they move toward shore and into the estuary. Two 

 primary factors that seem to affect growth are water 

 temperature and the amount of plankton "blooms" 

 present (Williams et al. 1968). Therefore, in Feb- 

 ruary and March, with some exceptions, as water 

 temperatures start to rise, collections will have larger 

 individuals by area than during colder months. By 

 considering a specific point along this route as larvae 

 move from offshore areas to the estuary and then by 

 looking at the monthly means, we note that size in- 

 creases seasonally. 



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1968. Standing crop and importance of zooplankton in a 

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Robert M. Lewis 

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Southeast Fisheries Center Beaufort Laboratory 

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 Beaufort, NC 28516-9722 



Dawson, C. E. 



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1971. Hydrographic properties and circulation of the North 

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1982. Age and growth of larvae and spawning time of 



SURVIVAL AND HOMING OF JUVENILE 



COHO SALMON, ONCORHYNCHUS 

 KISUTCH, TRANSPORTED BY BARGE 



During the winter and spring of 1976-77 the Pacific 

 Northwest experienced its worst drought in recent 

 times. Flow in the Columbia River, which is dammed 

 extensively for hydroelectric generation and irriga- 

 tion, was extremely low during the spring of 1977 

 (averaging < 4,245 m 3 /s). In low flow years, very little 

 water is diverted over spillways at the hydroelectric 

 projects. Consequently, many migrating juvenile 

 Pacific salmon, Oncorhynchus spp., and steelhead 

 trout, Salmo gairdneri, were destined in 1977 to pass 

 through the turbines, where substantial numbers 

 would be killed (Chaney and Perry 1976 1 ) unless 

 remedial steps were taken. Realizing that the losses 

 of juvenile salmonids could be catastrophic, the 

 National Marine Fisheries Service (NMFS) and the 

 U.S. Army Corps of Engineers (CofE) prepared two 

 barges to supplement trucking as a means of trans- 

 porting juvenile salmonids around dams on the 

 Columbia and Snake Rivers (McCabe et al. 1979). 

 To assess the effectiveness of barging, various ex- 

 periments were conducted. One, a joint activity by 

 NMFS, the U.S. Fish and Wildlife Service (FWS), 

 and C ofE , involved transporting tagged coho salmon, 

 Oncorhynchus kisutch, from Willard National Fish 

 Hatchery (Little White Salmon River), Wash., to a 

 release site on the Columbia River downstream from 

 Bonneville Dam (Fig. 1). Objectives of the experi- 



'Chaney, E., and L. E. Perry. 1976. Columbia Basin salmon and 

 steelhead analysis: Summary report; 1 September 1976. Pac. 

 Northwest Reg. Comm., Vancouver, Wash., 74 p. 



412 



FISHERY BULLETIN: VOL. 81, NO. 2, 1983. 



