Figure 26.- -Preparation for dive with use of SCUBA gear to observe behavior of fish in Brooks Lake, 1957. 



Depth of dive extended to 30 feet. Plankton 

 was very evident. The experimental gill nets 

 were fishing properly but no fish of any kind 

 were seen in or near the nets. 



Dive 3 — Dive was begun at station II over 

 120 feet of water; 150 adult sockeye salmon 

 wereobserved swimming parallel to the shore. 



A description of a second series of dives 

 made on August 30 under the same conditions 

 as on August 3 follows: 



Dives 1 and 2 — Each dive was of 15 

 minute's duration, between 2 and 3 p.m., on 

 the edge of the shelf (where shallow littoral 



zone ends) down to 45 feet. The purpose of the 

 dives was to determine whether sockeye sal- 

 mon fry were inhabiting the dense vegetation 

 blanketing the bottom. The only live fish ob- 

 served were one nearly dead blackfish and one 

 adult male sockeye salmon at a depth of 30 

 feet. The bottom was very soft, and a cloud of 

 sediment was stirred up with each step. Aquatic 

 plants (predominantly Myriophyllum) formed a 

 thick mat on the bottom. Three dead sculpins 

 were seen as were large thin- shelled snails. 



This very limited diving indicated that 



SCUBA may be useful as an observation 



method at Brooks Lake, and an expanded 



SCUBA program will be undertaken in the 

 future. 



42 



