We know how many salmon there are and how many we can catch. Because salmon return to the same place every year to spawn, it is easier to count the population and figure out the number of salmon that can be caught each year without long-term damage to their numbers.
We know how to catch salmon without significantly hurting the marine environment. Greenberg says we have figured out how to responsibly catch salmon using methods that do not harm other fish. Although marine mammals are occasionally caught in the nets, it is not nearly as bad as the longlines used for tuna, which can be hundreds of miles in length and ensnare sea turtles and sharks.
The species of salmon used in canned salmon eat lower on the food chain than tuna, and are thus lower in toxins. While the kinds of tuna used for canning are not the largest of the family, they are still higher on the food chain than the pinks, chums and sockeyes used for canned salmon, which prey on small crustaceans and plankton.
• Read more: A Tale of Two Cans: Why Canned Salmon Is Better Than Tuna at the Atlantic
Do you eat canned salmon? Do you have any other recommended alternatives to canned tuna?