Mesozooplankton average mass during Professor Vodyanitskiy cruise PV18, Part II

Mesozooplankton was sampled by open-closing JUDAY net with a 36 cm ring diameter and mesh size of 125 µm. The open-closing mechanism used was the Nansen mechanical lock system allowing nets to be vertically towed through depths with the temperature gradient maximum (from 10-40 down to 50-100 m) and closed at the upper depth level. Integrated hauls (0-100 m) were also taken. Depth of tow was evaluated by wire paid out and the angle of wire inclination. The 10-20 ml samples were preserved in 3-4% buffered formaldehyde and processed on return to the laboratory. All of copepods were identified to genus level, other taxanomic groups - to type, class, order and family levels.

中型浮游动物的采样采用环径36 cm、网目尺寸125 µm的开合式JUDAY网完成。该网具搭载南森（Nansen）机械锁合机构，可使网体在温度梯度峰值水层（10~40 m至50~100 m）中垂直拖曳，并在上层水层完成闭合。研究同时开展了0~100 m水层的全程拖网采样。拖网深度通过放出的钢缆长度及钢缆倾角进行测算。采集得到的10~20 mL样品采用3%~4%的缓冲甲醛溶液固定，并在返回实验室后开展后续处理。所有桡足类均被鉴定至属级分类阶元，其余分类类群则分别鉴定至型、纲、目及科级分类阶元。