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首页> 外文期刊>ICES Journal of Marine Science >Multispecies acoustic dead-zone correction and bias ratio estimates between acoustic and bottom-trawl data
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Multispecies acoustic dead-zone correction and bias ratio estimates between acoustic and bottom-trawl data

机译：声学和底拖网数据之间的多物种声学死区校正和偏差比估计

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In this study, we extended the original work of Kotwicki et al. (2013. Combining bottom trawl and acoustic data to model acoustic dead zone correction and bottom trawl efficiency parameters for semipelagic species. Canadian Journal of Fisheries and Aquatic Sciences 70: 208-219) to jointly estimate the acoustic dead-zone correction, the bias ratio, and the gear efficiency for multiple species by using simultaneously collected acoustic and bottom-trawl data. The model was applied to cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) in the Barents Sea and demonstrated a better or similar performance compared with a single species approach. The vertical distribution of cod and haddock was highly variable and was influenced by light level, water temperature, salinity, and depth. Temperature and sunlight were the most influential factors in this study. Increase in temperature resulted in decreasing catch and fish density in the acoustic dead zone (ADZ), while increasing sun altitude (surrogate for light level) increased the catch and fish density in the ADZ. The catch and density of haddock in the ADZ also increased at the lowest sun altitude level (shortly after midnight). Generally, the density of cod and haddock changed more rapidly in the ADZ than in the catch (from bottom to the effective fishing height) indicating the importance of modelling fish density in the ADZ. Finally, the uncorrelated variability in the annual residual variance of cod and haddock further strengthen the conclusion that species vertical distribution changes frequently and that there are probably many other unobserved environmental variables that affect them independently.
机译：在这项研究中，我们扩展了Kotwicki等人的原始工作。 （2013.结合底部拖网和声学数据来建模半浮游鱼类的声学死区校正和底部拖网效率参数。加拿大渔业和水生科学杂志70：208-219）共同估算声学死区校正，偏差比，以及通过同时收集的声学和底拖网数据，获得多种鱼类的齿轮效率。该模型被应用于巴伦支海的鳕鱼（Gadus morhua）和黑线鳕（Melanogrammus aeglefinus），与单一物种方法相比，表现出更好或相似的性能。鳕鱼和黑线鳕的垂直分布变化很大，并受光照水平，水温，盐度和深度的影响。温度和日光是这项研究中影响最大的因素。温度升高导致声学死区（ADZ）的捕获量和鱼密度降低，而增加太阳高度（光照水平的替代品）则增加ADZ的捕获量和鱼密度。在最低的太阳高度水平（午夜后不久），ADZ中黑线鳕的捕获量和密度也增加了。通常，ADZ中鳕鱼和黑线鳕的密度变化要快于捕获量（从底部到有效捕捞高度），这说明了在ADZ中模拟鱼类密度的重要性。最后，鳕鱼和黑线鳕的年残留方差的不相关变化进一步加强了以下结论：物种垂直分布频繁变化，并且可能还有许多其他未观察到的环境变量独立影响它们。

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