266 



U. S. BUREAU OF FISHERIES 



has kept certain harbor and West Indian seals 5 3'ears and a Cali- 

 fornia sea lion 19 years, but in each case these were unusually active 

 individuals, habitualy swimminir many hours a day. The aquarium 

 in Washington, D. C, kept a pair of fur seals nine years. 



Manatees are sluggish in habit and do not often avail themselves 

 of the space afi'orded for exercise. Success in keeping them depends 

 chiefly upon suitable water temperature and pure air. The aquarium 

 has kept the brackish-water manatee of Florida 17 months and the 

 fresh-water manatee of the Amazon over two vears. 



