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首页> 外文期刊>Marine and Coastal Fisheries >Feasibility of a Regionwide Probability Survey for Coral Reef Fish in Puerto Rico and the U.S. Virgin Islands
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Feasibility of a Regionwide Probability Survey for Coral Reef Fish in Puerto Rico and the U.S. Virgin Islands

机译：在波多黎各和美属维尔京群岛进行珊瑚礁鱼区域性概率调查的可行性

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Fishery-independent surveys can provide accurate and precise data for stock assessments and spatial management to sustain fishery resources as a complementary or alternative source of information to fishery-dependent sampling. Four years of underwater visual survey data collected in several local areas in the U.S. Caribbean were used in conjunction with detailed bathymetric and habitat maps to develop a probability sampling design and investigate the feasibility of conducting a regionwide coral reef fish survey. Stratification by depth and habitat produced a more efficient survey design (i.e., one with increased precision at lower sample sizes) for estimating mean fish density than simple random sampling for eight principal exploited and nontarget species. Species with higher sample variance of density required larger sample sizes to improve survey precision. A somewhat counterintuitive finding was that controlling survey precision over a large spatial scale (i.e., region) required less sampling than controlling precision for multiple smaller areas within the larger survey frame. At regionwide spatial scales relevant for fisheries management, the projected sample sizes for achieving moderately high levels of survey precision were comparable to historical annual sampling efforts. However, controlling survey precision both inside and outside spatial management zones would likely require sample sizes about twice the level of the historical effort. Our findings stress the importance of clearly defining management objectives with respect to spatial scales and target species as a prerequisite for developing precise, cost-effective fishery-independent surveys.
机译：独立于渔业的调查可以为种群评估和空间管理提供准确和精确的数据，以维持渔业资源，作为依赖渔业的抽样的补充或替代信息来源。在美国加勒比海多个地区收集的四年水下视觉调查数据与详细的测深图和栖息地地图结合使用，以开发概率抽样设计并调查进行区域性珊瑚礁鱼调查的可行性。通过深度和栖息地分层产生了比八种主要开发和非目标物种的简单随机抽样更有效的调查设计（即，在较小的样本量下精度更高）。具有较高样本方差的物种需要更大的样本量才能提高调查精度。有点违反直觉的发现是，与在较大的调查框架内对多个较小区域进行控制的精度相比，在较大的空间范围（即区域）上控制调查的精度需要更少的采样。在与渔业管理有关的区域范围的空间尺度上，为实现中等高水平的调查精度而预计的样本量与历史年度抽样工作相当。但是，要控制空间管理区域内外的调查精度，可能需要的样本量约为历史水平的两倍。我们的研究结果强调了明确定义有关空间规模和目标物种的管理目标的重要性，这是开展精确，经济高效的独立于渔业的调查的前提。

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