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首页> 外文期刊>ICES Journal of Marine Science >Silent ships do not always encounter more fish (revisited): comparison of acoustic backscatter from walleye pollock recorded by a noise-reduced and a conventional research vessel in the eastern Bering Sea
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Silent ships do not always encounter more fish (revisited): comparison of acoustic backscatter from walleye pollock recorded by a noise-reduced and a conventional research vessel in the eastern Bering Sea

机译：沉默的船只并不总是会遇到更多的鱼（重游）：在白令海东部，一艘降噪船和一艘常规研究船记录的壁眼鳕鱼的声学反向散射比较

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摘要

Vessel-induced avoidance behaviour is potentially a major source of error in surveys offish populations. Noise-reduced research vessels have been constructed in an effort to minimize fish reactions to auditory stimuli produced by survey vessels. Here, measurements of acoustic backscatter from walleye pollock (Jheragra chalcogramma) made on the eastern Bering Sea Shelf from the conventional NOAA ship "Miller Freeman" (MF) are compared with similar measurements made on the noise-reduced NOAA ship "Oscar Dyson" (OD). As in a previous study, acoustic abundance measurements from these vessels were equivalent during daylight, when large-scale acoustic surveying is conducted. However, significant differences were observed at night on average, 44% more pollock backscatter was observed from OD than MF. Observations with a free-drifting echosounder buoy suggest that the night-time discrepancy is attributable to a stronger behavioural response to the passage of the louder MF, and a resulting decrease in pollock target strength. Pollock did not exhibit a strong reaction to the passage of OD. These observations are consistent with previous comparisons of these vessels, which show that with vessel differences, the noise-reduced OD detects more pollock.
机译：在鱼类种群调查中，容器引起的回避行为可能是错误的主要来源。为了减少鱼类对调查船产生的听觉刺激的反应，已建造了降噪研究船。此处，将常规NOAA船“ Miller Freeman”（MF）在白令海陆架东部的壁眼狭鳕（Jheragra chalcogramma）的声学反向散射测量结果与降噪的NOAA船“ Oscar Dyson”进行的类似测量结果进行了比较（ OD）。与以前的研究一样，当进行大规模声学测量时，这些容器在白天的声丰度测量值是相等的。但是，平均晚上观察到显着差异，从OD观察到的鳕鱼背散射比MF多44％。自由漂流回声浮标的观察结果表明，夜间差异是由于对响亮的MF的通过产生了更强的行为反应，从而导致了鳕鱼靶强度的降低。 Pollock对OD的通过没有表现出强烈的反应。这些观察结果与这些容器以前的比较是一致的，后者表明随着容器的不同，降低噪音的OD可以检测到更多的鳕。

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