Aquafin CRC Salmon Project - Huon Grazing Experiment Series - Sept 2003 to July 2004

The Aquafin CRC Salmon Project is being undertaken by CSIRO Marine and Atmospheric Research (CMAR) and Tasmanian Aquaculture and Fisheries Institute (TAFI). The huon microheterotroph grazing experiments were undertaken on 23 September 2003 (HG01), 18 November 2003 (HG02), 24 February 2004 (HG03) and 26 July 2004 (HG04). Sampling took place in Hideaway Bay in the Huon Estuary. Prior to each microheterotroph grazing experiment, a CTD cast was performed at site P3 using the SBE19-0605 to determine the fluorescence profile. Water for the grazing experiments was collected from 5-7m, i.e. at about 50% of surface light level and below any surface freshwater runoff layer. Samples were incubated for 24 hours with subsamples collected at times T0 and T24 for phytoplankton and microheterotroph counts, nutrient analysis and pigment concentration and composition. Grazing and growth rates were calculated.

Aquafin CRC三文鱼项目（Aquafin CRC Salmon Project）由澳大利亚联邦科学与工业研究组织海洋与大气研究部（CSIRO Marine and Atmospheric Research, CMAR）与塔斯马尼亚水产与渔业研究所（Tasmanian Aquaculture and Fisheries Institute, TAFI）联合实施。胡恩河微型异养生物（microheterotroph）摄食实验分别于2003年9月23日（HG01）、2003年11月18日（HG02）、2004年2月24日（HG03）及2004年7月26日（HG04）完成。采样作业开展于胡恩河口的隐湾（Hideaway Bay）。在每次微型异养生物摄食实验开展前，研究人员均会在P3站位使用型号为SBE19-0605的CTD（温盐深剖面仪）开展剖面测量，以获取荧光剖面数据。用于摄食实验的水体采集自5至7米水层，该水层约处于表层光照强度的50%处，且位于所有表层淡水径流层下方。实验样本经24小时培养，分别在T0与T24时刻采集子样本，用于浮游植物（phytoplankton）与微型异养生物计数、营养盐分析以及色素浓度与组成测定。研究人员最终计算得到了摄食速率与生长速率。