BIOSTATISTIC AL ANALYSIS 33 



TABLE. 2. Actual and Simulated Catches of Sockeye Sal- 

 mon IN 1959 IN Convention Waters Using Simu- 

 lation Model No. 2 (See text) 



Actual Simulated 



U. S. Purse seines 1,401,819 1,251,200* 



U. S. Gill nets 241,163 293,090 



U. S. Reef nets 163,093 154,770 



Total U. S. Catch 1,810,738 1,699,100 



Total Canadian Catch 1,581,883 1,634,300 



Total Catch 3,392,621 3,333,400 



^■'Note the discrepancy between the actual and simulated purse seine and gill net 

 catch was caused by the use of "normaT' relative efficiency factors rather than the 

 actual relative efficiency factors which were unusually high for purse seines in 1959. 



penses during the season. The total fixed expenses to equip and ready 

 the fleet to fish are calculated from the total number of units of each 

 type of gear that is available to fish on the maximum or peak day 

 during the season. The catch and numbers of each species are calcu- 

 lated for each type of gear and multiplied by an average weight and 

 a price per pound to give the dollar value of the catch of each species. 

 A list of the values for the pertinent constants for the economic sector 

 that was used in the calculations which follow is given in Table 3. 

 Some idea of the actual extent of the computer calculations for the 

 economic sector can be had by scanning the dictionary of definitions 

 for code names given in the Appendix. 



The economic yield obtained by varying the amount of gear was 

 computed for different gear levels and run sizes. The relative changes 

 give a good picture of the behavior of the economy of the fishery 

 under changes in the amount of gear operating. In Fig. 17, the net 

 economic yield in dollars is given for each of the three major gear 

 types for a "standard" size run. The levels of gear intensity investi- 

 gated in this figure are the present level, one-and-a-half times the 

 present level, two-thirds of the present level, and one-half of the 

 present level. It is apparent that the total economic yield climbs 

 steadily as gear is reduced. It should be kept in mind that the in- 



