Biomass density and catch composition of mesopelagic fish and invertebrates in the Northeast Atlantic@en

During three cruises in the Mid Atlantic Ridge area in 2016 and 2017, we studied the biomass of mesopelagic fish down to a depth of 600 m and identified and quantified the species composition of the catches. The biomass density was estimated considering the volume of water filtered by the cross-sectional area of the trawl blinded with 16 mm meshes (130 m–2), the distanced covered by the trawl (m) at a towing speed (transformed to m s–1) the effective tow time (min) and the catch (kg).2016至2017年，研究团队在大西洋中脊（Mid-Atlantic Ridge）海域开展3次科考航次，针对水深600米以深的中层鱼类（mesopelagic fish）生物量展开研究，并对渔获物的物种组成进行鉴定与定量分析。本次研究的生物量密度估算需综合以下参数：网目尺寸为16毫米的拖网过滤横截面积（130 m⁻²）、拖网行进距离（单位：米，拖曳速度转换为米每秒）、有效拖曳时长（单位：分钟）以及渔获重量（单位：千克）。