In fact large fish like sharks, tuna and swordfish feed on smaller fish and can accumulate high levels of environmental pollutants like mercury.

CNN: Beware of shark meat, FDA warns

Moreover, much of the flood-plain is actually forest, which provides a particularly nutritious array of rotting leaves for the fish to feed on.

ECONOMIST: The Mekong river

It releases a surge of warm water from the equator which kills off the plankton causing the fish which feed on them to die of starvation and driving the survivors south into Chilean waters.

ECONOMIST: The unkind child

On average fish gobble 2 pounds of feed to produce a pound of flesh.

FORBES: Entrepreneurs

Resistance from local fishermen slowly turned into support when they realized they could get steady work delivering feed and materials to the farm sites while transporting harvested fish back to shore on a scheduled basis.

FORBES: Regulatory Uncertainty Drives A Fish Farmer To Foreign Waters

Take too many menhaden and you damage the populations of bluefish and striped bass that feed on them. (Not so, says the company.) At the moment Omega Protein is allowed to fish only in the waters off six states, and two of those have caps on its harvests.

FORBES: Magazine Article