FISHES 



143 



man-killers, the Sharks becoming specially dangerous 

 at night. Shark flesh, after the oil has been extracted, is 

 used for food, the spinal columns are converted into 

 walking-sticks, and the waste parts employed as fertilisers. 





Saw Fish 



There is a big export trade of dried fins for soup to 

 China, and the skin is treated to provide many varieties 

 of leather. 



Nearly allied to the Sharks are the Saw Fishes (Ptistidae), 

 which reach an immense size, with saws projecting from 

 the snout for six feet or more. Saw Fish, like many true 

 Sharks, are born alive, the infant Saws being encased 



