FISHERY BULLETIN: VOL. 82. NO. 4 



usual variation for a species is 3 or 4 spines. 

 Acanthocybium has the most dorsal spines, 23-27. 

 Of the species of Scomberomorus , munroi (20-22) 

 and niphonius (19-21) both usually have 20 or 21 

 dorsal spines, more than the other 16 species in 

 the genus, and this is one reason that S. munroi 

 was not described until recently (Collette and 

 Russo 1980). Four species of Scomberomorus 

 have low counts: cavalla 12-18, usually 15; semi- 

 fasciatus 13-15; koreanus 14-17, usually 15; and 

 plurilineatus 15-17. Grammatorcynus has even 

 fewer dorsal spines, 11-13, usually 12. Dorsal 

 spine counts are roughly correlated with verte- 

 bral number (Table 8). Acanthocybium has the 

 highest counts of precaudal and total vertebrae; 

 iS. munroi and S. niphonius have the highest 

 precaudal vertebral counts, but not highest total 

 vertebral number; S. cavalla has the lowest pre- 

 caudal and total counts in the genus; and Gram- 

 matorcynus has the fewest precaudal, caudal, and 

 total vertebrae. 



The range in number of second dorsal fin rays 

 is 10-25 in the three genera (Table 10). The usual 

 variation for a species is 4 or 5 rays. Five species 

 of Scomberomorus have high counts: multiradia- 

 tus 21-25, usually 23 or 24; koreanus 20-24, usu- 

 ally 22 or 23; guttatus 18-24, usually 20-22; semi- 

 fasciatus 19-22, usually 20; and plurilineatus 

 19-21, usually 20. The lowest counts in Scomber- 

 omorus are in sinensis, 15-17 rays. Acanthocyb- 

 ium (12-16) and Grammatorcynus (10-12, usually 

 11) have even fewer second dorsal fin rays. Verte- 

 bral counts (caudal and total) are highest in S. 

 multiradiatus and lowest in S. sinensis. Gram- 

 matorcynus has the fewest vertebrae. 



Dorsal finlets number 6-11 in the three genera 



(Table 10). The usual variation for a species is 3 

 or 4 finlets. The highest counts are in S. commer- 

 son and S. queenslandicus , both usually 9 or 10 

 finlets. The lowest counts, 6 or 7, are in S. 

 sinensis and Grammatorcynus. The next fewest 

 dorsal finlets, 7 or 8, rarely 9, are found in S. 

 multiradiatus. The low number of finlets and 

 high number of second dorsal fin rays in this 

 species may indicate an extension of the fin at the 

 expense of the number of finlets. 



Anal fin rays (Table 11) show a similar trend to 

 that of dorsal fin rays. The range in the three 

 genera is 11-29; the usual variation for a species 

 is 4-6 rays. Four of the five species of Scomber- 

 omorus with high counts of second dorsal fin rays 

 also have high counts of anal fin rays: multira- 

 diatus 25-29; koreanus 20-24, usually 22 or 23; 

 guttatus 19-23, usually 20-22; and semifasciatus 

 19-22, usually 21 or 22. No species of Scomber- 

 omorus stands out with very low counts but six 

 species usually have 17-19 anal fin rays, lower 

 than the other species of the genus: brasiliensis, 

 cavalla, commerson, munroi, niphonius, and si- 

 nensis. Acanthocybium (11-14) and Grammator- 

 cynus (11-13, usually 12) again have the fewest 

 rays in this fin. 



Anal finlets range 5-12 in the three genera 

 (Table 11) with the usual variation for a species 

 being 4 finlets. The most finlets are found in S. 

 queenslandicus (9-11, usually 10) followed by 

 commerson and lineolatus usually having 9 or 10 

 finlets, similar to the situation with dorsal fin- 

 lets. The lowest counts, usually 6 finlets, are 

 found in S. multiradiatus, S. sinensis, and Gram- 

 matorcynus „ just as with dorsal finlets. Again the 

 anal fin of S. multiradiatus appears to have 



TABLE 10. — Number of second dorsal fin rays and dorsal finlets in Acanthocybium. Grammatorcynus. and the species of Scomberomorus. 



Species 



Dorsal rays 



Finlets 



10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 



N 



9 10 11 



N 



S. brasiliensis 

 S. cavalla 

 S. commerson 

 S. concolor 

 S. guttatus 

 S. koreanus 

 S lineolatus 

 S. maculatus 

 S. multiradiatus 

 S. munroi 

 S. niphonius 

 S. plurilineatus 

 S. queenslandicus 

 S. regalis 

 S. semifasciatus 

 S. sierra 

 S. sinensis 

 S tntor 



Acanthocybium 

 Grammatorcynus 



1 

 37 



21 



11 52 48 13 



12 25 

 21 61 



4 9 

 5 



3 

 12 12 



10 

 2 12 



2 29 



9 1 



6 25 

 2 



19 



67 



10 



3 



11 2 

 19 25 



8 

 12 



11 

 28 



41 



1 1 

 16 



5 



3 

 1 

 6 

 10 

 5 

 6 

 6 



1 

 2 



24 

 1 





 7 



40 24 



4 8 



22 8 



18 



7 

 13 



4 10 8 



125 

 60 



162 

 31 



104 

 27 

 29 

 56 

 27 

 15 

 38 

 36 

 31 

 47 

 32 

 78 

 14 

 41 

 35 

 43 



17.5 

 17.0 



174 

 18 5 

 21 

 22.3 

 17.6 

 18.6 

 23.1 

 18.1 

 17.0 

 20.1 

 18.0 

 17.8 

 20.2 

 17.7 

 15.8 

 17.1 

 13.3 

 10.9 



29 89 12 



15 35 6 



12 76 72 



7 21 1 



6 52 43 4 



7 17 4 



2 7 18 2 



2 29 25 



15 10 2 



11 4 



9 22 7 



12 20 3 



1 



40 



39 



9 19 



43 33 



33 7 



16 11 



12 17 

 6 



130 

 57 



164 

 30 



105 

 28 

 29 

 56 

 27 

 15 

 38 

 35 

 31 

 47 

 31 

 79 

 14 

 41 

 36 

 45 



8.9 

 8.8 

 9.4 

 7.7 

 8.4 

 7.9 

 8.7 

 84 

 7.5 

 9.3 

 7.9 

 8.7 

 9.7 

 8.1 

 8.8 

 8.4 

 6.4 

 8.1 

 8.3 

 6.1 



602 



