Having been on a research trip with marine biologists, eating Sushi, and ocean fish in general is pure evil. Common fishing practices such as long lining are destroying the ecosystem at a drastic/alarming pace.
There are a number of articles on this topic - this whole transcript was interesting:
http://www.abc.net.au/rn/scienceshow...06/1766715.htm
Quote:
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The figure that emerges is that we have about 10% of the biomass of large fish left...or less in most cases. And that means where we had ten tonnes per square kilometre of large fish we have now one tonne or less, and for some of these large predators such as sharks, it is one in a hundred that is left, not one in ten.
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Think of that the next time you're tucking into your tuna. Shrimp is even worse as 90% of the catch is "bi-catch" which just gets tossed back into the ocean dead or dying.