Re: blackfish feeding in a tank
I've observed many "bottom" fish bash prey to pieces against the bottom sediment to make smaller pieces. Blackfish, SeaBass, Scup, Ling, Stripers, Searobins....
What this video does/doesn't show is competition among fish and "natural" behavior. The fish in the tank can take it's time and doesn't have to contend with another fish taking away the rest of the crab.
The guy with the camera should have been behind some sort of "blind" so that every time he moved-he didn't spook the fish.
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