Trawlings during OCHER cruise OCH1, Part I@en

The fish catches were carried out by the industrial midwater non-closed trawl. There was a small-mesh section with minimum mesh size of 12 mm in the trawl bag. Vertical opening of the trawl made from 35 to 46 m. The trawling duration under catches in the sound-scattering layers made 55 min. to 2 hours and 20 min. Speed of trawling made 4.8-5.7 knots. The catches horizons were determined by the state of sound-scattering layers and fish schools. At night they carried out catches in the upper 2-90 m layer. At the day time they trawled at a range of 32-370 m depths. Each catch was weighted. Fish was determined up to the lowest taxonomic ranks - species, in some cases - genus. Total number and mass of each species in a catch, and average dry mass of one specimen of a species were determined. The standard fish body length (SL) was measured in mm (from the tip of snout to the basement of the middle rays of the caudal fin). The samples were fixed in 10% buffered formaldehyde for further processing in the IBSS laboratories.本数据集的渔获样品采用工业中层非闭合拖网采集。拖网网袋区域设有最小网目尺寸为12 mm的小网目段，拖网垂直张开高度介于35~46 m之间。在声散射层内开展拖网作业的时长为55分钟至2小时20分钟，拖网作业航速为4.8~5.7节。渔获作业水层根据声散射层及鱼群的分布状态确定：夜间作业于表层2~90 m水层，日间作业于32~370 m水深区间。 每批次渔获均进行称重。鱼类鉴定至最低分类阶元——物种，部分类群鉴定至属。记录每批次渔获中各物种的总个体数与总质量，并测定某一物种单尾个体的平均干重。 以毫米（mm）为单位测量鱼类标准体长（SL，即吻端至尾鳍中间鳍条基部的长度）。样品经10%缓冲甲醛溶液固定后，送至IBSS实验室进行后续处理。