Estimates of the survival of juvenile sharks within their critical habitats are important in defining the dynamic of the species and designing management strategies. The objective of this study was to evaluate the survival of juvenile lemon sharks, Negaprion brevirostris, at Los Roques Archipelago. During the period 2005–2014, 29 field surveys were conducted in the Sebastopol Lagoon, an area previously identified as a nursery area for this species, capturing 223 juveniles. Survival was evaluated by use of two modeling approaches (POPAN and Multistate) based on tag-recapture data. The annual probabilities of survival obtained were low (0.40–0.52), but were comparable with those estimates reported for other populations of juvenile lemon sharks. The probabilities of survival did not vary with age group. The low levels of survival and the absence of increased estimates with age suggest the influence of illegal fishing within Sebastopol Lagoon, which may be more selectively catching the larger juveniles. More effective control and surveillance is needed in the Los Roques Archipelago by the local institutions with responsibility for the conservation of marine resources.

中文翻译：

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基于标签捕获数据的南洛斯罗克斯群岛少年柠檬鲨的存活估计

对鲨鱼在其关键栖息地内的生存情况进行评估对于确定物种的动态和设计管理策略非常重要。这项研究的目的是评估洛斯罗克斯群岛的幼龄柠檬鲨（Negaprion brevirostris）的生存情况。在2005-2014年期间，在塞巴斯托波尔泻湖进行了29次现场调查，塞巴斯托波尔泻湖以前被确定为该物种的苗圃区，捕获了223名少年。通过基于标签捕获数据的两种建模方法（POPAN和多状态）评估生存率。所获得的年生存概率很低（0.40–0.52），但与其他柠檬幼鲨种群的估计值可比。存活的概率不随年龄组而变化。生存水平低和缺乏随年龄增加的估计数表明塞巴斯托波尔泻湖内的非法捕鱼的影响，这可能更有选择性地捕捞较大的幼鱼。负责保护海洋资源的地方机构需要在洛斯罗克斯群岛进行更有效的控制和监视。