FISHERY BULLETIN: VOL, 77. NO, 3 



Table 7. — Numbers of gill rakers, by areas, for the two Scomberesoz saurus subspecies. 



'Counts by Parin (1968a 280, fig 3) for specimens 75 mm and longer are included mtfie above counts tor Northwest Atlantic (5 specimens) and Mediterranean (5 

 specimens) 



'Data from Peru. Chile, Central Pacrfic, and Australia-New Zealand are combined since counts from each area are very similar, the means ranging from 42 87 to 

 43 08 gill rakers 



1 ^ 



2 ^^H 



3*7 ^ 



3 • 



4 _^-_-_- 



6 -^^^ 



7 



i« 35 3& 3r 38 39 40 41 42 43 44 45 46 47 4Q 49 50 5l 



GILL RAKERS 



Figure 6. — Graphed variation in numbers of gill rakers o{ Scomberesox saurus saurus and of S. s. scombroides. by area. Scomberesox s. 

 saurus: 1— Northwest Atlantic, N = 69; 2 — Northeast Atlantic and Mediterranean, A^ = 45; 1 + 2 — total for Northern Hemisphere, N = 

 114. Scomberesox s. scombroides: 3 + 7— total for Southern Hemisphere, N - 296; 3— Southwest-central South Atlantic, N = 35; 

 4— Atlantic near South Africa, N = 46; 5— South Pacific (new data), iV = 147; 6— South Pacific (Parin 1968a), N = 36; 7— Indian 

 Ocean, Af = 32 1 26 from Parin 1 1968a), 6 new data). In each sample the baseline shows the total range in variation, and the short vertical 

 line the mean of the sample; open (white) bars del ineate 1 SDon each side of the mean, and the solid (black) bars 2 SE of the mean on 

 each side of the mean. 



The difference between means for gill rakers 

 (39.19 vs. 44.11) of the total populations of S. s. 

 saurus and S. s. scombroides (Table 7; Figure 6, 

 lines 1+2 and 3+7) appears to be highly sig- 



nificant, the probable odds (untested) being bil- 

 lions to one against the two areas comprising a 

 single, homogeneous population. Despite a large 

 overlap in numbers of rakers, the calculated CD. 



540 



