CONDREY: DENSITY-DEPENDENT SEARCHING TIME 



25 - 



20 40 60 80 



EQUILIBRIUM POPULATION DENSITY 



100 



20 - 





 U 



L 



L 15 



I 



U 

 M 



10 - 



5- 



B 



y\ *■-: }-<. /? 

 / / !/ }/ ! 



' / / / 



/ /I /; /j 



/ / / A ' / 



I / / Y / / / 



I : / / i - / / 

 ,'.V' I.// 



2 4 "5 8~ 



EQUILIBRIUM (ft') 



10 



12 



20 -U.D 



20 40 60 80 



EQUILIBRIUM POPULATION DENSITY 



100 



1 



1 8 - \\\ ' 



z 



w 16 



y 



u. 



u, 



8 14 

 O 



5 1 2i 



< 

 z 

 o 



lu 08 

 K 



2 



< O 06 



04 



02 



|\ 



W\ \ 

 \\\ \ 



\\ \ \ 



\\ \ 



\\ \ 



\ \ \ 



\ 



\ V3 



4 \ 



X 



20 40 60 80 



EQUILIBRIUM POPULATION DENSITY 



100 



FIGURE 2. — Effect of variation in the ratio of handling time W. ) 

 to total fishing time (t ' ) on the relationship between (A) equilib- 

 rium yield, Y , and the equilibrium biomass of the stock, B g , 



(B) Y and the product of t' and equilibrium fishing gear; 



(C) searching time andB ; (D) catchability incorrectly estimat- 

 ed as ql(\ + q  t'  B ) andB ; and (E) equilibrium/"'  t' and B . 

 The model used is Equation (5) where B x = 100, k = 1, and q = .2. 



20 40 60 80 100 



EQUILIBRIUM POPULATION DENSITY 



451 



