MONTANA STATE FISH AND GAME COMMISSION 



33 



Pond Improvements 



The personnel of several of the hatcheries has carried out a number of 

 experiments with a view to lowering water temperatures and to break up the 

 sun's rays in the circular, outside ponds now proving so successful. A system 

 of spray jets has been devised which, when supplied with water at a pressure 

 of approximately 20 pounds to the square inch, reduces the temperature more 

 than seven degrees Fahrenheit, besides giving ample coverage over the surface 

 from the sun's rays and greatly aiding the available oxygen content of the 

 ponds. This allows a greater number of fish to be carried without over-crowding. 



ANTICIPATION— REALIZATION 



Dr. Howard Welch and Dr. J. R. Parker, tooth of Bozeman, liaving one of those 

 moments in the thrilling- waters of Hetoffen lake. 



