In fact, the aforementioned criteria constitute a non-permit required confined space. A permit required confined space â more specifically, entrance to a permit required confined space â should be limited only to workers with the proper permit. This is due to the inherent hazards within this type of confined space.
Salmon farming is a type of aquaculture where the fish are grown in net cages, typically located in sheltered bays and fjords along the coast. Salmon are hatched in brood hatcheries and grown in freshwater until they are large enough to transfer to marine pens.
A hatchery is a fish farm, and fish farming in the Columbia River Basin has been utilized since the late 1800s to provide salmon and steelhead for harvest, particularly commercial harvest, and to compensate for fish losses caused by human activities such as the destruction of fish habitat and construction of dams.