FISHERY BULLETIN: VOL. 75, NO. 4 



TABLE 1. — The sample of eastern spinner dolphins used in the life history analysis, by year and month. 



'In these years, adults were selected (except in Oct. 1972). Fetuses were not collected in 1968. 

 2 No samples in September. 



FIGURE 2.— Length-frequency dis- 

 tribution, by 5-cm increments, of col- 

 lected male eastern spinner dolphins by 

 year and month. Shaded squares are 

 fetuses. Hatched squares are small 

 fetuses of unknown sex (plotted with the 

 males). Sample sizes in parentheses. 



NOV I97I (36) 



- ,- a , n C-^ 



APR I968 (52) 



-, , r-H 



JAN I970 (2) 



JUL I970 (2) 



JAN I97I (2) 



FEB I97I (22) 



r\ 



DEC I97I (7) 



JAN I972 (9) 



r^ln 



-^ 



MAR 1972 (10) 



l-H r-n-H 



APR 1972 (28) 



P^L 



P 



5- 



— 



JAN 1974 (100) 



MAR 1974 (28) 



1974 (I) 

 P- 



NOV 



-M 



H- rLj V1 



-— i — —— l n — 



I (41) J 



1974 (3) 



rs 



n p— i r-p 



a 



JAN 1975 (173) 



H 



FEB 1975 (73) 



00 125 150 175 200 



LENGTH (cm) 



MAY 



-P =■ 



■^1 . 



K 



JUL 1975 (18) 



AUG 1975 (12) 



P — ■=>-, 1 



OCT 1975 (18) 



-F 3 - 



nrv^ 



NOV 1975 (13) 



_a '-' 



100 125 150 



P— n-n 



Laboratory Procedures 



Most laboratory procedures were the same as 

 reported for the earlier study of the growth and 

 reproduction of the spotted dolphin (Perrin et al. 



728 



1976). The techniques used in sectioning and read- 

 ing, however, differed somewhat. Some of the ap- 

 proximately 2,500 teeth prepared (includes recuts, 

 multiple specimens, etc.) were sectioned with mul- 

 tiple cuts, using a high-speed diamond saw 



