Table 1. — Gill rakers in Arctic char and Dolly Varden from various 

 parts of Katmai National Monument sund in Dolly Varden from Karluk 

 and Eraser Lakes on Kodiak Island 



Species 



Fish in sample 



Gill rakers, lower half of 

 first left gill arch 



Range 



Mean 



Salvelinus alpinus 

 Brooks Lake—' 

 Idavain Lake— 



Idavain Lake 

 Salvelinus malma 

 Southern form 



Dakavak Lake 



Devils Cove Lake 



Fraser Lake—' 



Kaguyeik Crater Lake 



Karluk Lake^/ 



Kuliak Bay Lake 

 Northern form 



Brooks Lake— 



Number 



1 



4 



20 



Number 



14 

 14-16 

 13-16 



Number 



W.7 

 14.2 



15 

 12 

 38 

 9 

 33 

 18 



9-11 

 10-12 



8-12 

 10-11 



8-12 



9-12 



10.2 



11.1 



10 



10.8 



11 



10.4 



(tributaries) 



20 



11-14 



12.6 



1/ 



Data from McPhail (1961) , 



Lake Arctic char (table 1). Kaguyak Crater 

 Lake now has no outlet, although a low point 

 in the northeast rim of the crater suggests 

 that a streann may have flowed at an earlier 

 date when water levels in the crater were 

 higher (see Cahalane, 1959, plate 2, fig. 1). 

 Sequential beach ridges attest to the former 

 occurrence of higher water levels inside the 

 crater. Dolly Varden live in the surrounding 

 Big River drainage, and apparently dispersed 

 into this unusual habitat. 



Lake trout, Salvelinus namaycush (Wal- 



baunn) .- - Lake trout were collected only in the 

 Naknek system. We collected thenn in almost 

 all areas of Naknek, Coville, Grosvenor, and 

 Brooks Lakes but not in any of the smaller 

 lakes within the monument, although they 



occur in Hammersly and Murray Lakes. Al- 

 though the species is found primarily inlakes, 

 occasionally they are seen in the connecting 

 rivers between lakes, such as Brooks and 

 Coville Rivers. Grosvenor Lake has a limited 

 sport fishery for lake trout just below the out- 

 let of Coville River, where a concentration of 

 fish remains at least from ice breakup in the 

 spring until mid-September. This concentra- 

 tion of lake trout is undoubtedly related to the 

 food that passes down the inlet stream. Lake 

 trout have been observed at Colville River 

 preying on migrating juvenile sockeye salmon. 

 They also prey heavily on sticklebacks and 

 pond smelt and occasionally on small rodents. 

 Greenbank (see footnote 4) presented data on 

 the average size of various age groups of lake 

 trout from the Naknek system, and Lindsey 



11 



