Left. In the Shumagin Islands, 

 Alaska, an exploratory opera- 

 tion For shrimp produced excellent 

 results. This haul was made with 

 a 40-foot "Gulf of Mexico" 

 shrimp trawl. Towing time for 

 20-30 minutes produced a catch 

 of 3,300 pounds. The operation 

 was conducted aboard the Bu- 

 reau's charter vessel Tordenskjold. 



■■•./ 



P~" 



Right. Commercially productive 

 trawling grounds were located by 

 the John N. Cobb in mid-1960. 

 Fishermen harvested 300,000 pounds 

 from the petrale sole grounds during 

 the first 1 days of fishing. This more 

 than compensated for the cost of the 

 Cobb's cruise. This area was pre- 

 viously considered unfishable be- 

 cause of poorly defined rough bottom. 



Pilot house indicotor meter, 

 controls and lomp 



Left. Electrical trawl cables have been used 

 aboard the John N. Cobb since 1957. The 

 equipment was first used for depth telemetering. 

 Since 1959, the use has been extended to measure 

 temperature, indicate bottom contact, and supply 

 data on catches. These continuing experiments 

 assist private enterprise to build a new phase of the 

 commercial fishing industry. 



Electrical trawl coble 



Cctch-lood indicator 



Deptti^Temperoture sensing unit i> 



Bottom contact switcti 



10 



