项研究还使用了日本鳗鱼和欧洲鳗鱼的生物学特性数据，如生长、成熟和自然死亡率。安圭拉，以制定一个按年龄和性别划分的生产模式。然而，日本的玻璃鳗鱼渔业统计数据并不是评估鱼量的适当数据来源，因为日本有不可忽视的非法和未报告的玻璃鳗鱼捕捞量。此外，日本的黄鳗鱼和银鳗鱼渔业数据受到放养个体数据的影响，尽管大部分数据是来自日本的鳗鱼，而不是物种分布范围内的其他国家和地区。除了数据收集中的这些问题外，生物参数可能会受到放养个体污染的影响。因此，很难使用基于日本鳗鱼渔业官方统计数据的年龄和性别结构生产模型来评估日本鳗鱼的库存状况。玻璃鳗渔业和鳗鱼贸易的合法性和可追溯性应得到改善，以便今后能够进行适当的种群评估，并应在整个物种分布范围内收集不进行鳗鱼放养的地区的单位努力量渔获量数据。
Although Japanese eel, Anguilla japonica, is one of the most important fish species in East Asia, only one study has assessed Japanese eel stocks to date. That study estimated the stock status and dynamics of this species mainly based on Japanese fishery data on recruiting glass eel, growing-phase yellow eel, and maturing silver eel. That study also used data on biological characteristics, such as the growth, maturity and natural mortality of both Japanese eel and European eel, A. anguilla, to develop an age- and sex-structured production model. However, Japanese fishery statistics for glass eel are not an appropriate data source for stock assessment because there are non-negligible illegal and unreported glass eel catches occur in Japan. Moreover, yellow and silver eel fishery data in Japan are biased by those pertaining to stocked individuals, although most of the data are for eels originating from Japan as opposed to other countries and regions within the species distribution range. In addition to these problems in data collection, the biological parameters might be biased by contamination from stocked individuals. Therefore, it is difficult to assess the stock status of Japanese eels using an age- and sex-structured production model based on official Japanese eel fisheries statistics. The legality and traceability of glass eel fisheries and eel trading should be improved to enable appropriate stock assessment in future, and data on catch per unit effort (CPUE) in areas where eel stocking is not conducted should be collected throughout the species distribution range.