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Fishery Bulletin 91(3), 1993 



Fig. 1). WSA b was measured as the sum of surface 

 areas of right circular cones. Conic surfaces were cal- 

 culated from measurements of body circumference at 

 five locations and distances from tip of rostrum to each 

 circumference and to fluke notch (Fig. 1). 



WSA lp , WSA,, and WSA,, were estimated by tracing 

 the perimeter of each fin onto white paper, measuring 

 with a digitizer the surface enclosed, correcting for 

 curvature, and multiplying by 2. Both flukes were 

 traced as a unit. Each dorsal fin and flipper was traced 

 separately. 



The correction for curvature along fin surfaces was 

 derived from one small (132 cm TL) and one large 

 (193cm TL) dolphin. Flippers, flukes, and dorsal fin 



from each specimen were sliced laterally into 4 or 5 

 sections. The cross-section of each piece was then 

 xeroxed onto white paper. Distances straight across 

 and around the perimeter of each cross-section were 

 then measured twice for each cross-sectioned piece of 

 fin. There were no significant differences between fins 

 or sizes of dolphin in the ratio of curved to flat mea- 

 surements so a single correction was used for all fins. 

 The curvature correction was an increase of 6% over 

 the estimated flat area of each fin (3% per side; SE = 

 0.4; n = 23 sections). 



MCD lp , MCD, h and MCD P were measured to the near- 

 est millimeter by using calipers at the thickest part of 

 each fin at the mid-point of the characteristic length. 



