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Excerpt from Fishery Bulletin, 1970, Vol. 68 We have no positive evidence to indicate that the high nitrogen saturation in the Columbia River in 1967 caused serious mortality of adult salmon, but the possibility cannot be discounted. From the sur veys and searches made in 1967 it was obvious that it would be difficult to detect a continuous low rate of mortality in a river the size of the Columbia even with continuous surveillance. Various reports of mortality were received from local residents, but again it could not be established that fish had died from gas bubble disease. 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.