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I'm new to it, a rank amateur. I'm a surf caster/ r&r guy who has taken up free diving. It burns more calories than a good session in the bedroom. Anyway.
A guy told me to listen. You'll hear fish before you see them.
With blackfish you hear them chew. I think they're using those teeth in the backs of their throats to grind up crabs and mussels. When you're in a spot that has a lot of feeding blackfish the sound is like hundreds of stones rolling over and grinding against each other.
But the bass noise--the big bass noise--is new to me. But now I know. A guy told me it's the pressure wave of water being displaced from their broad-sweeping tails.
Very cool.
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