Sonar observations of killer whales (Orcinus orca) feeding on herring schools
作者： Tiu Similä
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摘要: Behavior of killer whales feeding on herring schools was recorded with a high frequency (455 kHz) sonar and SVHS tape. Synchronization surfacing behavior analyzed from 8 mm videotapes between 1990–92. Two different techniques, carousel feeding, where cooperatively herd into tight ball towards the surface feed which have been stunned by tailslaps, subsurface were observed compared. Subsurface showed less coordination spent time around than whales. Both techniques employed mainly in upper 20 m water but only brought school to surface. approaching down 98 m, no could be verified when deeper m. The possible causes for are discussed as well apparent similarity predator–antipredator schooling fish their predators regardless species question.
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