856 



Fishery Bulletin 98(4) 



20 



10 - 



5 - 



■> larvae 

 -• — zooplankton 



35,000 



30,000 



- 25,000 



P 



20,000 S 



15,000 



10,000 



5,000 



9 10 11 12 



20 



30,000 



20.000 



10,000 



10 11 12 



Figure 2 



Monthly mean catch per 10 m^ o( Limanda ferruginea larvae, Calanus sp., and Pseudocala- 

 tuis sp. in Georges Bank for years 1977-87. 



with 7 days and 1980 with 3.9 days in GB. In SNE, the 

 weakest year class (1982) possessed the greatest (At,^) span 

 with 9.9 days. 



Variability in timing between peaks in predator and 

 prey abundance 



Examinations of matches and mismatches of larval food 

 and time of yellowtail spawning are shown by the occur- 

 rence of width displacements and overlaps from larvae 



(5) and its zooplankton prey (a). The relationship between 

 yellowtail larvae and Calanus sp. for SNE display definite 

 matches for years 1980, 1986, and 1987. A slightly larger 

 gap existed between peaks for the year class 1982 (Fig. 4). 

 During the strong year classes 1980 and 1987, density of 

 yellowtail larvae peaked afterthat of Ca/a/H/>s sp., whereas 

 the reverse occurred in the weaker year classes 1986 

 and 1982. Similar patterns occurred with the peak spawn- 

 ing and peak production relationships between yellowtail 

 larvae and Pseiidocalanus sp. The year classes 1982 and 



