RMT and bottom trawl logs from the AAMBER 2 voyage of the Aurora Australis, 1991

This dataset contains scanned copies of the RMT and bottom trawl logs from Voyage 6 1990-91 (AAMBER2) of the Aurora Australis. This was primarily a marine science voyage. Surveys of krill, other zooplankton and pelagic fish were taken in Prydz Bay, Antarctica between January and February 1991.177 midwater trawls were successfully completed at 59 stations.Midwater fish were sampled using an International Young Gadoid Pelagic Trawl (IYGPT). At each station, hauls were taken at depths of 20-30m, approximately halfway down the water column, and 20-30m above the bottom. At six stations, the lowest sample was duplicated using a light fitted to the net. Where samples were made off the shelf, standard depths of 20-30m, 400m, and 800m were fished.All hauls were of 30 minutes fishing time. Bottom trawls were made using a 35m headline length otter trawl fitted with 40cm diameter bobbin gear. A 2" mesh cod end liner was used to retain small fish. On both nets, a Simrad trawl surveillance sonar was used.

本数据集包含"南极光号"（Aurora Australis）1990-1991年第6航次（AAMBER2）的矩形中层拖网（Rectangular Midwater Trawl，RMT）与底拖网作业日志扫描副本。本次航次以海洋科学考察为核心任务，于1991年1-2月在南极普里兹湾开展了磷虾、其他浮游动物及中层鱼类调查。本次调查共于59个站位顺利完成177次中层拖网作业，中层鱼类样本采集采用国际稚鳕科中层拖网（International Young Gadoid Pelagic Trawl，IYGPT）完成。每个站位的拖网作业分别设置三个采样层位：20-30米水层（约为水体中层位置）、离底20-30米水层。其中6个站位的底层采样采用加装灯光的拖网进行了重复采样。若采用标准化采样方案，则按照20-30米、400米及800米的标准水层开展拖网作业。所有拖网作业的捕捞时长均为30分钟。底拖网作业采用上纲长度35米的网板拖网，配备直径40厘米的滚轮装置，并使用网目尺寸为2英寸的网囊衬网留存小型鱼类样本。两套拖网系统均搭载Simrad拖网监测声呐进行作业监控。