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首页> 外文期刊>Ocean & coastal management >Ignoring the spatial structure of the sea cucumber Isostichopus fuscus distribution when granting quotas can be costly
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Ignoring the spatial structure of the sea cucumber Isostichopus fuscus distribution when granting quotas can be costly

机译：当授予配额时，忽略海参的空间结构Fuscus分配可能是昂贵的

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摘要

There is an increasing demand for fisheries resources worldwide. For example, the Asian markets have traditionally consumed sea cucumber as a delicacy and their buoyant economies have promoted demand for it in recent years. The brown sea cucumber Isostichopus fuscus is the most valuable species from the Eastern Pacific and it has been almost depleted due to overfishing. In this work, we analyzed data of sea cucumber abundance collected monthly (October 2014 December 2016) along the west coast of the Gulf of California (29.95 degrees N similar to 28.05 degrees N) in 1,107 swath (25 x 2 m) quadrats performed at 118 sites with the goal of determining if current fishing quotas are sustainable. We applied a Bayesian hierarchical modelling approach with integrated nested Laplace approximation (INLA) to this data to account for spatial structure in the data when calculating densities. The observed density ranged from a minimum of 0 to a maximum of 0.58 ind/m(2), with an average of 0.03 ind/m(2) in suitable habitat, defined as the habitat less than 30 m deep and with hard substrate. There are large spatial variations in abundance, but the overall mean suitable habitat is 15.7% (min = 7.8%, max = 28.8%) of the total fishing area. Current quotas are usually higher than 5% of the lower bounds of population density estimates. We propose, among other management measures, that quotas should be granted taking into account the spatial structure of sea cucumber densities as well as the proportion of suitable area within each estate. Given the high levels of illegal fishing within the Gulf of California, it is imperative that quotas are based on the lower bounds of spatially explicit density estimates - along with increased surveillance and enforcement if the long-term commercial sustainability of the fishery is to be maintained.
机译：全球渔业资源需求日益增长。例如，亚洲市场传统上消耗海参，作为一种美味，近年来，他们的浮力经济体促进了对其的需求。棕色海洋黄瓜胰岛素磷骨Fuscus是来自东太平洋最有价值的物种，由于过度捕捞，它几乎已经耗尽。在这项工作中，我们分析了每月（2016年10月2016年12月2016年10月）沿着加利福尼亚州海湾的西海岸（类似于28.05度）的海岸（28.05℃）的数据（25×2米）Quadrats 118个站点，目的是确定当前捕捞配额是否可持续。我们将贝叶斯分层建模方法应用于集成嵌套的LAPLACE近似（INLA）到此数据，以在计算密度时考虑数据中的空间结构。观察到的密度范围为0至最大0.58 ind / m（2），平均合适的栖息地具有0.03 ind / m（2），定义为栖息地小于30米和硬质衬底。丰富的空间变化很大，但总体平均栖息地是总捕捞区域的15.7％（min = 7.8％，最大= 28.8％）。目前的配额通常高于人口密度估计下限的5％。在其他管理措施之外，我们提出了这种配额，应考虑到海参密度的空间结构以及每个庄园内的合适区域的比例。鉴于加利福尼亚州海湾内的高水平捕捞量，必须基于空间明确密度估计的下限 - 如果要维持渔业的长期商业可持续性，则增加监测和执法。

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