Mean length and weight at-age of anchovy and sardine estimated during the PELGAS survey in the Bay of Biscay in springtime

the pélagiques gascogne (pelgas, doray et al., 2000) integrated survey aims at assessing the biomass of small pelagic fish and monitoring and studying the dynamics and diversity of the bay of biscay pelagic ecosystem in springtime. pelgas has been conducted within the eu common fisheries policy data collection framework and ifremer’s fisheries information system. details on survey protocols and data processing methodologies can be found in doray et al., (2018a, 2021).this dataset comprises the mean length-at-age (cm) and weight-at-age (g) estimated annualy since 2000 for anchovy and sardine, based on pelgas survey data. both indices were weighted by fish abundance per length class, and are provided with an estimation error (coefficient of variation in %). indices were produced following a standard methodology implemented in the echor r package (doray et al. 2013).those estimates have been validated by the ices wgacegg group and provided to the ices wghansa group for stock assessment purposes. data have been used in doray et al., 2018b.

Gascony 海洋生物调查（简称 Pélagiques Gascogne，Pelgas，Doray 等人，2000 年）的整合调查旨在评估小型浮游鱼类的生物量，并监测与研究春季 Bay of Biscay 浮游生态系统的动态和多样性。Pelgas 调查是在欧盟共同渔业政策数据收集框架和 Ifremer 渔业信息系统内进行的。调查协议和数据处理方法的详细信息可参见 Doray 等人（2018a，2021 年）。本数据集包含了自 2000 年以来根据 Pelgas 调查数据估计的鲱鱼和沙丁鱼的年均长度-年龄（厘米）和重量-年龄（克），这两个指数均按长度类的鱼类丰富度进行了加权，并提供了估计误差（变异系数，百分比）。这些指数是根据在 echor R 包中实施的标准方法生产的（Doray 等人，2013 年）。这些估计值已由 ICES WGACEGG 小组进行验证，并提供给 ICES WGHANSA 小组用于资源评估。数据已在 Doray 等人（2018b）的研究中使用。