Abstract

In this study, we present an innovative framework to obtain essential biological knowledge on exploited populations, based on fine scale spatio-temporal resolution in biological and fishery data. The framework uses species sales notes by commercial size category, the length and age composition of commercial sizes from onshore sampling and the fishing ground and fishing effort from vessel monitoring system records. We apply the framework to horse mackerel (Trachurus trachurus), one of the most important commercially exploited stocks throughout the Northeast Atlantic, using data collected during 2017 in Portuguese waters. We show that high-resolution mapping of the species annual landings by commercial size category and age group can already reveal different distribution patterns by life stage. We further examined, with daily resolution, the variability in the proportion of adult fish by trip, finding differences along the coast and a seasonal pattern indicating that spawning occurred mainly over the slope and adult horse mackerel dominated in the South zone over the year. The framework can be applied to an extended stock area and for several years to investigate migration patterns across areas as well as intra- and inter-annual changes in the species overall distribution. In addition, its application on a trip basis for the species ensemble landed can provide overriding information for the accuracy of mixed fisheries models and management.

中文翻译：

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基于每日分辨率数据调查渔业动态，物种规模和年龄时空分布模式的框架：以东北大西洋鲭鱼为例的研究

摘要

在这项研究中，我们提出了一个创新的框架，以在生物和渔业数据中的时空尺度精细分辨率为基础，获得有关被开发种群的基本生物学知识。该框架使用按商业规模类别划分的物种销售记录，陆上采样，渔场和船舶监测系统记录中的捕捞努力量的商业规模的长度和年龄组成。我们将该框架应用于竹荚鱼（Trachurus trachurus），这是整个东北大西洋地区最重要的商业开发种群之一，使用了2017年在葡萄牙水域收集的数据。我们显示，按商业规模类别和年龄组划分的物种年度着陆的高分辨率地图已经可以揭示生命阶段的不同分布方式。我们以每日分辨率进一步检查了成年鱼类在旅途中所占比例的变化，发现沿海地区的差异和季节性模式表明产卵主要发生在坡度上，一年中南部地区的成年鲭鱼占主导地位。该框架可适用于扩展的种群区域，并可以用于调查跨区域的迁移模式以及物种总体分布的年内和年际变化。此外，