We evaluated natural mortality (M yr⁻¹) estimation reliability for eastern Aleutian Islands male golden king crab (Lithodes aequispinus), an exploited stock, by comparing an integrated length-based assessment model approach and a likelihood method using tag release-recapture data. We used 1997, 2003, and 2006 tag release-recapture data to estimate the size transition matrix, M, fishing mortality, total selectivity, and retained selectivity and compared M likelihood profiles between both methods. Furthermore, we conducted simulations with varying initial survival and tag reporting rates to show that M estimation reliability declines as these rates decline. Restricted time-at-large, full initial survival, and complete reporting assumptions produce an M estimate closer to that of the integrated length-based assessment method. Because the reliability of the M estimate is sensitive to changes in these assumptions, future efforts should focus on maximizing the number of tagged crab (and hence recaptures), evaluating initial tag-induced mortality, and optimizing tagged crab recapture reporting rates. The reliance of fishery-dependent data and high tag reporting rates highlights the importance for maintaining a positive cooperation with fishers for efforts towards sustainable management.

我们通过比较基于长度的综合评估模型方法和使用标签释放-重新捕获数据的可能性方法，评估了东部阿留申群岛雄性金帝王蟹 ( Lithodes aequispinus ) 的自然死亡率 ( M yr ^{-1 ) 估计可靠性，这是一种已开发的种群。}我们使用 1997 年、2003 年和 2006 年的标签释放-重新捕获数据来估计尺寸转换矩阵M、捕捞死亡率、总选择性和保留选择性，并比较两种方法之间的M似然分布。此外，我们进行了具有不同初始存活率和标签报告率的模拟，以表明M估计可靠性随着这些比率的下降而下降。受限的长期生存时间、完整的初始生存期和完整的报告假设产生的M估计值更接近于基于长度的综合评估方法的估计值。因为M估计的可靠性对这些假设的变化很敏感，所以未来的努力应该集中在最大化标记螃蟹（以及因此重新捕获）的数量，评估初始标记引起的死亡率，并优化标记螃蟹重新捕获报告率。依赖渔业的数据和高标签报告率凸显了与渔民保持积极合作以努力实现可持续管理的重要性。