Table 2. --Five degree squares not fished by Japanese longlines, 1956-68, by quarter of 

 the year. Each square is identified by the coordinates of its southeast corner. 



Never fished* 



First quarter** Second quarter 

 not fished not fished 



Third quarter 

 not fished 



Fourth quarter 

 not fished 



40°N 



- 70°W 



35 °N- 



• - 75°W. 



40°N 



- 15 °W 



40°N 



- 10°W 



40°N 



- 65 °W 



40°N 



- 05 °W 



35 °N 



- 70°W. 



35 °N 



- 20°W 



35 °N 



- 75 °W 



40°N 



- 60°W 



40°N 



- 00° 



35 °N, 



. - 65 °W. 



35 °N 



- 15°W 



35°N 



- 45 °W 



40°N 



- 15 °W 



35 °N 



- 05 °W 



35 °N 



- 60°W. 



35 °N 



- 10°W 



30°N 



- 80°W 



40°N 



- 10°W 



30°N 



- 85 °W 



35 °N 



- 45°W. 



30°N 



- 15 °W 



30°N 



- 75 °W 



35 °N 



- 75 °W 



30°N 



- 10°W 



35 °N 



- 25 °W. 



25 °N 



- 80°W 



30°N 



- 30°W 



35 °N 



- 70°» 



30°N 



- 05 °W 



35 °N 



- 15°W. 



25 °N 



- 15 °W 



30°N 



- 15 °W 



35 °N 



- 15 °W 



25 °N 



- 10 °W 



35°N 



- 10°W. 



20°N 



- 25 °W 



25 °N 



- 15 °W 



35 °N 



- 10°W 



05 °N 



- 60°W 



30°N 



- 80°W. 



05 °N 



- 80°W 



20°N 



- 25 °W 



30°N 



- 80°W 



05 °S 



- 50°W 



30°N 



- 75°W. 



05 °N 



- 75 °W 



20°N 



- 15 °W 



30°N 



- 75°W 



05 °S 



- 45 °W 



25 °N 



- 80°W. 



05 °N 



- 05 °W 



10°N 



- 10°W 



30°N 



- 70°W 



25 °S 



- 45 °W 



25 °N 



- 30°W. 



20°S 



- 35 °W 



05 °N 



- 05 °W 



30°N 



- 65 °W 



40°S 



- 60°W 



25 °N 



- 20°W. 



20°S 



- 20°W 



05 °N 



- 00° 



30°N 



- 50°W 



40°S 



- 55 °W 



20°N 



- 80°W. 



20°S 



- 15 °W 



05 °N 



- 10°E 



30°N 



- 15 °W 



40°S 



- 25 °W 



20°N 



- 75°W. 



25 °S 



- 40°W 



25 °S 



- 30°W 



25 °N 



- 80°W 



40°S 



- 10°W 



20°N, 



- 45 °W. 



25 °S 



- 35 °W 



25 °S 



- 25 °W 



25 °N 



- 75 °W 



40°S 



- 05 °W 



20°N 



- 30°W. 



25 °S 



- 20°W 



25 °S 



- 20°W 



25°N 



- 65 °W 



40°S 



- 00° 



20°N 



- 25 °W. 



25 °S 



- 15 °W 



30°S 



- 30°W 



25 °N 



- 60°W 



40°S 



- 10°E 



15 °N 



- 90°W. 



25 °S 



- 10°W 



35 °S 



- 50°W 



25 °N 



- 55 °W 



40°S 



- 15 °E 



10°N 



- 10°W. 



25 °S 



- 05 °W 



40°S 



- 50°W 



25°N 



- 50°W 



The mean catch per unit of effort taken as 

 apparent abundance for a square for a quarter 

 was computed as the arithmetic mean of the 

 catch per unit of effort for each month in the 

 quarter for each year — possibly 39 values 

 had the square been fished in every month of 

 the quarter in all of the 13 years. The method 

 was selected over the alternative of dividing 



total catch by total effort because we desired 

 to weight each unit of time equally to elimi- 

 nate the possible biasing effects of large vari- 

 ations in fishing effort in different years. Over 

 70% of the fishing in the 13 years took place 

 in the 5 years 1962-66 (Table 1). 



Catch per unit of effort was estimated for 

 most unfished squares, and they were "filled" 



