This study describes the organizational and financial structure, and operational activities of U.S. fishery cooperatives in 1980. Major aspects treated include observance of cooperative principles, eligibility and size of the membership and the board, types of fishery cooperatives-marketing, supply, and service.activities performed, balance sheet and operating statement data, and equity composition and redemption. Selected data are reported for all responding cooperatives, and reported in detail for finfish, lobster, and shrimp cooperatives as groups.