Freshwater fish from cold waters, like lake herring, lake trout, salmon, and whitefish, are also high in omega-3s.

CNN: How to buy the best fish

Such an alteration would be needed to allow freshwater fish eggs to survive and travel far in salt water.

ECONOMIST: Fish genetics

Swiri, named after a tiny freshwater fish native to the Korean Peninsula, is so popular that even the South Korean army is considering screening the movie to motivate troops.

CNN: ASIANOW - TIME Asia

In his love of angling for trout and other freshwater fish, Walton used a long rod of spliced ash and hazelwood, with a line of about the same length as the rod, made out of woven hair from a horse's tail.

WSJ: It Has Hooked Generations of Fishermen | Izaak Walton | The Compleat Angler | By H. George Fletcher

Mr. Dohlin realized that 300 to 500 freshwater koi fish would die when the saltwater surge flooded their pond.

WSJ: Getting Back In the Swim After Sandy

Green MSP Robin Harper's amendment, which urged the government to phase out the rearing of smolt or juvenile fish in freshwater open net-pens, fell, with two MSPs voting for it and 114 voting against it.

BBC: Decision time

For example, freshwater systems polluted with excess agricultural fertiliser will suffocate with algae, killing off fish and making water unfit for human consumption.

BBC: Nature loss 'to damage economies'