158 



R. J. H. Beverton and S. J. Holt 



Beverton and Holt, 1957). There is evidence that both the 

 constants L^ and K have a physiological significance, as will 

 be mentioned later; at this stage we need only regard equation 



200 r 



I50- 



100 



Fig. 3. Growth data of Fig. 2 plotted as length at age t against length at age 

 < + !. The slope of the line drawn through the points is e-^ and the inter- 

 section with the bisector (shown as a broken line) gives an estimate of L. 



