E 



O MS- 



X 



u 



P 23S 



O 



5 22S- 



1 



205 



1 



2 IS 



1 



22S 



1 



24S 



-I — 

 275 



1 



305 



2SS 26S 



CURVED FORK LENGTH (Cm) 



Figure 3. — Functional (GM) regression of straight fork length on curved fork length for 606 western 

 Atlantic bluefin tuna 1974-77. (Number offish indicated, star signifies number >9.) 



ference I found was SVe for a 130 cm bluefin tuna. 

 Again I used my range of values for dressed weight 

 since the range was not given by these authors. 



My functional (GM) regression estimates of 

 straight fork length from curved fork length agree 

 very closely over my entire size range with esti- 

 mates I obtained using the regression equation 

 given by Mather and Schuck (1960). The largest 

 difference I found, only 1%, occurred at the lower 

 end of my range of curved fork length values of 200 



Acknowledgments 



I thank Gary Sakagawa of the Southwest 

 Fisheries Center, National Marine Fisheries Ser- 

 vice (NMFS), NOAA; Emma Henderson of the 

 Northeast Fisheries Center, NMFS, NOAA; Fred- 

 erick Berry, Raymon Conser, Mark Farber, 

 Michael Parrack, William Richards, Luis Rivas, 

 James Tyler, and James Zuboy of the Southeast 

 Fisheries Center, NMFS, NOAA; and Arvind 

 Khilnani of Stanford University for their helpful 



comments on the manuscript. I also thank Tom 

 Chewning of the Southeast Fisheries Center for 

 computer programming assistance. 



Literature Cited 



BEAUCHAMP. J. J., AND J. S. OLSON, 



1973. Corrections for bias in regression estimates after 

 logarithmic transformation. Ecology 54:1403-1407. 



BUTLER, M. 



197 1 . Biological investigation on aspects of the life history 

 of the bluefin tuna 1970-1971 Newfoundland and Lab- 

 rador Tourist Development Office, St, Johns, 169 p. 

 COAN, A, L. 



1976. Length, weight and age conversion tables for Atlan- 

 tic tunas. Int. Comm. Conserv. Atl. Tunas, Collect. Vol. 

 Sci. Pap. 5 (SCRS-1975):64-66. 

 GIBBS, R. H., Jr., and B. B. COLLETTE. 



1967. Comparative anatomy and systematica of the tunas, 

 genus Thunnus. U.S. Fish Wildl. Serv., Fish. Bull. 

 66:65-130. 

 LENARZ, W. H. 



1974. Length-weight relations for five eastern tropical At- 

 lantic scombrids. Fish. Bull., U.S. 72:848-851. 



Mather, F. J., Ill, J. M, Mason, and A. C. Jones. 



1974. Distribution, fisheries and life history data relevant 



999 



