RV Investigator Voyage IN2017_V04 Cephalopod specimens, Tasman Sea, Australia

Cephalopods were sampled from a cyclonic cold-core eddy in the western Tasman Sea, using midwater trawls from 10th to 12th September 2017 during a research voyage on Australia's Marine National Facility RV Investigator. Two different types of trawl equipment were used. The first trawl type sampled the upper 100 m of the eddy using a Danish pelagic trawl with 300 μm mesh, towed at approximately 1 m/s (2 knots) for 60 min per trawl (n= 9). The second trawl type was an International Young Gadoid Pelagic Trawl (IYGPT) fitted with a MIDwater Open and Closing net system with six distinct codends to enable depth stratified sampling. The IYGPT trawl has a mesh size of 200 mm reducing to 10 mm, and the codend mesh size was 500 μm. The IYGPT trawl was lowered to 500 m, with the first codend sampling obliquely from the surface to 500 m, and each subsequent codend sampled 100 m depth intervals for approximately 20 min each at 1 m/s, as the trawl returned to the surface. Data supporting this study are available from a GitHub repository archived using Zenodo https://doi.org/10.5281/zenodo.3980411 - see citation (Murphy et al., 2020). Deployment locations are from event logs stored in the ships data archive

2017年9月10日至12日，依托澳大利亚海洋国家设施"调查者号"（RV Investigator）科考航次，研究人员在塔斯曼海西部的一处气旋式冷涡中，使用中层拖网采集了头足类（Cephalopods）样本。本次作业采用两类拖网设备：第一类为丹麦式中层拖网（Danish pelagic trawl），网目尺寸为300 μm，拖速约1 m/s（2节），单次拖网时长60分钟，共完成9次有效拖网采样（n=9），采样覆盖该冷涡上层100米水深区域。第二类为国际幼鳕中层拖网（International Young Gadoid Pelagic Trawl, IYGPT），该拖网搭载中层开闭式网系统（MIDwater Open and Closing net system），配备6个独立囊网以实现分层深度采样。该拖网主网的网目尺寸为200 mm至10 mm渐变，囊网网目尺寸为500 μm。作业时，IYGPT拖网被下放至500米水深，首个囊网以斜向采样模式从海面至500米水深开展采样；后续每个囊网以1 m/s的拖速，在100米水深间隔内采样约20分钟，直至拖网返回海面。本研究的支撑数据可通过Zenodo归档的GitHub仓库获取，存档链接为https://doi.org/10.5281/zenodo.3980411，具体引用格式详见Murphy等人（2020）的研究文献。拖网的部署位置源自船舶数据档案中存储的航次事件日志。