All salmon/trout species are anadromous. They all can tolerate salt or salt water. However they all do not migrate or often times cannot.
Remember, the "sea run" thing means that they are born in fresh water and live their lives in the salt only to migrate to fresh water to spawn.
Those born in fresh with no practical link to the salt are just freshwater fish.
Salt is often used as a treatment in aquaculture of trout and salmon. It has a calming effect on stressed fish and reduces their propensity to develop bacterial infections.
Remember, the "sea run" thing means that they are born in fresh water and live their lives in the salt only to migrate to fresh water to spawn.
Those born in fresh with no practical link to the salt are just freshwater fish.
Salt is often used as a treatment in aquaculture of trout and salmon. It has a calming effect on stressed fish and reduces their propensity to develop bacterial infections.