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Demersal fish assemblages from the continental shelf margin to the upper continental slope, southwest of Nagasaki, Japan

机译:从日本长崎西南部的大陆架边缘到上部大陆坡的底层鱼类组合

摘要

In the period from May 2006 to December 2008, a series of beam trawl surveys was carried out during the daytime to obtain the quantitative and qualitative information of demersal fishes from the continental shelf margin to the upper continental slope, southwest of Nagasaki Prefecture between depths of 155m and 608m. A total of 2713 individuals of 4 subspecies and 127 species belonging to 60 families were collected from 60 hauls performed. The dominant fish species in terms of abundance were squalid sharks (Etmopterus brachyurus), congrid fishes (Acromycter nezumi, Congriscus megastomus), neoscopelid fishes (Neoscopelus macrolepidotus, Neoscopelus microchir)and macrourid fishes (Caelorinchus anatirostris, Coryphaenoides marginatus, Ventrifossa farmani). Four bathymetric faunal zones of demersal fishes collected with a beam trawl could be recognized based on both group-averaged clustering and non-metric multidimensional scaling, i.e. 1) the continental shelf margin zone (shallower than ca. 200 m), 2) the upper slope zone of the upper continental slope (ca. 300 m), 3) the middle slope zone of the upper continental slope (ca. 400 m-500 m), 4) the lower slope zone of the upper continental slope (deeper than ca. 600 m).
机译:在2006年5月至2008年12月期间,白天进行了一系列拖网调查,以获取从长崎县西南部长崎县西南部大陆架边缘到上大陆斜坡上的深海鱼类的定量和定性信息。 155m和608m。从进行的60处捕捞活动中,总共收集了60个科的4个亚种和127个物种的2713个个体。就丰度而言,主要鱼类种类为鲨鱼(Etmopterus brachyurus),gri类鱼类(Acromycter nezumi,Congriscus megastomus),内窥镜科鱼类(Neoscopelus macrolepidotus,Neoscopelus microchir)和大型鱼类(Caelorinchus anatirostriides)。基于群体平均聚类和非度量多维标度,可以识别出使用拖网拖网收集的四个深海鱼类的动物区系带,即:1)大陆架边缘带(小于约200 m); 2)上部上大陆斜坡的斜坡带(约300 m),3)上大陆斜坡的中带斜坡(约400 m-500 m),4)上大陆斜坡的下斜坡带(深于ca 600 m)。

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