That is correct. A conservation unit would be nested within a broader management zone. For Pacific salmon conservation units, designatable units are used to describe areas that specific populations or subpopulations use to spawn and reproduce. That is one unit of measure that could be used, but it can also be scaled up if we wish to address migratory areas as well as just the spawning and nursery areas for those fish.
On May 24th, 2018. See this statement in context.