122 True Fishes 



TUNAS, KING MACKEREL, CERO 

 SPANISH MACKEREL 



I. Base of first dorsal fin shorter than head 

 Page 123, figs. A, B 



la. Pectoral fin reaches to at least the origin of second 

 dorsal fin 

 Page 123, fig. A 



See Blackfin Tuna, p. 347. 



lb. Pectoral fin reaches to at most the rear portion of 

 first dorsal fin 

 Page 123, fig. B 



See Bluefin Tuna, p. 346. 



II. Base of first dorsal fin longer than head 

 Page 123, figs. C-E 



Ila. Lateral line dips sharply under second dorsal fin 

 Page 123, fig. C 



See King Mackerel, p. 349. 



lib. Lateral line descends gradually under second 

 dorsal fin 

 Page 123, figs. D, E 



1. Origin of pelvic fins below origin of first dorsal 

 fin; side with one or two longitudinal dark 

 stripes 



Page 123, fig. D 



See Cero, p. 349. 



2. Origin of pelvic fins behind origin of first 

 dorsal fin; no longitudinal dark stripes on sides 

 Page 123, fig. E 



See Spanish Mackerel, p. 348. 



