HAROSCRaBBLE 



Figure I. — Naknek River system, Alaska, showing the five main-stem lake basins 

 (Coville and Grosvenor Lakes, Iliuk Arm, South Bay. and West End) and the three ex- 

 ternal lake basins (North Arm, Northwest Basin, and Brooks Lake). 



Table I. — Total surface area and percentage of each 

 major basin of the Naknek River system shallower 

 than 5 m. 



'The total surface area of the external basins composes 

 31.1% of the total surface area of all of the lakes. 



<5 m deep ranges from about SS^c in Coville Lake to 

 about 1% in Brooks Lake. 



Sockeye salmon spawn in tributaries of each lake, on 

 some beaches, and in Naknek River; but the amount of 

 spawning grounds and the numbers of spawners are not 

 proportional to the size of the lakes (Table 2). 



ABUNDANCE OF JUVENILE SOCKEYE 

 SALMON AND ASSOCIATED SPECIES 



The apparent abundance of juvenile sockeye salmon 

 and associated species in the Naknek system from 1961 

 to 1964 has been reported in detail (Ellis 1974). Five 

 species of fish predominated — sockeye salmon; three- 

 spine stickleback, Gasterosteus aculeatus; ninespine 

 stickleback, Pungitius pungitius; pygmy whitefish, Pro- 

 sopium coulteri; and pond smelt, Hypomesus olidus. 



Table 2. — Distribution of spawning grounds of sockeye salmon and reported escapements of adult 

 spawners in basins of the Naknek system. 



'From Ellis (1974) except North Arm and Northwest Basin. 



•About 300.000 fish were observed in North Arm in 1969. (R. D. Dewey, Northwest & Alaska Fisheries 

 Center Auke Bay Fisheries Laboratory, Natl. Mar. Fish. Serv., NOAA, P.O. Box 155, Auke Bay, AK 

 99821. pers. commun. June 1975.) 



