Terwilliger and Munroe: Age, growth, longevity, and mortality of Symphurus plagiusa 



349 



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January 



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February 



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30 

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March 



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_ June 



Length (mm) 



Figure 7 



Seasonal progression of modal length frequencies for 

 blackcheek tonguefish, Symphurus plagiusa, from lower 

 Chesapeake Bay and major lower tributaries, 1993-96. 



low), it also seems equally possible that the popula- 

 tion of blackcheek tonguefishes residing in Chesa- 

 peake Bay could be of more recent origin because all 



July 



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August 



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 100  

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September 



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300 



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October 



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November 



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uu 



December 



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Length (mm) 



Figure 7 (continued) 



other major populations for this species are known 

 to occur only in areas further to the south. If indeed 

 this is the case, then life history parameters esti- 

 mated for blackcheek tonguefishes from Chesapeake 

 Bay are those characterizing a peripheral popula- 

 tion of the species. Comparisons of these estimates 



