ROCK SALMON-WHAT IS IT??? it's non-kosher canned salmon

From Wikipedia encyclopedia: Rock Salmon is the flesh of the dogfish, wolffish or catfish, also known as hass/huss. [Non-kosher, of course- Y.S.] Renamed by marketeers to make the fish more appealing to consumers. it is from the Shark family.

Note: Canned skinless and boneless Rock Salmon has the flesh texture an reddish color of late season canned salmon- Per US Fisheries Department the one way to differentiate the difference is by a simple sodium test. As canned Salmon has a few grains of salt put into the can prior to cooking the raw salmon in the can. Rock Salmon does not have any salt put in the can prior to cooking the raw Rock Salmon.

Therefore, flesh color of salmon is not reliable