MBL WHOI Libra™ . seriah 



Trial-and-error testing of new products in 

 ponds and raceways is complemented by 

 chemical analyses and blood tests. Bioassays 

 determine whether a particular food is doing 

 its job. 



Biochemical research with radioactive 

 tracers is adding greatly to knowledge of fish 

 nutrition and growth. Radioactive isotopes 

 provide Cortland's biochemists with a means 

 of tagging mineral elements, for example, to 

 determine whether trout absorb calcium 

 direct from the water they are in. 



TRAINrNG 

 SCHOOL 



Some of the most promising fish-culture 

 employees of the Fish and Wildlife Service 

 receive a year of training at Cortland. In 

 formal classes, in the laboratory, and in 

 supervised work on the station's trout, the 

 men are trained in fish culture and its re- 

 lated fields. Instruction includes such topics 

 as nutrition, fresh-water biology, physiology, 

 disease identification and control, water 

 analysis, hatchery techniques, and hatchery 

 administration. 



Because of the notable success of its com- 

 bination of theory and practical application, 

 Cortland has been visited by numerous fish- 

 ery administrators from other countries, as 

 well as by those from many parts of the 

 United States 



VISITORS 



WHSE 00101 



THIS IS 



Every year, Cortland receives thousands 

 of visitors. These include fish-culturists and 

 anglers, school classes, scouts, and other 

 groups, and families on a holiday. 



FISH-CULTURAL STATION 

 EXPERIMENTAL HATCHERY 

 TROUT-NUTRITION LABORATORY 

 IN-SERVICE TRAINING SCHOOL 



The Fish and Wildlife Service is a Federal 

 agency dedicated to the conservation of the 

 Nation's fish and wildlife resources. The 

 Service operates salmon, trout, and bass 

 hatcheries for stocking public waters ; main- 

 tains wildlife refuges ; controls predatory 

 animals ; enforces Federal laws for the con- 

 servation of fish and migratory birds; 

 promotes commercial fisheries; and engages 

 in fish and wildlife research. The Service's 

 regional office in Boston, Mass., supervises 

 activities in the Northeastern States. 



UNITED STATES 



DEPARTMENT OF THE INTERIOR 



FISH AND WILDLIFE SERVICE 



Circular 42 



* U. S, GOVERNMENT PRINTING OFFICE : 1956— 0-389134 



