10. Stratified mean catch (number) per tow of Atlantic mackerel by year class from the 1973-76 



U.S. spring bottom trawl surveys in ICNAF Subarea 5 and Statistical Area 6, strata 1-25, 61-76 . . 8 



11. Atlantic mackerel catch per standardized U.S. day fished 8 



12. Atlantic mackerel stock size by age in ICNAF Subareas 3, 4, and 5 and Statistical Area 6 (millions 

 of fish) derived from cohort analysis assuming natural mortality (M) = 0.30 and fishing mortality 



OF) = 0.39 at ages 4 and older in 1977 9 



13. Percentage of fishing mortality (F) of Atlantic mackerel at ages 1 and 2 compared with mean F 



at ages 3 and older (partial recruitment) 11 



14. Summary of parameters used in the Atlantic mackerel assessment 11 



15. Projected Atlantic mackerel catch in ICNAF Subareas 3, 4, and 5 and Statistical Area 6 in 1978 

 with fishing mortality ranging from 0.00 to 0.70, and the resulting spawning stock in 1979 and its 

 percentage change from 1978 11 



IV 



