LIST OF FIGURES Figure ix Page 11 13 18 20 22 1 Relationship between population size and mature progeny .. . 2 Quadratic sustainable yield function ......... 3 Equilibrium yield relationships for various values of m . .. . 4 Allocation of fishing effort between fishing grounds of different productivity or location .. ... 5 Cost and revenue in an unregulated fishery with constant product price .. ........ 6 Phase diagram for equilibria between vessels and resource stock in an open access fishery ... 7 Open access equilibrium and maximum economic yield in a fishery with constant product price ... 8 Open access equilibria and maximum economic yield in a fishery with variable product price .... 9 Equilibrium in a multi-sector fishery with variable price and pecuniary externalities .. 10 Principal fishing grounds in the Gulf of Mexico Reef Fish Fishery . . 11 Estimated relative fishing power for proportionate increases in average crew size and vessel size ... 12 Iso-fishing power contours for selected levels of relative fishing power ....... 13 Derived equilibrium catch equations for the Gulf of Mexico Reef Fish Fishery .. ... 14 Optimum number of vessels corresponding to maximum economic yield for increasing levels of average fishing power . . S. 30 S. 38 39 48 . 62 . 82 .. 87 . 92 S. 117