Fish and Wildlife Technical Report 



This publication series of the Fish and Wildlife Service comprises reports of investigations related to fish or wildlife. 

 Each is published as a separate paper, but for economy several may be issued in a single cover. The Service distributes 

 a limited number of these reports for the use of Federal and State agencies and cooperators. See inside back cover 

 for a list of recent issues. 



Copies of this publication may be obtained from the Publications Unit, U.S. Fish and Wildlife 

 Service, 18th and C Streets, NW., Mail Stop 1111, Room 130, Arlington Square Building, 

 Washington, DC 20240, or may be purchased from the National Technical Information Service 

 (NTIS), 5285 Port Royal Road, Springfield, VA 22161. 



ISSN 0899-3505 



