Cephalopod specimens from RV Investigator voyage IN2017_v04, Tasman Sea, Australia (2017)

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 m 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 m. 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.
Voyage details (metadata, projects, other datasets either online or as downloads, publications and reports, events, maps etc) can be accessed at https://www.marine.csiro.au/data/trawler/survey_details.cfm?survey=IN2017_V04
If this data has been used in any products, please acknowledge with the following: We acknowledge the use of the CSIRO Marine National Facility (https://ror.org/01mae9353) in undertaking this research.

2017年9月10日至12日，依托澳大利亚海洋国家设施（Marine National Facility）“调查者号（RV Investigator）”科考航次，使用中层拖网于塔斯曼海西部的气旋式冷涡中采集头足类（Cephalopods）样本。本次采样共使用两类拖网设备：
第一类拖网为丹麦中层拖网（Danish pelagic trawl），网目尺寸为300毫米，以约1 m/s（2节）的航速单次拖曳60分钟，共完成9次采样（n=9），用于采集该冷涡上层100米水域的生物样本。
第二类拖网为国际幼鳕中层拖网（International Young Gadoid Pelagic Trawl, IYGPT），配备中层开闭式网系统，包含6个独立的囊网（codends），可实现分层深度采样。该拖网的网目尺寸从200毫米缩减至10毫米，囊网网目尺寸为500毫米。该IYGPT拖网被下放至500米水深，首个囊网以斜向方式从海面采样至500米水深；后续每个囊网以1 m/s的航速，在100米深度间隔内采样约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，链接为https://doi.org/10.5281/zenodo.3980411，具体引用信息参见Murphy等（2020）的文献。采样部署位置源自船舶数据档案中存储的事件日志。

航次详情（包括元数据、项目信息、在线或可下载的其他数据集、出版物与报告、事件记录、地图等）可通过以下链接访问：https://www.marine.csiro.au/data/trawler/survey_details.cfm?survey=IN2017_V04

若将本数据集用于相关成果产出，请按照以下方式致谢：本研究使用了澳大利亚联邦科学与工业研究组织（CSIRO）海洋国家设施（致谢链接：https://ror.org/01mae9353）。