Abstract Knowledge of dispersal and migration of juvenile fish is essential for understanding the underlying processes responsible for population structure and recruitment variation. We explored the dispersal patterns of juvenile cod in waters around Iceland from putative nursery grounds to provide insights into their population structure. About 6000 juvenile cod were tagged at five inshore locations in 1993, 1997 and 2002. Of these, 767 juveniles were recaptured after 27–3297 days at liberty. The recaptures were weighted using standardized fishing effort and revealed high fidelity of juvenile cod to their putative nursery grounds. Cod tagged west of Iceland dispersed southwards to the main spawning grounds, south and southwest of Iceland, at the time of maturation. In contrast, juveniles tagged northwest of Iceland demonstrated no affiliation with the main spawning grounds. However, the juveniles tagged north of Iceland dispersed over a large geographical area and co-occurred in the same areas as those from areas northwest and west of Iceland during their third year at liberty. Different dispersal patterns for cod tagged at different locations indicated different life history strategies of Icelandic cod with limited mixing of juveniles followed by variable migration patterns towards spawning, supporting earlier studies showing the complexity of the population dynamics of the Icelandic cod.

中文翻译：

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幼鳕（Gadus morhua L.）在冰岛水域的扩散

摘要 幼鱼的散布和洄游知识对于理解导致种群结构和补充变化的潜在过程至关重要。我们从假定的育苗场探索了冰岛周围水域中幼鳕的散布模式，以深入了解它们的种群结构。1993、1997 和 2002 年，在五个近海地点对大约 6000 条幼鳕进行了标记。其中 767 条幼鳕在自由放养 27-3297 天后被重新捕获。使用标准化的捕捞努力量对重新捕获进行加权，并显示出幼鳕对其假定的育苗场的高保真度。冰岛西部的鳕鱼在成熟时向南分散到冰岛南部和西南部的主要产卵地。相比之下，标记在冰岛西北部的幼鱼与主要产卵场没有任何关系。然而，被标记为冰岛北部的青少年在自由的第三年分散在一个很大的地理区域，并与冰岛西北部和西部地区的青少年同时出现在同一地区。在不同地点标记的鳕鱼的不同散布模式表明冰岛鳕鱼的生活史策略不同，幼鱼混合有限，随后产卵的迁移模式不同，支持早期研究表明冰岛鳕鱼种群动态的复杂性。