1. THE PURPOSE OF THIS STUDY 

 Fishing removes the older, larger specimens from a given stock. These 

 older fish grow slower than the remaining younger fish, thus the mean growth 

 rate of the stock could change with fishing. Furthermore, the old age (or 

 senescent) mortality of the stock would decrease with the removal of older fish. 

 The interactions between fishing and rejuvenation can be expected to be 

 compensatory, and the results could affect management options. This numerical 

 study attempts to clarify quantitatively the effects of fishing on a stock. The 

 main objectives of the study were to: 



1) Determine quantitatively the effects of rejuvenation on the dynamics of 

 fish stocks. 



2) Determine how different species respond to fishing. 



3) Determine the nature of the interaction between fishing, rejuvenation, 

 and recruitment. 



This study pertains mainly to low to moderate levels of fishing, where most 

 interactions can be linearized. At higher levels of fishing (F > 0.3), when 

 definite "recruitment overfishing" occurs, many changes in the stock parameters 

 due to fishing are nonlinear. Another study is planned to examine "recruitment 

 overfishing" and the events leading to the stock collapse. 



