702 



Fishery Bulletin 92|4). 1994 



wise unused muscle throughout the remainder of the 

 year might consume energy that could otherwise be 

 budgeted toward growth, foraging, or predator avoid- 

 ance and thus increase the individual's chances of 

 reproducing again. Seasonal hypertrophy and atro- 

 phy of the sonic muscles ensure peak mass only at 

 the appropriate time. This cycle is presumably driven 

 by an indicator of the proximity of the spawning sea- 

 son, such as day length and correlated temperature 

 changes, operating through changes in plasma an- 

 drogen levels. 



Acknowledgments 



This work was supported by the Wallop-Breaux Sport 

 Fishing Act with funds administered through the 

 Delaware Department of Natural Resources and 

 Environmental Control. We would like to thank C. 

 V. Sullivan and his students for the use of their labo- 

 ratory and for their help in determining plasma 11- 

 ketotestosterone levels. The knowledge and experi- 

 ence of Donald Evans was crucial in the collection of 

 specimens. The support of P. Marvil, E. Bjorkstedt, 

 and V. Connaughton was invaluable and greatly ap- 

 preciated. 



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