Table 1.— Breakdown of percent catch to temperatures (°F-°C) 

 observed from Kolmogorov-Smirnov graphs. 



Table 2.— Mean temperatures for large catches. 



Catch 



Period 



17 Weeks 



Barracuda 

 block 860 



1972 



1973 



1974 



x 



Yellowtail 

 block 916 



1972 



1973 



1974 



x 



Bonito 

 block 860 



1972 



1973 



1974 



x 



31 Weeks 



Barracuda 

 block 860 



1972 



1973 



1974 



x 



Yellowtail 

 block 916 



1972 



1973 



1974 



x 



Bonito 

 block 860 



1972 



1973 



1974 



20% 



505 



80% 



64.5°F 67.0°F 69.0°F 



63.5 66.0 67.0 



63.0 64.5 66.5 



63.72(17.62) 65.82(18.82) 67.52(19.72) 



62.0 65.0 68.0 



62.0 62.5 64.5 



61.5 63.0 68.0 



61.82(16.52) 63.52(17.52) 66.82(19.32) 



66.0 67.0 69.0 



61.0 65.0 67.0 



62.5 63.5 73.0 



63.22(17.32) 65.22(18.42) 69.72(20.92) 



64.0 67.0 69.0 



64.0 66.0 67.5 



63.0 64.5 69.0 



63.72(17.62) 65.82(18.82) 68.52(20.32) 



62.0 



62.0 

 62.5 

 62.2 2(16.8 2) 



65.0 

 63.0 

 66.0 

 64.7 £(18.22:) 



68.5 

 66.0 

 69.0 

 67.82(19.92) 



64.5 66.5 69.0 



63.5 65.5 67.0 



63.5 66.5 70.0 



63.82(17.72) 66.22(19.02) 68.62(20.42) 









Calculated 



Mean temperature for 



Species- 



Catch 



Mean catch 



large catch 





large catches I yr 



Period 



lyr 



lwk 



lwk 





(°F-°C) 



Barracuda 













block 860 













1972 



3.245 



107.7 



167.5 



67.5' 



F l 



1973 



13,303 



429.1 



686.6 



66.1 



> 67.1°F(19.5°C) 



1974 



13,109 



422.9 



676.6 



67.8 



J 



Yellowtail 













block 916 













1972 



21,441 



691.6 



1.106.6 



65.2 



1 



1973 



142.556 



4.598.6 



7,357.8 



64.1 



> 65.3°F(18.5°C) 



1974 



63,470 



2,047.4 



3,275.8 



66.8 



J 



Bonito 













block 860 













1972 



51,148 



1,899.4 



3.031.0 



669 



I 



1973 



104,790 



3.380.3 



5,408.5 



66.4 



> 67.4°F(19.6°C) 



1974 



54,672 



1.763.6 



2,821.8 



68.9 



i66.6° 



/ 



F(19.2°C) 



ACKNOWLEDGMENTS 



I am grateful for the cooperation of the U.S. Coast Guard, Com- 

 manding Officer Western Area, and the personnel of the Port 

 Angeles, San Francisco, and San Diego Air Stations who made the 

 first phase of this study possible. I wish to thank Gerry Talbot, Sven 

 Johnson, and other staff members of the Tiburon Marine Laboratory 

 who participated in the U.S.C.G. surveys, and Parke Young of the 

 CF&G. The efforts of staff members of the La Jolla Laboratory who 

 assisted in the San Diego area aerial survey are acknowledged as well 

 as the cooperation of the Statistical Group of the CF&G. Jim 

 Zweifel s invaluable assistance is greatly appreciated in development 

 of the statistical procedures and rationale used in the analysis of Part 

 U, along with Mike Kicpera's efforts in programming, reviewing, 

 and testing the calculations. 



Again there is strong evidence that the lowest temperature range. 

 12.7° to 15.6 °C (55° to 60 °F). is the only area where catch rates are 

 lower than expected. 



While evidence of correlations between angler success and ocean 

 temperature for species of yellowtail and Pacific barracuda have been 

 reported by Radovich (1975), it is difficult to interpret data from 

 investigations where sampling may be selective, especially if the 

 selection is temperature related. The obvious relationship of catch 

 and temperature may simply reflect increased effort, or may be due 

 primarily to sampling above and below the temperature range of the 

 species. The data presented in this report suggest the latter, and there 

 is little evidence to indicate a preferred temperature within the range 

 15.6°to21.rC(60°to70°F). 



Again, it should be stressed that fishery data are not optimum for 

 examining this hypothesis because of the serious confounding of 

 cause and effect. Simultaneous observations of the spatial distribu- 

 tion of the species, environmental measurements over the extent of 

 distribution, and the changes that occur over time, must all be consid- 

 ered before the true relationship of these pelagic species to the envi- 

 ronmental factor of sea surface temperature can be established. 



LITERATURE CITED 



HUBBS. C. L. and L. P. SCHULTZ. 



1929. The northward occurrence of southern forms of marine life along the 

 Pacific coast in 1926. Calif. Fish Game 15:234-241. 

 RADOVICH. J 



1961. Relationships of some marine organisms of the northeast Pacific to 

 water temperatures, particularly during 1957 through 1959. Calif. Dep. Fish 

 Game. Fish. Bull. 112. 62 p. 



1975. Water temperature and fish distribution: an epilogue to the warm water 

 years. Symposium on climatic change in the southern northeastern Pacific. 

 Proc. 13th Pac. Sci. Congr.. Aug. 18-30, 1975. Univ. B.C., Vancouver, 22 p. 

 ROYAL. L A., and J. P. TULLY. 



1961. Relationship of variable oceanographic factors to migration and sur- 

 vival of Fraser River salmon. Calif. Coop. Oceanic Fish. Invest. Rep. 

 8:65-68. 

 SQUIRE. J. L..JR 



1969. Progress on airborne infrared sea surface temperature surveys of the 

 eastern Pacific continental shelf. In Marine Technology Society Transactions 

 - Marine Temperature Measurements Symposium. June 1969. p. 209-226. 



1971. Measurements of sea surface temperature on the eastern Pacific conti- 

 nental shelf using airborne infrared radiometry: August 1963-July 1968. U.S. 

 Coast Guard Oceanogr. Rep. 47(CG 373-47J, 229 p. 



1978. Sea surface temperature distributions obtained off San Diego. Califor- 

 nia, using an airborne infrared radiometer. US Dep. Commer. NOAA Tech. 

 Rep. NMFS SSRF-720. 30 p. 



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