the Gilbert's fall cruise (23). On the western 

 leg along 165°W. longitude, under better 

 weather conditions, dolphin were taken as far 

 north as 41°04'N. latitude. Catches were made 

 on both troll and longline gear, often at the same 

 positions. 



SUMMARY 



1. Five cruises, 4 primarily fishing and 1 

 primarily oceanographic, were made during 

 the spring, summer, and fall of 1955 to 

 determine the distribution and abundance of 

 albacore tuna to the north and northeast of 

 the Hawaiijin Islands. 



2. Albacore were scarce in the above areas 

 during the late spring but were relatively 

 abundant during the late summer. The 

 summer distribution was probably discon- 

 tinuous from east to west, with concentra- 

 tions in the eastern and central North Pacific 

 sectors and a lack of fish between them. 

 During the fall this intervening area con- 

 tained albacore in relative abundance, 

 suggesting that the discontinuity was either 

 a transient condition or had diminished 

 somewhat with the change in season. 



LITERATURE CITED 



ANONYMOUS 



1955. Albacore tuna scarce in easternNorth 

 Pacific in May reports N. B. Scofield 

 (cruise 55-S-3). U. S. Fish and Wild- 

 life Service, Comm. Fish. Rev. 17(9): 

 44-46. 



CALIFORNIA DEPARTMENT OF FISH AND 

 GAME. MARINE FISHERIES BRANCH 



1956. NORPAC. Albacore exploration, M/V 

 PaolinaT. -Cruise No. 5508P, Aug. 3, 

 1955-Aug. 26, 1955: 1-15. Terminal 

 Island, Calif. (Mimeog. narrative 

 report) 



CLEMENS, HAROLD B. 



1955. Catch localities for Pacific albacore 

 (Thunnus germo) landed in California, 

 1951 through 1953. Calif. Dept. of 

 Fish and Game, Fish. Bull. 100: 5-28. 



MANN, HERBERT J. 



1955. Construction details of improved tuna 

 long-line gear used by Pacific Oceanic 

 Fishery Investigations. U. S. Fish 

 and Wildlife Service, Comm. Fish. 

 Rev. 17(12): 1-10. 



3. Catches of surface-swimming and possibly 

 those of deep-swimming albacore were 

 associated with the Polar Front, a transi- 

 tion zone between Central Pacific and Sub- 

 arctic waters. Surface catches were also 

 associated with a seasonal latitudinal change 

 in surface temperature, particularly about 

 the isotherms 55° to 65°F. 



4. Comparison of length frequencies of surface- 

 caught albacore taken in the central and 

 eastern sectors of the North Pacific showed 

 that the same size ranges were sampled on 

 either side of the east-west discontinuity 

 noted above. Size ranges of surface-caught 

 and subsurface-caught albacore were similar 

 in the eastern sector, but the latter were, 

 for the most part, larger in the central 

 sector. 



5. A latitudinal shift in occurrence, as noted 

 for the albacore, was also displayed by 

 other fishes. 



McGARY, JAMES W. , E. C. JONES, and 



T. S. AUSTIN 



1956. Mid-Pacific oceanography Part IX, 

 Operation NORPAC. U. S. Fish and 

 Wildlife Service, Spec. Sci. Rept. -- 

 Fish. 168: 1-127. 



, and E. D. STROUP 



1956. Mid-Pacific oceanography Part VIII, 

 middle latitude waters, January- 

 March 1954. U. S. Fish and Wildlife 

 Service, Spec. Sci. Rept. --Fish. 180: 

 1-173, 



NOMURA, TOSHIZO 



1956. A consideration of the high-seas tuna 

 fishery based mainly on studies of 

 landings at Misaki and four other ports 

 (August 1955). Published monthly by 

 Kanagawa Fisheries Experiment Station 

 26, pp. 1-14. 



POWELL, DONALD E., D. L. ALVERSON, and 



R. LIVINGSTONE, JR. 



1952. North Pacific albacore tuna explora- 

 tion - 1950. U. S. Fish and Wildlife 

 Service, Fish. Leaflet 402: 1-56. 



