Optimum yield (OY) means the amount of fish that:
(1) Will provide the greatest overall benefit to the Nation, particularly with respect to food production and recreational opportunities, and taking into account the protection of marine ecosystems;
(2) Is prescribed as such on the basis of the maximum sustainable yield from the fishery, as reduced by any relevant economic, social, or ecological factor; and
(3) In the case of an overfished fishery, provides for rebuilding to a level consistent with producing the maximum sustainable yield in such fishery.
50 CFR § 600.10
Unless defined otherwise in other parts of Chapter VI, the terms in this chapter have the following meanings: