(boating, rafting, canoeing, photography, wildlife viewing, and dip netting); complementary fishing activities (fishing trip for sockeye, grayling, and Dolly Varden); and opinions about management issues (limit guides, limit motorized boats, and increase access or services). Table 1 list and defines these variables.
The HTCM question represent the shift in the demand for chinook salmon sport fishing based on the different possible management options. Under a doubling of the harvest of chinook salmon, the intercept shifts up from (a1), to a1+a2. Under a doubling of the daily bag limit the intercept is a1+a3, and with a season bag limit of five, the intercept is a1+a4. The change is net benefit can be estimated by calculating the consumer surplus under each shift in the demand for chinook salmon sport fish trips. The statistical significance of the change in consumers surpluss can be examined with a t-test on the difference between the actual and hypothetical intercepts.
C. Variable Construction
The dependent variables used in equation(2) are derived from responses to survey question on the number of trips actually made and the number of trips that would have been made under three hypothetical management option. The explanatory variables are also based on data received in the survey. The construction of the travel cost or price variable used in the Gulkaana River visitation rate equations follow standard methods (Cesario 1976; Cesario and Knetsch 1976; McConnel and Strand 1981; Smith, Desvousges, and MvVivney 1983; and McCollum 1986). The travel cost equation is composed of two costs-direct costs and the opportunity cost of time. Direct cost consist of expenditures on market goods incurred to travel to a site. The opportunity cost of time is an estimate of the cost of an inddividual's time while they are traveling to a fishing site. The following equation was used to develop the travel cost variable required for equation(2),