FISHERY BULLETIN: VOL. 80, NO. 4 



thought to be daylight or crepuscular feeders 

 (see Bailey et al. 1975; Godin 1981 and references 

 therein), they may never encounter this night- 

 time increase in zooplankton abundance. 



The studies of Healey (1980) and Simenstad et 

 al. (1980 7 ) both suggest that food availability 

 may affect the abundance of juvenile salmon. 

 They found that fewer salmon remained in 

 Georgia Strait (British Columbia) and Hood 

 Canal (Washington), respectively, when feeding 

 conditions were poor. Obviously, the question of 

 ocean limitation of salmon production cannot be 

 resolved until much more is learned about the 

 ecology of juvenile salmon and their competitors 

 in the coastal zone. Substantially more informa- 

 tion is needed on the abundance and availability 

 of prey in near-surface waters, as well as on feed- 

 ing, growth rates, and migration patterns of 

 juvenile salmon. 



ACKNOWLEDGMENTS 



This research was made possible by funding 

 provided by the Oregon Department of Fish and 

 Wildlife (ODFW), Pacific Marine Fisheries 

 Commission, Oregon State Sea Grant College 

 Program, Oregon Aqua-Foods Inc., Crown Zel- 

 lerbach Inc., and Anadromous Inc. We are in- 

 debted to the Northwest and Alaska Fishery Cen- 

 ter of the National Marine Fisheries Service for 

 the loan of the purse seine. James Lichatowich, 

 Thomas Nickelson, and Jay Nicholas (ODFW), 

 Charles Simenstad (University of Washington), 

 and two anonymous reviewers made helpful 

 comments on the manuscript. 



LITERATURE CITED 



Alton, M. S., and C. J. Blackburn. 



1972. Diel changes in the vertical distribution of the 

 euphausiids, Thysanoessa spinifera Holmes and Eu- 

 phausia pacifica Hansen, in coastal waters of Washing- 

 ton. Calif. Fish Game 58:179-190. 



Bailey, J. E., B. L. Wing, and C. R. Mattson. 



1975. Zooplankton abundance and feeding habits of pink 

 salmon, Oncorhynchus gorbuscha, and chum salmon, 

 Oncorhynchus keta, in Traitors Cove, Alaska, with specu- 

 lations on the carrying capacity of the area. Fish. Bull., 

 U.S. 73:346-861. 



7 Simenstad, C. A., W. J. Kinney, S. S. Parker, E. 0. Salo.J. R. 

 Cordell, and H. Buechner. 1980. Prey community structure 

 and trophic ecology of outmigrating juvenile chum and pink 

 salmon in Hood Canal, Washington. Final rep. (1977-79) No. 

 FRI-UW-8026, 113 p. University of Washington, Fisheries 

 Research Institute, Seattle, WA 98195. 



Bowman, T. E., C. D. Meyers, and S. D. Hicks. 



1963. Notes on associations between hyperiid amphipods 

 and medusae in Chesapeake and Narrangansett Bays 

 and the Niantic River. Chesapeake Sci. 5:141-146. 

 Brett, J. R. 



1971. Satiation time, appetite, and maximum food in- 

 take of sockeye salmon (Oncorhynchus nerka). J. Fish. 

 Res. Board Can. 28:409-415. 

 Eggers, D. M. 



1977. Factors in interpreting data obtained by diel sam- 

 pling of fish stomachs. J. Fish. Res. Board Can. 34:290- 

 294. 

 Fresh, K. L., R. D. Cardwell, and R. R. Koons. 



1981. Food habits of Pacific salmon, baitfish, and their 

 potential competitors and predators in the marine 

 waters of Washington, August 1978 to September 1979. 

 Wash. Dep. Fish. Prog. Rep. 145, 58 p. 

 Godin, J.-G. J. 



1981. Daily patterns of feeding behavior, daily rations, 

 and diets of juvenile pink salmon (Oncorhynchus gor- 

 buscha) in two marine bays of British Columbia. Can. 

 J. Fish. Aquat. Sci. 38:10-15. 

 Harbison, G. R., D. C. Biggs, and L. P. Madin. 



1977. The associations of Amphipoda Hyperiidea with 

 gelatinous zooplankton.— II. Associations with Cnidaria, 

 Ctenophora, and Radiolaria. Deep-Sea Res. 24:465- 

 488. 

 Healey, M. C. 



1980. The ecology of juvenile salmon in Georgia Strait, 

 British Columbia. In W. J. McNeil and D. C. Hims- 

 worth (editors), Salmonid ecosystems of the North 

 Pacific, p. 203-229. Oreg. State Univ. Press, Corval- 

 lis. 

 Hebard, J. F. 



1966. Distribution of Euphausiacea and Copepoda off 

 Oregon in relation to oceanographic conditions. Ph.D. 

 Thesis, Oregon State Univ., Corvallis, 85 p. 

 Lane, E. D., M. C. S. Kingsley, and D. E. Thornton. 



1979. Daily feeding and food conversion efficiency of the 

 diamond turbot: an analysis based on field data. Trans. 

 Am. Fish Soc. 108:530-535. 

 Lough, R. G. 



1975. Dynamics of crab larvae (Anomura, Brachyura) 

 off the central Oregon coast, 1969-1971. Ph.D. Thesis, 

 Oregon State Univ., Corvallis, 229 p. 



1976. Larval dynamics of the Dungeness crab, Cancer 

 magister, off the central Oregon coast, 1970-71. Fish. 

 Bull., U.S. 74:353-376. 



Manzer, J. I. 



1969. Stomach contents of juvenile Pacific salmon in 

 Chatham Sound and adjacent waters. J. Fish. Res. 

 Board Can. 26:2219-2223. 

 Okada, S., and A. Taniguchi. 



1971. Size relationship between salmon juveniles in 

 shore waters and their prey animals. Bull. Fac. Fish., 

 Hokkaido Univ. 22:30-36. 

 Peterson, W., and C. Miller. 



1976. Zooplankton along the continental shelf off New- 

 port, Oregon, 1969-1972: distribution, abundance, sea- 

 sonal cycle and year-to-year variations. Oreg. State 

 Univ. Sea Grant College Prog. Publ. ORESU-T- 76-002, 

 111 p. 



Richardson, S. L., and W. G. Pearcy. 



1977. Coastal and oceanic fish larvae in an area of up- 

 welling off Yaquina Bay, Oregon. Fish. Bull., U.S. 75: 

 125-145. 



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