Donax trunculus is a much‐appreciated commercial clam whose natural populations have been overexploited in southern–western Spain during the last decades. In order to control the decrease of natural beds, local governments establish annual closed seasons based on socioeconomic reasons, such as economic necessity or tourism interest. The objective of this study was to develop an efficient tool for predicting gonadal stages based on environmental condition data. This tool will allow for an improvement in fishery management since in this manner the closed season can be based on the reproductive cycle. The natural population's reproductive cycle was studied for more than 2 years. The obtained gonadal and condition indexes (GI and CI) values were statistically related to environmental conditions, specifically surface seawater temperature (SST) and chlorophyll‐a (Chlo‐a) levels with these data being provided from satellite remote sensing observations (SRS). The best statistical relationship was obtained between GI and the SST registered 60 days before bivalve sampling (SST‐60). The regression equation allows for an estimate of GI value based on the SST‐60 and, as each value is related with one gonadal stage (resting, maturation, ripe), for prediction of the reproductive cycle. Therefore, the closed season can be established when most of the population is in the ripe stage and can be adjusted taking into account the possible temperature variations across the years. For ease of use, GI values estimated with this tool have also been converted using different colours onto a map of wedge clam reproductive stages in its natural beds.

中文翻译：

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改善双壳类渔业管理：根据卫星遥感观测的环境数据，开发一种预测双壳类繁殖季节的工具

竹trunculus是一种备受赞赏的商业蛤lam，在过去的几十年中，西班牙西南部的自然种群被过度开发。为了控制自然床的减少，地方政府根据社会经济原因（例如，经济必要性或旅游兴趣）建立了年度封闭季节。这项研究的目的是开发一种基于环境条件数据来预测性腺阶段的有效工具。该工具将改善渔业管理，因为以这种方式，休渔季节可以基于繁殖周期。对自然种群的生殖周期进行了2年以上的研究。获得的性腺和状况指数（GI和CI）值在统计上与环境状况相关，特别是地表海水温度（SST）和叶绿素一个（Chlo-一个）与这些数据的水平从卫星被提供遥感观测（SRS）。在双壳取样之前60天（SST-60），GI和SST之间获得了最佳的统计关系。回归方程可以根据SST-60估算GI值，并且由于每个值与一个性腺阶段（静止，成熟，成熟）相关，因此可以预测生殖周期。因此，可以在大多数人口处于成熟阶段时建立封闭季节，并可以考虑多年来可能出现的温度变化来进行调整。为了易于使用，使用此工具估算的GI值也已使用不同的颜色转换为自然床中楔蛤繁殖阶段的地图。