NOAA Technical Memorandum NMFS F/NWC-'*! 



A SINGLE SPECIES, BIOMASS BASED, TIME DEPENDENT 

 MODEL FOR INVESTIGATING THE EFFECTS OF FISHING 

 ON THE DYNAMICS OF FISH BIOMASS 



By 

 Taivo Laevastu and Richard J. Marasco 



Resource Ecology and Fisheries Management Division 



Northwest and Alaska Fisheries Center 



National Marine Fisheries Service 



National Oceanic and Atmospheric Administration 



2725 Montlake Boulevard East 



Seattle, Washington 98112 



January 1 983 



