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Acoustic identification of isada krill, Euphausia pacifica Hansen, off the Sanriku coast, north‐eastern Japan
Author(s) -
MIYASHITA KAZUSHI,
AOKI ICHIRO,
SENO KOUTARO,
TAKI KENJI,
OGISHIMA TAKASHI
Publication year - 1998
Publication title -
fisheries oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 80
eISSN - 1365-2419
pISSN - 1054-6006
DOI - 10.1046/j.1365-2419.1998.00042.x
Subject(s) - krill , euphausia , pollock , trawling , oceanography , fishery , geology , biology , fishing
In this study, the feasibility of identification and abundance estimation of isada krill, Euphausia pacifica , was examined using a two‐frequency (38 and 120 kHz) method. The acoustic survey and midwater trawling were conducted off the Sanriku coast, northern part of Honshu, Japan. In one pattern, the SV difference between the two frequencies was large, and in the other, the SV difference was small. These results were interpreted by scattering models, and showed that discrimination between isada krill and walleye pollock was possible.