Body size plays a key role for the productivity and resilience of marine populations. This work analyses the variation in body size indicators taken from ~ 400 000 individuals during the period 2000–2018 for a set of 20 key commercial species of the small-scale fishery of Galicia (SW Europe). Mean body size showed relatively stable inter-annual trends during the study period, and, at the year level, mean body size for most species followed seasonal cycles. Body size was negatively related to the number of individuals caught per haul. Bathymetry also explained part of the variation in individual body size with species-specific depth affinities. Common trends in the species’ body size showed an increasing trend in the northern region while decreasing in the south suggesting differences in local environmental conditions and/or in the dynamics of the fishery. The skewness of body size distributions varied slightly from year to year, although some species showed significant trends. The annual trend of the species-specific skewness was negatively related to the proportion of immature individuals in the catch and positively related to the rate of change in abundance, suggesting a reduction of recruitment success in response to differences in size-selective exploitation patterns probably ascribed to minimum landing size being generally below size at maturity. The combination of body size and abundance indicators revealed a relatively stable performance of some of the most important resources targeted by the Galician small-scale fishery sector during the last two decades. However, our study highlights also the need to align management measures with biological reference points in order to prevent long-term reductions in stock productivity.

体型对海洋人口的生产力和复原力起着关键作用。这项工作分析了2000-2018年间，针对加利西亚（SW Europe）的20种关键商业鱼类的集合，从大约40万个体中获取的体型指标的变化。在研究期间，平均体型显示出相对稳定的年际趋势，在年水平上，大多数物种的平均体型遵循季节周期。身体大小与每次拖网捕获的人数成负相关。测深法还解释了个体体重随物种特定的深度亲和力而变化的部分原因。物种体型的共同趋势在北部地区呈上升趋势，而在南部地区则呈下降趋势，表明当地环境条件和/或渔业动态存在差异。尽管某些物种显示出明显的趋势，但每年的体形分布偏度略有不同。物种特定偏度的年度趋势与渔获物中未成熟个体的比例呈负相关，与丰度变化率呈正相关，这表明对可能归因于大小选择开发模式差异的招聘成功率降低到最小着陆尺寸通常低于成熟时的尺寸。体型和丰度指标的组合显示了过去二十年来加利西亚小型渔业部门所针对的一些最重要资源的相对稳定表现。但是，我们的研究还强调，有必要使管理措施与生物学参考点保持一致，以防止长期降低种群生产力。