manner, and used three habitats: a low-flow turbid 

 area, a 10 m deep channel, and sandy shoals up- 

 stream from the outlet. Movements at the S-curve 

 (Fig. 1) and at other holding areas were highly 

 variable: some remained in a small discreet area, 

 others were inactive for long periods, and the rest 

 moved actively within a 0.5 km reach of the river— 

 similar to the movements at Cabot Station and at 

 the Northampton Oxbow. 



Striped bass followed several patterns of diel 

 behavior. At Cabot Station, which has outside il- 

 lumination at night, four moved actively during both 

 the day and night. Koo and Wilson (1972) also found 

 that adult striped bass were active at night in il- 

 luminated areas. At sites with natural illumination, 

 the movements of 10 striped bass were as follows: 



9 moved actively during the day; 6 stopped and 3 

 were less active at night; and 1 moved only at night. 

 Of the 14 striped bass that we observed for 24 h, 



10 increased their activity at dawn, dusk, or both. 

 Dudley and McGahee (1983) found that adults were 

 most active in late afternoon or evening, but noted 

 an increased activity at dawn. Because striped bass 

 feed most actively at dawn and dusk (Raney 1952), 

 the increase in activity during these periods was pro- 

 bably related to feeding. 



Based on the results of fish passage at Holyoke 

 Dam, behavioral observations using telemetry, and 

 the general thermal niche of subadults reported by 

 Coutant and Carroll (1980) and Coutant (1985), we 

 hypothesize that the movement of subadult striped 

 bass into the Connecticut River is due in part to ther- 

 mal preferences. The upriver migration in May-July 

 places subadults in temperatures closer to their 

 preferred range than those found in Long Island 

 Sound. Tracking of fish in the river indicates a 

 diverse behavioral range of active swimming, rest- 

 ing, and feeding that is consistent with a spring- 

 summer period of high activity and growth. Local 

 attraction to dam tailwaters provides access to abun- 

 dant food (Warner and Kynard 1986), a feature that 

 reinforces the advantages of following thermal cues 

 into the riverine environment. The feeding advan- 

 tages for striped bass will likely increase as the 

 restoration program for American shad and blue- 

 back herring results in an increased abundance of 

 juveniles. 



Acknowledgments 



This research was supported by Federal Aid Pro- 

 ject AFS-4-R-21 and Dingell-Johnson Project 5- 

 29328 to the Massachusetts Division of Fisheries and 

 Wildlife and the Massachusetts Cooperative Fishery 



Research Unit. The radio telemetry study was a por- 

 tion of a thesis submitted by John P. Warner in par- 

 tial fulfillment of the requirements of the M.S. 

 degree from the Graduate School, University of 

 Massachusetts, Amherst. We thank Holyoke Water 

 Power Co. for providing the space for our holding 

 tanks. 



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