PROGRESS IN BIOLOGICAL INQUIRIES, 193 4 395 



In each of the other seven States of this rej^ion the Bureau detailed 

 an invent i<^ator to assist the Forest Service in streain-iin])r()venient 

 work. It was his duty to i)repare phins for the streams desi<rnatcd 

 by the Forest Service and to furnish technical supervision. These 

 men worked in 30 national forests in the re<^ion and planned 5,004 

 improvements, of which approximately half were completed this 

 season. This work was roconnnended for 153.8 miles of stream, or 

 4ii)proximately 3G structures per mile. The major part of the con- 

 struction was accomi)lished by the C. C. C, although some was 

 financed out of other Forest Service funds. 



In order to determine the ell'ectiveness of various devices in differ- 

 ent types of streams, each structure was tagged and notes were taken 

 concerning conditions before and after installation. A check of the 

 work following the spring run-off should indicate the most successful 

 structures for the streams of this regiim. 



In addition to stream improvement, a limited amount of lake 

 alteration was planned by these workers, liaising the outlet to in- 

 crease the area and installing brush covers to furnish shelter for 

 fish were carried out as experiments in a few selected lakes. 



COOPEEATION WITH THE UXIMiRSITY OF UTAH 



A number of advanced students registered for special work under 

 the Bureau's direction have been pursuing certain basic fishery in- 

 vestigations. Life-history studies of several species of fish are in 

 progress. A comparative study of some Utah trout streams and 

 studies of the rate of food recovery in streams affected by floods are 

 also being made. The collection of fishes which is being built up at 

 the University Museum will be of great value both for the instruc- 

 tion of students and for future studies in this region by the Bureau 

 or other investigators. 



The impetus given to the study of fishes and their environment 

 should aid greatly in the solution of the many problems confront- 

 ing the agencies concerned with maintaining the sport fishing in 

 this region. 



INVESTIGATIONS IS INTERIOR WATERS 



The extensive activities of the unit under the direction of Dr. 

 M. M. Ellis have been made possible not only by the cooperative 

 work of the various members of the staff, but also because of the 

 cooperation of the Corps of Engineers of the United States Army, 

 the Tennessee Valley Authority, and Division of Fish Culture of 

 the United States Bureau of Fisheries. Active work was main- 

 tained throughout the year at the Columbia (Mo.) laboratories and 

 at the substation. Fort Worth, Tex., and for considerable portion 

 of the year on the floating laboratory, U. S. Quarterboat 3Jf8 and 

 at the Neosho (Mo.) hatchery. 



During the past 12 months the activities have followed three 

 major lines. 



rOLLUTIOX STUDIES (F. P. 4 1 PROJECT) 



During the course of the pollution studies streams and other bodies 

 of water have been examined in 21 States, and a detailed survey of the 



