59 



as the air is expelled in freezing, and it must be well 

 aerated before it is capable of supporting life. The one 

 advantage that it offers is that it will hold the air longer 

 in suspension when once introduced, and will retard de- 

 composition and consequent generation of noxious gases, 

 but a more rapid and constant means of aeration will prob- 

 ably produce better results. 



Recent experiments made by the U. S. Fish Commission 

 show that trout and other lish which require a very large 

 amount of oxygen will live comfortably at quite high tem- 

 perature— 70^ to 80^ F.— if the water is constantly charged 

 with air by artificial means, demonstrating that it is not 

 strictly the high temperature that affects them unfavor- 

 ably, but that the water when it reaches a certain elevation 

 of temperature does not contain enough air in suspension 

 to supply them with the amount of oxygen they require. 



In the transportation of fishes for the live fish exhibit at 

 the World's Columbian Exposition, it is proposed to adapt 

 a car to the purpose, on which will be constructed a tank 

 holding if possible 3,000 gallons of water, the inner sides 

 of which will be so protected with soft material that inju- 

 ries to the hsh from striking against them will be reduced 

 to a minimum. There will also be an efficient system of 

 aeration. 



It has been found through experiments made by the 

 U. S. Fish Commission with salt-water fishes, that as the 

 area of environment is increased the tendency to fear and 

 nervous excitement, and consequent liability to injury, are 

 reduced, and fishes which in small aquarium tanks had be- 

 come diseased, and sometimes apparently at the point of 

 death, on being placed in the reservoir were restored to 

 health. 



Large fishes in transportation are generally very much 

 bruised and torn, and in fresh water they are soon infested 

 with fungus. The handling of them with nets in trans- 

 ferring them to medicated baths, to destroy the fungus 



