Some of the markets where speculation has been more rampant could see drops approaching 50%, says Stack, who lives in one such market--Whitefish, Mont.

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Freshwater fish from cold waters, like lake herring, lake trout, salmon, and whitefish, are also high in omega-3s.

CNN: How to buy the best fish

Brian Schott, 34, a self-employed marketing consultant in Whitefish, Mont.

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