Prawns (Chorismus antarcticus) caught by mesh traps at the Vestfold Hills

This record describes the collection of marine fauna sampled from coastal areas of the Vestfold Hills in 1999. The project was undertaken to compile morphometric data on Weddell seal prey species. Benthic prawns i.e. Chorismus antarcticus and Notocrangon antarcticus, are common Weddell prey species at the Vestfold Hills. We fished for prawns using mesh traps (40 x 20 x 20 cm3). The traps were set at Magnetic Island in May, and in Ellis Fjord in December. The site near Magnetic Island was chosen when the fast-ice fractured enabling the gear to be set in natural tracts of open water. The site in Ellis Fjord was chosen on the basis of published information regarding bathymetry and the range of depths inhabited by prawn species. We waited until December to sample in Ellis Fjord so that the fishing hole did not refreeze. Prawns were caught only in Ellis Fjord and only when the traps were deployed open i.e. with zips on the doors to get the catch out left undone. Approximately 50 prawns of various sizes were caught over three days at the same location, 200 m east of the crossing at Ellis Narrows. The catch has been stored whole in the Australian Antarctic Division freezer in Hobart. Bycatch included amphipods and Notothenid fish at Magnetic Island, and echinoderms, holothurians and Notothenid fish in Ellis Fjord. Some of the bycatch were retained and are stored frozen with the prawns. The linked dataset contains the measurements of length, mass, carapace length and sex (juvenile, male, female) of the prawn catch. All of the prawns were Chorismus antarcticus. The adult females were brooding eggs. The best fit linear regressions were y = 0.3529x - 2.4824, (R2 = 0.9504) for carapace length to predict body mass, and y = 3.5267x + 4.5846 (R2 = 0.9544) for carapace length to body length. The associated URLs contain all of the data, including spreadsheet of data, a scatterplot of the length mass relationship, and a mass frequency histogram of the catch. The fields in this dataset are: Chorismus ID carapace length (mm) body length (mm) mass (g) sex本记录详述了1999年于维斯特福尔德丘陵（Vestfold Hills）沿岸海域采集海洋动物群的相关工作。本项目旨在整理威德尔海豹（Weddell seal）猎物物种的形态测量数据。底栖对虾（benthic prawns）即南极长臂虾（Chorismus antarcticus）与南极新虾（Notocrangon antarcticus），是维斯特福尔德丘陵海域常见的威德尔海豹猎物。 研究人员使用规格为40×20×20 cm³的网笼捕捞对虾。网笼分别于5月在磁岛（Magnetic Island）、12月在埃利斯峡湾（Ellis Fjord）布设。磁岛采样点的选择依据为当年固定冰破裂后可在自然开阔水域布设设备的条件；埃利斯峡湾采样点则基于已发表的水深地形数据及对虾栖息深度范围确定。研究人员推迟至12月在埃利斯峡湾开展采样，以确保冰上捕捞孔不会重新封冻。 仅在埃利斯峡湾捕获到对虾，且仅当诱捕笼保持开启状态（即用于取出渔获的笼门拉链未扣合）时，才可成功捕获。在埃利斯峡道（Ellis Narrows）以东200米的同一采样点，研究人员在3天内共捕获约50只不同规格的对虾。所有捕获样本均以整虾形式保存于霍巴特市澳大利亚南极局（Australian Antarctic Division）的冷冻库中。磁岛采样点的兼捕生物包括端足类（amphipods）与南极鱼（Notothenid fish）；埃利斯峡湾采样点的兼捕生物则包括棘皮动物（echinoderms）、海参（holothurians）及南极鱼。部分兼捕生物与对虾一同被冷冻保存。 本关联数据集包含本次捕获对虾的体长、体质量、头胸甲长度及性别（幼体、雄性、雌性）测量数据。所有捕获对虾均为南极长臂虾（Chorismus antarcticus），其中成年雌性个体携带抱卵。针对头胸甲长度与体质量的关系，最优线性回归方程为y = 0.3529x - 2.4824（决定系数R²=0.9504）；针对头胸甲长度与体长的关系，最优线性回归方程为y = 3.5267x + 4.5846（决定系数R²=0.9544）。相关链接包含全部数据，包括数据电子表格、体长-体质量关系散点图及捕获样本体质量频率直方图。 本数据集包含以下字段： Chorismus ID（南极长臂虾编号） 头胸甲长度（mm） 体长（mm） 体质量（g） 性别