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首页> 外文期刊>ICES Journal of Marine Science >Spatial variation in abundance and catch composition of Cancer pagurus in Norwegian waters: biological reasoning and implications for assessment
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Spatial variation in abundance and catch composition of Cancer pagurus in Norwegian waters: biological reasoning and implications for assessment

机译：挪威水域巨蟹的丰度和捕获组成的空间变异：生物学推理和评估意义

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摘要

The edible crab (Cancer pagurus), which is abundant along the Norwegian coast north to Troms County, has been exploited in Norway since the start of the 20th century. The main fishery is in Mid-Norway and Helgeland (63 °-67 ° N), which together land 75% of the Norwegian catch. The fishery is regulated by season, minimum legal size, and the discarding of soft or ovigerous females. Catches have never been systematically described, so this study presents data collected over 4 years by a reference fleet of professional fishers reporting the catch from four standardized trial traps set among their ordinary traps. Catch rate, catch composition, and size distribution from Mid-Norway/Helgeland are compared with the smaller crab fishery in Rogaland (59 °N) and with new crab grounds off Vesteralen (69°N). Local variations in size and sex composition between and within region seemed partly to be caused by differences between exposed and sheltered regions, and between heavily and newly exploited grounds. Size distribution is used as an indicator to determine a suitable sampling strategy. The most efficient survey design is seemingly the collection of relatively small samples from many boats to reduce the between-vessel component of variation. A suggested strategy to obtain an abundance index would be to collect daily catch rates from all commercial landings.
机译：自20世纪初以来，可食用蟹（Cancer pagurus）就在挪威沿海北部特罗姆斯县北部丰富，一直在挪威开采。主要渔业在挪威中部和海尔格兰德（63°-67°N），它们合计占挪威渔获量的75％。渔业受季节，最小法定规模以及丢弃软弱或有活力的雌性的限制。渔获量尚未得到系统的描述，因此，本研究提供了由专业渔民参考船队在4年内收集的数据，这些渔民报告了从其普通捕捞装置中设置的四个标准化试验捕捞装置获得的渔获量。将挪威中部/ Helgeland的渔获率，渔获物成分和大小分布与Rogaland较小的蟹类渔业（59°N）和Vesteralen以外的新蟹基（69°N）进行了比较。区域之间和内部的大小和性别组成的局部差异似乎部分是由于裸露和庇护区域之间以及重度和新开发土地之间的差异引起的。大小分布用作确定合适采样策略的指标。看来，最有效的调查设计是从许多船上收集相对较小的样本，以减少船间差异。建议的获取丰度指数的策略是收集所有商业降落的每日捕获率。

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