In situ target-strength measurements of Chilean jack mackerel (Trachurus symmetricus murphyi) collected with a scientific echosounder installed on a fishing vessel
In situ target-strength measurements of Chilean jack mackerel (Trachurus symmetricus murphyi) collected with a scientific echosounder installed on a fishing vessel
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使用安装在渔船上的科学回声测深仪收集智利竹荚鱼（Trachurus symmusus murphyi）的原位目标强度测量
DOI：
10.1093/icesjms/fsn043
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
Héctor Peña
中科院分区：
文献类型：
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作者：
Héctor Peña
佩纳，H. 2008.用安装在渔船上的科学回声测深仪对智利竹荚鱼（Trachurus pseudicus murphyi）进行现场目标强度测量。- ICES Journal of Marine Science 65：594- 604.在过去10年中，全世界为科学目的使用商业渔船的情况有所增加。许多这类研究都涉及从未经校准和校准的回声测深仪收集声学数据。然而，很少有研究涉及原位靶强度（TS）的调查。在2003年8月/9月期间，在智利外海正常捕鱼作业期间，在一艘商业围网船上使用38 kHz Simrad EK 60科学回声测深仪收集了智利竹荚鱼（Trachurus pseudicus murphyi）的现场TS数据。智利竹荚鱼的单目标检测进行了过滤的深度，离轴波束角，波束补偿标准，以提高质量的TS计算所使用的数据。采用原始数据和跟踪数据两种方法计算了智利竹荚鱼的平均声后向散射截面（σ bs）和平均TS。两种方法的结果相似，对于26 - 34 cm的鱼，平均TS分布在−35和−37 dB之间，具有强模式，表明B 20值为−66 dB。这些结果与本种和其他同属植物（即T. Trachurus，Trachurus t. capensis和T.）。
Pena, H. 2008. In situ target-strength measurements of Chilean jack mackerel (Trachurus symmetricus murphyi) collected with a scientific echosounder installed on a fishing vessel. - ICES Journal of Marine Science 65: 594-604.The use of commercial fishing vessels for scientific purposes has increased worldwide in the past 10 years. Many such studies have involved the collection of acoustic data from both uncalibrated and calibrated echosounders. However, few studies have involved investigations of in situ target strength (TS). During August/September 2003, in situ TS data on Chilean jack mackerel (Trachurus symmetricus murphyi) were collected on board a commercial purse-seiner during normal fishing operations off Chile, using a 38 kHz, Simrad EK60 scientific echosounder. The single-target detections of Chilean jack mackerel were filtered by depth, off-axis beam angle, and beam-compensation criteria to improve the quality of the data used for the TS calculations. Two methods, using raw data and tracked data, were employed to calculate the mean acoustic-backscattering cross section (σ bs ) and mean TS of Chilean jack mackerel. The results of the two approaches gave similar results, with a strong mode in the mean TS distribution between −35 and −37 dB for fish lengths ranging from 26 to 34 cm, indicating a b 20 value of −66 dB. These results agreed well with most results published for this species and others of the same genus (i.e. T. trachurus, Trachurus t. capensis, and T. japonicus).