750 



Fishery Bulletin 88(4), 1990 



10 







5^ 



5 



c 

 o 5 



|o 



U- 5 





 21 



I 

 60 



Station 



Jul 



Aug 



Aug 



Aug 



Sep 



Sep 



J 



Oct 



Oct 



Nov 



n n rtimn 



 1 



-M— n 



21 60 21 60 

 Age Days 



.MIMJ. 



21 



1 1 



\ 



v- 



60 100 



Figure 6 



A^t* of weakfish estimattni from scale circuli for 

 1984, versus frequency (iiumber/2-niinute tow). Ijy 

 station, date, and cohort in Chesapeake Bay-York 

 River, VA. Cohort 4 = solid bars, cohorts = open 

 bars. 



Essig and Cole 1986, Jenkins 1987, Post and Pranke- 

 vicius 1987), or that fewer studies have examined 

 postmetamorphic life stages because juvenile survival 

 after metamorphosis was considered relatively con- 

 stant compared with larval stages (Gushing 1975, Vic- 

 tor 1986). Constant growth and mortality in postmeta- 

 mori)hic juveniles have lieen questioned; for example. 

 Wicker and Johnson (1987) showed a large increase in 

 the rate of mortality in age-0 largemouth hass Microp- 

 terus ^almiiides when juveniles shift from an inverte- 

 brate to fish diet. Van der Veer and Bergman (1987) 

 suggested that mortality due to predation by shrimp 

 Crangon crangon on newly settled juvenile plaice 

 Pleuronectes platessa may be significant and thus ac- 

 count for the difficulty of predicting year-class abun- 

 dance based on egg and larval surveys. However. 



