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pro vyhledávání: '"Vebjørn Melle"'
Publikováno v:
ICES Journal of Marine Science. 53:449-452
Fourteen herring schools swimming and actively feeding in 15-40 m depth in the Norwegian Sea were followed for about 1 h each in May 1994 using SIMRAD SA950 sidescan sonar: most of the schools were not recorded by a conventional echo-sounder because