Americans and Brits are eating increasing amounts of fish, according to new research from feed giant Cargill, and they are demanding it stay healthy.

In its latest Feed4Thought survey, Cargill found that over the past five years 44 percent of American and British consumers surveyed had added more fish to their diets. Poultry came in a close second, followed by beef and pork.

"More and more people are choosing fish as a source of protein because of its big impact on health and relatively small impact on our planet," said Dan Burke, group director for Cargill's aqua nutrition business in the United States and United Kingdom.