Not that long ago, fish were only available locally near the places where they swam. With the advent of freezers, and canning techniques, fish could be transported anywhere.
Arctic sea life contains a high concentration of fats and oils required to sustain life in low temperatures. They are a good source of protein. In certain arctic cultures, fish and sea mammals were once the only food source available.
There is modern concern about pesticide, mercury, and garbage contamination in the seafood food chain. There are FDA recommendations on what is safe to eat, how much, and how often. Like other food, seafood is healthy in moderation.
At one point, farmed fish became a major player in the fish market. It seemed a good idea to build a giant pond, and raise as many of one species together as physically possible. Now, that is less favored. Raising a dozen or so in a large personal pond is safe, if the fish have plenty of room to swim, grow, eat, and meet their daily needs.
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