foodguy
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This.
The difference between extremely fresh fish and even day-old fish is remarkable. My guess is that the "fishy" smell comes from the oxidation/breakdown of the ***** acids in the fish when exposed to air. Those ***** acids (omega-3s) are essential to healthy brain function, so eat up.
well, a couple of things. first: like any other animal, fish need to go through rigor mortis to taste their best. the whole live tank thing can be treacherous for the beginning cook. just-killed fish need to be cooked very gently (steaming, poaching), or they toughen and are flavorless.
also, often the freshest-tasting fish you can find is frozen. fish that has been carefully handled, quickly and carefully frozen, and then defrosted carefully is as good as fresh-caught any day.