HatvaiianFishes 19 



The thresher shark is widely distributed and is found in all of the 

 temperate and tropical seas of the world. It is more abundant in warm 

 seas. It is reported to be fairly common in the waters about Japan and is 

 occasionally seen in Honolulu markets. 



THE GRAY SHARK FAMILY 



Also known as the Requin or Blue Shark Family 

 5 Family Galeorhinidae (Eulamiidae) 



The family of the gray sharks is the largest family of existing sharks 

 and is represented in Hawaiian waters by about ten species. They are 

 nearly all uniform in color and do not have spines on their tw© dorsal 

 fins. They also lack the groove which runs between the eye and the 

 nostrils in some sharks. The bodies of these fishes are long and their tails 

 are flattened. The snout is somewhat pointed and the mouth contains a 

 large number of teeth which are arranged like a brick pavement. 



The gray sharks are nearly all dwellers of the open sea where they 

 spend a roving, predatory life at the surface of the water. Some of the 

 members of the family are small and harmless while others are large and 

 voracious. 



These sharks are of some economic importance. Their skin is a val- 

 uable article of commerce called shagreen and is used for binding books, 

 sword handles, scabbards, etc. The flesh of these fishes is white and firm, 

 very tough, and has an unpleasant smell to westerners. It is eaten in both 

 the Philippine Islands and the Orient and is canned for food and made 

 into fertilizer. 



Blue Shark 



Also known as Tope, Toper, Whitehound, or Pennydog Shark 

 5-1 Galeorhinus galeus (Linne) 



The blue shark, which is of medium size, is a brown or dusky gray 

 above and lighter in color below. The teeth, which are alike in both jaws, 

 are set obliquely, are notched, and have fine saw edges. 



