This is the second part of this video, minutes 2:00 thru 6:00 of 15:00.

This has some great shots of the male Humpback slapping the water with his tail and fins, pushing the herring school closer together. In one part, you can see the tail is about half the size of an 18ft skiff which is crossing the harbor.

first part at -

http://www.liveleak.com/view?i=cd2_1250578222