several days before finding the entrance to the fish 

 lift at Mactaquac Dam. 



Diel movement rates were monitored on 13 and 

 17 May (early migrants) and 26 and 30 May and 1 

 June (peak migrants). Movement was slowest from 

 1200 to 1700 h (Fig. 4). Nocturnal behavior was 

 strongest among the early migrants; peak migrants 

 had a higher rate of movement because they also 

 moved during the day (mornings only). A similar pat- 

 tern for landlocked adults was found by Kleerekoper 

 et al. (1961). 



In summary, except for the longer summer migra- 

 tion and the slower rate of upstream movement, the 

 behavior of sea-run sea lampreys in the Connecticut 

 and St. Johns Rivers was similar to that of the land- 

 locked sea lampreys in the Ocqueoc River. The 

 timing of the runs in relation to temperature and 

 the diel movement patterns appears very stable, 

 probably with important survival or reproductive 

 advantages. 



HOUR 



Figure 4.— Mean movement rates of early migrants (solid circles) 

 monitored 13 and 17 May (N = 13), and peak migrants (open 

 circles) monitored 26 and 30 May and 1 June 1982 (N = 7). (Ver- 

 tical lines show standard errors.) 



Acknowledgments 



We thank D. Stier, A. Richmond, J. Nicholson, T. 

 Clifford, C. Hall, J. Burnett, J. Bain, and J. Idoine 

 for assistance with field work. The project was 

 funded by Federal Aid Project AFS-4-R-21 and 

 Dingell-Johnson Project 5-29328 to the Massachu- 

 setts Cooperative Fishery Research Unit. We thank 

 Holyoke Water Power Company for providing space 

 for the holding tanks. 



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Kathleen Stier 

 Boyd Kynard 



Massachusetts Cooperative Fishery Research Unit 

 University of Massachusetts 

 204 Holdsworth Hall 

 Amherst, MA 01003 



753 



