122 



NORSE 



Fig. 1 The study areas in the east Pacific: (1) Northern Gulf of 

 California, Mexico; (2) Panama; and (3) Colombia; and the west 

 Atlantic: (4) Miami area and Florida keys; (5) Jamaica; (6)CuraQao; 

 and (7) Colombia. 



METHODS 



Distributions 



On Colombia's Pacific coast, I worked with Mario Estevez, a 

 biologist then a member of the Colombian Marine Fisheries 

 Development Project, using the Colombian government's shrimp 

 trawler Inderena to sample in the lower reaches of four large rivers, 

 Guafui, Timbiqui, Saija, and Naya, and on the adjacent continental 

 shelf. We planned four transects, each having seven trawls from as far 

 upriver as nets could be operated to the 20-fathom (37-m) contour 

 on the shelf (upriver, midriver, river mouth, and at 9, 18, 27, and 

 37 m), but two of the transects were only partially completed. To 

 assure sufficient depth for shrimp-trawl operation and to minimize 

 the effects of running tides on crab movements, we made all 

 estuarine trawls within 1 hr of high slack tide. We did shelf trawls 

 during daylight hours irrespective of tides. We trawled without 

 tickler chains at equal speeds for equal periods to cover equal areas 

 of bottom. At the midpoint of most trawls, we took surface 

 temperatures and water samples, but the water samples were lost 



