海洋音響学会誌
Online ISSN : 1881-6819
Print ISSN : 0916-5835
ISSN-L : 0916-5835
42 巻 , 4 号
選択された号の論文の1件中1~1を表示しています
論文
  • Wan-Yu KAO, Makoto TOMIYASU, Ryuzo TAKAHASHI, Michio OGAWA, Tarou HIRO ...
    2015 年 42 巻 4 号 p. 167-176
    発行日: 2015年
    公開日: 2016/09/13
    ジャーナル フリー
    To ensure sustainable utilization of the hairtail (Trichiurus japonicus) fishery resources in the coastal and offshore waters of Japan, 15 acoustic surveys were conducted from 2007 to 2013 using a 38 kHz split-beam echo sounder. The hairtail was mainly distributed depth between 80 and 280 m in winter (particularly between 80–120 m), 60–280 m in depth (particularly between 120–160 m) in autumn, and 70–260 m in depth (particularly between 70–140 m) in summer. The average area backscattering coefficient (sa) was higher in winter and spring between 2008 and 2009; in the other years it was highest in autumn. The average sa was significantly influenced by depth, temperature, salinity, and turbidity in univariate analyses (p<0.05). However, in linear regression analyses, the average sa significantly increased only with increases in temperature and salinity, whereas the effects of depth and turbidity were not statistically significant.
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