PROGRESS IN BIOLOGICAL INQUIRIES, 1934 391 



losis have been observed frequently among fish on different diets. 

 WIiat<.»ver the explanation, these exi)eriments evidently lend little 

 support to the view that iodine is a specific cure for furunculosis. 



STREAM SURVEY AND STREAM IMPROVEMENT 



Durino; the summer of 1934 the Bureau inaugurated an extensive 

 series of stream survey and improvement work in the national forests 

 and parks in cooperation with the United States Forest Service and 

 the United States Park Service. This work was made possible by 

 an allotment of $127,r)00 from the Public Works Administration. 



Stream, survn/s. — The stream survej^s were conducted by IG parties 

 operating in forests and parks in various parts of the country. In 

 most cases each party was composed of a biologist in charge, three 

 assistant biologists, and a camp attendant. The equipment of each 

 party consisted of a complete camping outfit, a SiA-ton pick-up truck, 

 and the necessar}^ apparatus for collecting physical, chemical, and 

 geological data on lakes and streams. Because of climatic conditions, 

 the time spent in the field varied greatly in different sections. One 

 of the survey parties in the South, for instance, was in the field for 

 over 8 months while those w^orking at high altitudes in the West were 

 in the field for only 3 months. 



The primary purpose of the surveys is to provide an inventory of 

 conditions in each lake and stream which affect the fish population. 

 With this information at hand it will be possible to determine wdiat 

 species of fish is best adapted to each body of water and the number 

 it can support most advantageously. This knowledge is essential for 

 the development of a rational ancl systematic stocking policy wdiich 

 will make possible the most efficient utilization of forest waters. In 

 the absence of such basic information, fish are frequently planted ia 

 waters to which they are not adapted, and in numbers which have- 

 no relation to the productive capacity of the stream. 



In the East four parties surveyed completelj'^ or in part the Great 

 Smoky Mountains National Park in North Carolina and Tennessee, 

 and the following national forests: White INIountain and Green 

 Mountain in New England, George Washington and Monongahela 

 in Virginia and AVest Virginia, and Pisgah and Nantahala in North 

 Carolina, South Carolina, and Georgia. The 12 parties operating in 

 the Rocky IMountain region covered completely or in part the Glacier 

 National Park and the following national forests: Wyoming, 

 Challis, Sawtooth, Cache, Wasatch, Papaho, Humboldt, Santa Fe,. 

 Carson, Coconino, Apache, Tonto, Crook, Mono, Inyo, Sequoia,. 

 Shasta, and Klamath. 



A report including the important data collected by the survey 

 parties and recommendations for stocking has been prepared for each 

 forest. These reports give brief accounts of the physiography of 

 the region followed by a description of the princi]5al streams and 

 lakes of each Avatershed, including the physical and chemical char- 

 acteristics and accessibility. This i,s followed by a discussion of 

 the biological characteristics of each body of water, including the 

 fishes and other vertebrates, the kinds and relative abundance of 

 food organisms, and the presence of aquatic plants. A summary 



