1) Last year, only four Snake River sockeye salmon reached their breeding grounds.

2) Sockeye salmon may use their ultraviolet perception to see food.

3) Nailing down the differences between sockeye and chinook salmon could take years, however.

4) That's exactly what the Sockeye Salmon does – normally blue and silver they turn red and green before spawning.

5) Traditionally, most of the pink salmon catch has gone into cans, as a less expensive alternative to sockeye.

6) Once the $325 million project is completed, locals will greet returning pink, Chinook, Coho, chum and Sockeye salmon—as well as the animals that rely on them, like black bears and bald eagles.

7) On the other, conservation authorities worry that overfishing will deplete the sockeye and chinook salmon stocks plying the Pacific Northwest waters.

8) Everybody needs vitamin D, which can be found in foods like sockeye salmon, eggs, and milk.

9) It tells you how sustainable different fish are, as well as what the best choice is for any given species (e. g. , coho salmon vs. sockeye salmon vs. chinook salmon).