APPQ.'DIX "B" 



Method for Determining Size Composition of the Catch in Relation 

 to Available Population for Bullrakmg and Dredging (Figure 7~?1 



lo Data for 19^0 were used since the clamshell bucket sampling for 

 that year was more intensive than for 19U9« 



2. Size composition of the catch v/as taken from Table U. 



3. Size composition of the available population before fishing was 

 estimated by adding catch from Table h and population remaining 

 after fishing from Table 3- 



U. Ratios of catch to available population were computed by 10 ram. 

 intervals of length and adjusted to 1,0 for that part of the 

 size range where the gear was at maximum efficiency. 



5. Since different multipliers were necessary to adjust raking and 

 dredging efficiencies to i.O the two curves are comparable only 

 in regards to the lengths at which various efficiency ratios 



are reached. 



32 



