期刊
FISHERIES RESEARCH
卷 199, 期 -, 页码 36-43出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.fishres.2017.11.024
关键词
Ecological indicators; Maximum Sustainable Yield MSY; Angling; Biological Reference Points BRP; ICES WKLIFE; Stock assessment
类别
资金
- Natural Resources Wales (UK)
- Inland Fisheries Ireland
- Department of Environment, Food and Rural Affairs (UK)
2 Many populations of diadromous fish have declined, but data are limited and there are very few quantitative stock assessments. Length-based indicators (LBIs) and reference points (RPs) have been proposed for assessment of data-poor fish stocks. It is likely that RPs will need to be tuned for fish with 'unusual' life history traits such as diadromy. Long-term records of the size-distribution of the catch in the rod fishery, and in a fisheries-independent trapping programme are available for sea trout Salmo trutta stocks from the River Dee (Wales, UK). These data were used to estimate a length-based harvest rate (LHR) and a suite of LBIs for the fishery. Appropriate RPs (with uncertainty) were derived for length-based assessment of sea trout. The LBIs and a decision tree suggest that the stock is likely to be sustainably exploited with regard to length-based and a spawner biomass RP. Increasing the overall harvest rate would result in a greater proportion of rare very large sea trout being taken by anglers. Appropriate length-based RPs for sea trout differ to those proposed for marine demersal species. Expected values for the proportion of megaspawners in the catch are very low, which may be explained by fishing gear (hook and line) selection and the cost of multiple spawning migrations in diadromous fish.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据