FISHERY BULLETIN: VOL. 81, NO. 2 



does not require elevated swimming speed since 

 Atlantic menhaden swimming at a routine speed of 

 12.2 cm/s could accomplish the distance between 

 Rhode Island and Cape Hatteras, N.C., well within 

 the 3-4 mo duration of the spring and fall migra- 

 tions. 



ACKNOWLEDGMENT 



We thank Peter Verity and Thomas Smayda for 

 their assistance in the experimental studies on 

 menhaden, Captains Harold Loftes and Charles 

 Follett for enabling us to obtain the menhaden, and 

 Theodore Smayda for permitting us to use his 

 laboratory facilities. We also thank Ernesto Lorda 

 and Christopher Langdon for their derivation of 

 Equations (33)-(45), Elizabeth Watkins and Marian 

 McHugh for drafting the figures, and Patricia Degi- 

 dio for preparation of the manuscript. We express 

 our thanks to the National Science Foundation for 

 support of this research through Grants OCE 

 7602572 and OCE 7919551. 



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