Grabbing sushi with david Tze is frustrating. Tze, 34, is the managing director of Aquacopia, an investment firm providing venture capital to fish farms. His iPhone runs an application that lists species to avoid for health or environmental reasons. Ask him to check on a favorite like yellowtail, eel or tuna, and the answer is the same: Skip it.rnThe oceans can't keep up with demand for fish, which has been climbing 3.6% a year (twice the growth in population) since the 1960s. The stocks of some species, like Atlantic cod, collapsed long ago; Atlantic blue fin tuna are nearly gone; Chilean sea bass and flounder are under pressure.
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