and recoveries are weighted in proportion to the distribution of the population, then it will be 

 necessary to catch about 2,000 tons of fish in order to obtain 200 recoveries (which will satisfy the 

 condition of a minimum of 10 recoveries per area): 



As indicated, each recovery will be made in the area in which the tag was put out. 



But suppose that, instead of no mixing, the fish mix thoroughly between spawning seasons and 

 the fish sort out at random to the three areas in the next season. If the catch is again weighted in 

 proportion to the distribution of the population and a catch sufficient to give 200 recoveries is again 

 made, the recoveries will be distributed as follows: 



In this situation, all of the southern California offshore recoveries and the recovery of south- 

 ern California offshore tags in the Lower California inshore area fall below the minimum require- 

 ment of 10. This could be prevented by (1) originally putting out more tags in the southern 

 California offshore area and/or (2) catching more fish (increasing the number of recoveries) in the 

 southern California offshore area . 



If the number of tags put out in the southern California offshore area were increased from 

 1,000 to 4,000, then, with the same catch the recoveries would be: 



122 



