THIRTY-FIKST BIENNIAL REPORT 



87 



With the first reports of an outbreak of duck disease, Mr. Shaw will 

 be in the field to check on laboratory findings. A full report on the 

 investigation is being prepared. 



Before leaving in the fall of 1928, Dr. Henrj' Van Roekel completed 

 certain studies of the parasites of deer. Numerous post-mortem exam- 

 inations of diseased game birds, mammals and fish were made and 

 reports sent to those interested. Published articles have reported the 

 main findings. Of particular value also were a number of tests which 

 he conducted at the State Game Farm in order to prevent such dan- 

 gerous diseases as coccidiosis, tuberculosis and blackhead. As a result 

 of these studies he prepared a list of disease preventive measures to be 

 employed by game breeders. It is believed that the suggestions for 

 sanitation will aid in eliminating some of the troubles of the game 

 breeder. 



During a disease outbreak in one of the hatcheries, he developed a 

 new method of controlling skin parasites of trout. A severe outbreak 



Fig. 30. Deer lung infested with lung worms, Dictyolcaulis hadweni. Bronchioles 

 are filled with worms. (Katural size.) 



of furunculosis, that dangerous disease of hatchery trout, was success- 

 fully controlled. 



Dr. E. C. ORoke completed his investigations of a type of bird 

 malaria found in the valley quail. The quail fly, of the famih^ Hipopo- 

 hoscidae was shown to be a carrier of the causative agent, a blood para- 

 site, Haemoproteus lophortyx. In addition. Dr. O'Roke discovered a 

 dangerous, contagious disease in quail secured on private game farms. 

 Reports were received that quail were dying in numbers. When some 



