722 



Fishery Bulletin 92(4), 1994 



did not attempt, however to identify environmental 

 (Prager and MacCall, 1993) or ecological factors that 



may have affected northern anchovy abundance in 

 recent fishing seasons. 



o 

 o 



o 



to 



V) 



< 



I 



O 



1.400 

 1.200 

 1.000 



800 ' 



000 



400 



200 



1.400 

 1.200 

 1.000 

 800 

 BOO 

 400 

 200 



LOW RECUITMENT. LOW F 



1986 1987 19 



1989 1990 1991 



BEST FIT RECRUITMENT. LOW F 



1987 1988 19 



HIGH RECRUITMENT. LOW F 



1990 1991 



1986 1987 



1989 1990 1991 



ALTERNATING RECRUITMENT. LOW F 



1.400 

 1.200 

 1.000 

 800 

 600 

 400 

 200 



1.400 



1.200 



1.000 



800 



600 



400 



200 



1.400 

 1.200 

 1.000 

 ■00 

 800 

 400 

 200 



LOW RECRUITMENT. HIGH F 



1986 1987 1988 1989 1990 1991 



BEST FIT RECRUITMENT. HIGH F 



1986 1987 1988 19 



HIGH RECRUITMENT. HIGH F 



1990 1991 



ALTERNATING RECRUITMENT, HIGH F 



FISHING SEASON 



Figure 4 



Northern anchovy, Engraulis mordax, biomass results (age 1+ on 15 February in thousands of metric tons) for the 

 1985 to 1991 fishing seasons from simulation analyses. Each panel contains results for one recruitment pattern 

 (low, best fit, high or alternating) and one fishing mortality pattern (low or high). The "TRUE" line in each panel is 

 the true biomass assumed in the simulations. The "AVERAGE" line is the mean of biomass estimates from fifty 

 simulations. Estimates from simulation analyses were not corrected for bias. 



