Abstract
Contemporary data for humpback whale prey in British Columbia, Canada, are biased toward prey types that require surface feeding, with no information on the whales’ feeding behaviour at depth on alternative prey sources. Here, we present evidence that a humpback whale in Juan de Fuca Strait was subsurface feeding on juvenile pollock. We combined data from a multisensor, animal-borne tag with a vessel-mounted, Acoustic Zooplankton and Fish Profiler to describe the foraging effort of the whale relative to its prey. Analysis of a fecal sample from the tagged whale also revealed juvenile pollock. This work suggests a comprehensive sampling framework for the deeper foraging humpback whales in B.C. that are difficult to access for setting up quantitative data collection programs.
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