Natural Resources, School of

 

Date of this Version

9-1965

Citation

American Fisheries Society Meeting : Portland, Oregon (September 23-24, 1965).

Comments

Copyright 1965, the authors. Used by permission.

Abstract

First paragraph:

A small ultrasonic tag, 9 mm by 40 mm in size, has been developed by members of the fish orientation group at the University of Wisconsin. The tag emits a continuous signal at approximately 65 kc/sec. The signal is received via a directional hydrophone and a high quality communications receiver. Tracking ranges of up to 1 km have been obtained. The placement of the tag is internal: either into the stomach or into the body cavity of the fish. The tags and tracking equipment have been successfully employed in studies on the open water movements and orientation of white bass during their spawning migration.