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INTRODUCTION We summarized and evaluated supplementation of salmon and steelhead with special reference to the Pacific Northwest. In some cases projects were reviewed where natural runs had been extirpated and were being reestablished or where runs were being established in areas upstream of barriers. In Alaska, the term "enhancement" is used when referring to supplementation. However, the Alaska enhancement includes many fish stocking scenarios which are for increasing commercial harvest opportunities and do not address supplementing natural runs. We have termed this type of hatchery production as "harvest augmentation." Harvest augmentation occurs in many other areas including the Columbia River. The following definitions are used in this report: Supplementation -Planting all life stages of hatchery fish to enhance wild/natural stocks of anadromous salmonids. Restoration -Planting hatchery products and/or improving habitat to reestablish extirpated runs or runs that are critically low in numbers. Enhancement - A general term that describes many stocking and habitat improvement scenarios used to improve fish runs. Enhancement can include supplementation, colonization, restoration and harvest augmentation. Colonization -Describes establishing anadromous salmonids in areas where historically the species was not endemic. Harvest augmentation -The stocking of anadromous fish where the primary purpose is to return adults for sport, tribal or commercial harvest. Rebuilding -Planting hatchery products to augment natural runs of salmon and steelhead. In this report used synonymously with supplementation. Hatchery stock - Having'been hatched and partially reared in a hatchery or other artificial production facility. Wild stock -Naturally reproducing stocks of fish that have not been supplemented or augmented with hatchery fish. Natural stock -Naturally reproducing stocks of fish that have been at one time supplemented with hatchery fish. 1