448 U. S. BUREAU OF FISHERIES 



the Department of the Interior, the Tennessee Valley Authority, 

 various State organizations, and several industrial concerns. 



The future work of this unit calls for advancing as rapidly as 

 possible the detailed studies of the effluents themselves, as only 

 through an understanding of the actions of these effluents on fish 

 and other aquatic life can remedial measures be expected. Besides, 

 new types of effluents are constantly appearing as new industrial 

 developments are made. 



The surveys of ]5articular streams having specific pollution prob- 

 lems are to be furthered as rapidly as funds permit, as the work of 

 this unit has by no means covered all of the types of existing 

 stream pollution. 



MUSSEL PROPAGATION 



During the past year the long-time experiments on growing fresh- 

 water mussels in restricted areas have been continued at Fort Worth, 

 Tex. These experiments, which will tell their complete story only 

 after several years of actual test under practical conditions such as are 

 being maintained at Fort Worth, continue to give promising returns. 

 It is interesting in this connection to note that similar efforts are 

 being made with some success to raise oysters in crates and confined 

 areas off the bottom in silt-laden water, utilizing methods similar 

 to those employed at Fort Worth with fresh-water mussels. 



INDEPENDENT ACTIVITIES OF THE FISHERIES BIOLOGICAL 

 LABORATORIES 



WOODS HOLE, MASS, 



Owing to lack of funds, the Woods Hole laboratory was not main- 

 tained on an operating basis in 1935. Although facilities were 

 utilized in connection with the oyster investigations reported upon 

 elsewhere, no independent activities were possible. 



This condition not only retards progress in the Bureau's fishery 

 investigations, but also loses to the Bureau the advantage formerly 

 gained from results obtained by independent investigators through 

 use of the laboratory's facilities. Correction of this condition is 

 urgent. 



BEAUFORT, N. C. 



Facilities for the study of marine-fishery problems of the South 

 Atlantic region were provided throughout the year by the Beaufort 

 laboratory under the direction of Dr. H. F. Prytherch. The chief 

 investigations conducted here by the Bureau's staff, as reported in 

 detail elsewhere, consisted of experiments and studies with ref- 

 erence to (1) the biology and control of the oyster drill, (2) the 

 distribution and abundance of oyster pests in the coastal waters 

 of Virginia, North Carolina, South Carolina, and Georgia, (3) a 

 protozoan parasite of the oyster, (4) an improved method of han- 

 dling oyster meats, (5) the develoi)ment of the ovaries of the com- 

 mercial shrimp, and (6) food of the commercial shrimp. 



The laboratory serves as headquarters for oyster investigations in 

 the South Atlantic and Gulf States, and has cooperated with the 

 conservation departments of Virginia, North Carolina, South 



