Example of saildrone echosounder record. Juvenile pollock are near the surface, while adults are near the seafloor

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Example of saildrone echosounder record. Juvenile pollock are near the surface, while adults are near the seafloor

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Example of saildrone echosounder record. Juvenile pollock are near the surface, while adults are near the seafloor photo copyright NOAA Fisheries taken at

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