In this study, logbook, landings, and vessel monitoring system data of German brown shrimp (Crangon crangon L.) fishers were combined to analyse spatial and temporal distribution patterns. Landings per unit effort (LPUE) were standardized to the efficiency level of a reference vessel. The standardization altered the spatial–temporal patterns of the LPUE as the vessels differed by a factor of up to 4.7. LPUE data were separated into two size classes according to sieve fractions. Small brown shrimps were characterized by LPUE values increasing early in the year in shallow waters, especially in estuaries in July. Subsequently, peak LPUE values are reached at the end of September in all depths, but with variable spatial patterns between years. LPUE data indicate a general outward migration between early summer and winter. In winter, large shrimp shows a clear increase in LPUE with depths mainly in regions adjacent to the Dutch coast and a reversed pattern close to the Danish coast. The large size class in winter—which consists mainly of mature or egg-bearing females—showed high LPUE values along two persistent diagonal bands in the German Bight. These patterns could lead to local recruitment overfishing, if fishermen are aware of such patterns.

中文翻译：

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根据商业记录，着陆和船只监测数据得出的棕色虾（Crangon crangon）的时空分布格局

在这项研究中，德国褐虾（Crangon crangon）的日志，着陆和船只监视系统数据L.）渔民被结合起来分析时空分布格局。每单位着陆量（LPUE）的标准化已达到参考船的效率水平。标准化改变了LPUE的时空格局，因为船只相差最大4.7。LPUE数据根据筛分分成两个大小类别。小棕虾的特征是，年初时，浅水区的LPUE值增加，特别是7月的河口。随后，所有深度的LPUE峰值均在9月底达到，但年份之间的空间格局变化。LPUE数据表明初夏和冬季之间普遍向外迁移。在冬季，大虾显示LPUE明显增加，其深度主要在荷兰海岸附近的区域，而在丹麦海岸附近的模式则相反。冬季的大型班级-主要由成年或产卵的雌性组成-在德国湾的两个持续对角带上显示出较高的LPUE值。如果渔民意识到这种模式，这些模式可能导致当地招募过度捕捞。