Excerpt from Sonic Equipment for Tracking Individual Fish After being released, their movements were fast and erratic for the first two to five seconds Following this interval the move ments of the tagged fish appeared normal in relation to the movements of the untagged fish. There was no evidence of untagged fish avoid ing the tagged fish within the holding pond. The tagged fish swam about freely and did not appear to prefer any specific area of the pond. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.