prey in the stomachs was not equal. Cephalopod 

 beaks are not always passed through the intes- 

 tinal tract and may remain in the stomach for 

 several days before they are regurgitated (Pitcher 

 unpubl. data). This increases the probability of 

 detection thereby exaggerating estimates of their 

 utilization. 



Acknowledgments 



This study was supported in part by the Bureau 

 of Land Management through an interagency 

 agreement with the National Oceanic and Atmo- 

 spheric Administration, under which a multiyear 

 program responding to needs of petroleum devel- 

 opment of the Alaska continental shelf is managed 

 by the Outer Continental Shelf Environmental 

 Assessment Program office. Support was also 

 provided by the Marine Mammal Commission and 

 the Alaska Department of Fish and Game. I 

 am grateful to R. Aulabaugh, D. Calkins, D. 

 McAllister, and K. Schneider for field assistance. 

 Thanks are due to D. Calkins, F. Fay, K. Frost, 

 L. Lowry, D. McKnight, and K. Schneider who 

 reviewed drafts of this paper. 



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KENNETH W. Pitcher 



Alaska Department of Fish and Game 

 333 Raspberry Road 

 Anchorage, AK 99502 



PRODUCTION AND GROWTH OF SUBYEARLING 



COHO SALMON, ONCORHYSCHUS KISLTCH, 



CHINOOK SALMON, OSCORHYSCHUS 



TSHAVC^TSCHA, AND STEELHEAD, 



SALMO GAIRDNERI, IN ORWELL BROOK, 



TRIBUTARY OF SALMON RIVER, NEW YORK 



Decline of lake trout, Salvelinus namaycush, and 

 burbot. Lota lota, populations in the Great Lakes 

 from 1930 to 1950 created a void of a large offshore 

 piscivore in these waters. Smith (1968) attributed 

 the decline to overexploitation by the commerical 

 fishery and predation by the sea lamprey, Pet- 

 romyzon marinus. The decline was followed by 

 proliferation of the alewife, Alosa pseudoharen- 

 gus, in Lakes Ontario, Huron, and Michigan 



fishery BULLETIN: VOL. 78, NO. 2, 1980. 



549 



