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首页> 外文期刊>ICES Journal of Marine Science >Measuring herring densities with one real and several phantom research vessels
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Measuring herring densities with one real and several phantom research vessels

机译：用一艘真实的和几艘幻影研究船测量鲱鱼密度

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Vessel-induced avoidance can potentially cause a large bias in acoustic estimates of schooling, pelagic-fish biomass. This paper presents a method for quantifying this uncertainty. Volume-backscattering strength (S_v) from a horizontally projecting, multibeam sonar (Simrad MS70) is resampled to form synthetic, vertical, echosounder beams to the side of the survey vessel. These data are analysed as if they were collected from phantom vessels surveying parallel transects at fixed ranges from the real vessel. The nautical-area-backscattering coefficients (s_A) from the synthetic echograms are compared with those measured by conventional 70 and 120 kHz echosounders (Simrad EK60) on the real vessel. Data collected in 2006 from schools of Norwegian spring-spawning herring are used to illustrate the method and explore its limitations. Potential effects of vessel-induced avoidance are evaluated by comparing the mean s_A values observed from the phantom vessels with those observed from the real vessel. The technique also allows direct estimates of the mean lateral-aspect target strength of in situ herring.
机译：容器引起的回避可能对养殖中，上层鱼类生物量的声学估计造成很大的偏差。本文提出了一种量化这种不确定性的方法。对水平投射的多束声纳（Simrad MS70）的体积后向散射强度（S_v）进行重新采样，以形成合成的，垂直的，回声测深波束到测量船的侧面。对这些数据进行分析，就好像它们是从幻影容器中收集的一样，它们是在真实容器的固定范围内测量平行样线的。将合成回波图的航海区域后向散射系数（s_A）与实际船只上常规70和120 kHz回波探测器（Simrad EK60）测得的值进行比较。 2006年从挪威春季产卵鲱鱼学校收集的数据用于说明该方法并探讨其局限性。通过比较从幻影血管观察到的平均s_A值与从真实血管观察到的平均s_A值，可以评估血管诱发回避的潜在影响。该技术还可以直接估算原位鲱鱼的平均侧面目标强度。

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