IME, supermarket fish for human consumption carries risks of pathogens not associated with prepared fish food for aquarium fish. Reason being is, because fish for human consumption are not treated for pathogens like many aquarium fish foods are. Most human seafood gets cooked and pathogens die. Fresh raw seafood is the risk. If you take this route in feeding your fish, keep it minimal...maybe even cook it a little and definitely soak it in garlic. I personally avoid human seafood for aquarium fish. Yes...it's a wallet saver (I've done it myself), but the risk, if it were to happen can be much more costly.
roka64...do your cats know mine??? LOL...
We, as a people, know so much more about outer space than we do about our own oceans. This lack of knowledge can very well spell the dangers that lay in wait for us.
The oceans surely would swallow us before a rock comes down to smite the planet of it's life.