Hart: Yield- and biomass-per-recruit analysis of rotational fisheries 



49 



Yield-per-recruit curves for 6 yr symmetric rotation (i.e. 

 closed for three years and then opened for three years), 

 10-yr symmetric rotation, 6-yr pulse rotation, and no 

 rotation are given in Figure 7. Symmetric rotation gives 

 yields-per-recruit that lie between that of pulse rotation 

 and constant fishing. Maximum yield-per-recruit. together 



with the associated B^^x, and maximal discounted yield 

 for pulse rotation, with and without 15'^'i incidental mortal- 

 ity, and for symmetric rotation without incidental mortal- 

 ity, are given for various rotation periods in Table 2. 



Results from yield-per-recruit runs with incidental 

 fishing mortality (Table 2B) show similar patterns to 



