20 Commercial Shark Fishing in the Caribbean Area 



B. Six gill openings and 1 dorsal fin. 



Six-Gilled Shark, Hexanchus griseus, 

 Figure 31. 



C. Five gill openings and 2 dorsal fins, Figures 32 



through 51. 



1. Ordinary head shape (that is, not widely ex- 

 panded sidewise at eyes). Figures 32 through 

 47. 



a. Mouth at tip of snout. 



Whale Shark, Rhincodon typus, Figure 32. 

 Also conspicuous white or pale yellow 

 spots and several ridges lengthwise along 

 sides. 



b. Conspicuous barbel reaching from edge of 

 each nostril to mouth. 



Nurse Shark, Ginglymostoma cirratum, 

 Figure 33. 



c. All five gill openings located in front of the 

 pectoral fins, at least at their lower ends. 



Sand Shark, Carcharias taurus, Figure 34. 

 Lower lobe of its caudal fin only about 1/3 

 long as upper. 



Second dorsal fin and anal fin about as 

 large as first dorsal. 



Mako, Isurus oxyrhincus, Figure 35. 



Lower lobe of its caudal considerably more 



than 1/2 as long as upper. 



Second dorsal and anal fins much smaller 



than first dorsal. 



Teeth slender with smooth edges. 



Man-Eater, Carcharodon carcharias, 

 Figure 36. 



Caudal, dorsal and anal fins same as in 

 Mako. Upper teeth, however, broadly tri- 

 angular with serrate edges. 

 Lower teeth narrowly triangular with ser- 

 rate edges. 



