X-ray images of Baltic herring. Data analysis

Based on the developed methodology for the: (i) optimal method of catching, (ii) transporting and storing fish, (iii) measuring and (iv) analyzing X-rays images, the existing collection of X-ray images of Baltic herring, caught in October 2002 during the Swedish component of the Baltic International Acoustic Survey (BIAS) in the Baltic proper (ICES Subdivisions 25, 27 and 29), has been expanded to include of X-ray images of herring from the Polish coastal zone (ICES Subdivision 26). Newly received X-ray images were used to measure the geometric dimensions of swimbladders. Detailed data on the shapes and geometric sizes of herring bodies and swimbladders for dorsal exposure were obtained for 74 fish individuals. These data were used as the input data in the modelling of the backscattering characteristic of the herring from the Polish coastal zone in order to define the TS(L) relationship, critical to abundance estimation from fisheries acoustic surveys.基于已开发的下述研究方法：(i) 鱼类最优捕捞方案、(ii) 鱼类运输与储存规程、(iii) 测量方法，以及(iv) X射线图像（X-ray images）分析流程，现有波罗的海鲱X射线图像数据集——其采样来自2002年10月波罗的海国际声学调查（Baltic International Acoustic Survey, BIAS）瑞典子项目在波罗的海本部海域（国际海洋考察理事会（ICES）第25、27、29分区）的作业——现已扩充纳入波兰沿海海域（ICES第26分区）的鲱鱼X射线图像。新增获取的X射线图像被用于测定鱼鳔（swimbladder）的几何尺寸。针对74尾鲱鱼个体，获取了其背位X射线照射下的鱼体与鱼鳔的形态及几何尺寸详细数据。上述数据被用作建模波兰沿海海域鲱鱼反向散射特性的输入数据，以确定TS(L)关系；该关系对于依托渔业声学调查开展渔业资源量估算具有关键意义。