DEVELOPMENT AND USE OF SONAR MAPPING FOR PELAGIC STOCK ASSESSMENT IN THE CALIFORNIA CURRENT AREA l
DEVELOPMENT AND USE OF SONAR MAPPING FOR PELAGIC STOCK ASSESSMENT IN THE CALIFORNIA CURRENT AREA l
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声纳测绘技术的开发和应用，用于加州海流区域的中上层种群评估 l
DOI：
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发表时间：
1976
期刊：
影响因子：
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通讯作者：
John C. Brown
中科院分区：
文献类型：
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作者：
R. Hewitt;P. Smith;John C. Brown
本文介绍了一种利用固定声纳波束测绘鱼群的中上层鱼类资源测量方法。鱼群的两个主要声学特性的样本，即，声学导出的水平维度（代表学校体积）和目标强度（其可以代表学校紧凑度）。本文讨论了这些性质测量中的抽样偏差和抽样变异性的来源.本文介绍了两个实验的结果，这两个实验是为了确定鱼群的重量作为其声学特性的函数而进行的。在第一个实验中，一个声学透明的陷阱被用来重现鱼的聚集，在第二个实验中，商业渔船被租用来捕获整个鱼群。本文介绍了一种自动声纳数据采集和处理系统，并给出了试验结果.配对自动化调查的结果洛杉矶（南加州）湾介绍和讨论。本文报道了由P.E.史密斯，1970年。与海军和加州渔猎部合作进行的实地调查表明，在洛杉矶湾，鱼群直径中值为30米，平均鱼群密度为每平方米水平鱼群面积15公斤鱼生物量，估计中上层鱼群目标的生物量为1.23至2.30 x lOS公吨。
A method for pelagic fish stock aBBessment is presented which utilizes a fixed sonar beam for mapping fish schools. Samples of the two major acoustic properties of fish schools are presented, i.e., acousti cally derived horizontal dimensions (representative of school volume) and target strengths (which may be representative of school compaction). Sampling biases and sources ofsampling variability in the measurement of these properties are discussed. The results of two experiments, conducted to determine the weight ofa fish school as a function ofits acoustic characteristics, are presented. In the first experiment, an acoustically transparent trap was used to recreate an aggregation of fish and in the second, commercial fishing boats were chartered to capture whole schools. An automated sonar data acquisition and proceBBing system is described and test results presented. The results of paired automated surveys of the Los Angeles (southern California) Bight are presented and discussed. The paper reports development of the sonar-fish school mapping method first documented by P. E. Smith in 1970. Field investigations, conducted in cooperation with the Navy and the California Department of Fish and Game, indicate a median school size of 30 m diameter, a mean fish density of 15 kg of fish biomass per square meter of horizontal school area, and a biomass estimate of 1.23 to 2.30 x lOS metric tons for pelagic schooled targets in the Los Angeles Bight.