308 



Fishery Bulletin 101(2) 



40 



35 



30 



10 20 30 40 50 



Adjusted cumulative catcti (metric tons) 



60 



Figure 2 



The relationship between mean daily catch per unit of effort ( +SE ) and the 

 adjusted cumulative catch for Pnstipomoides filamentosus on the dropoff 

 at Saya de Malha Bank. Straight line shows the Leslie plot; CPUE^i, = 

 (?(S|||, - A',,), fitted by least squares linear regression (r-=0.729). 



attributed to changes in fishing method, bait type, or cur- 

 rent .strength, all of which remained constant. In addition, 

 weather condition, depth fished, and trip duration did not 

 have a .significant effect on the catch rate (P>0.0.5). 



The reduction in the daily catch per unit of effort with 

 increa.sing cumulative catch was significant iP<().0.'), 12 df, 

 F=9.T29). The results of the regression analysis, with the ad- 



justed cumulative catch as the independent variable and the 

 daily catch per unit of efTort as the dependent variable was 



.y = 43,633 -h 0.0006.V 



(r-=0.729). 



Application of the Leslie model with the catchability coeffi- 

 cient U/) = 0.0006 (±0.0001 SE) and intercept parameter (« ) 



