Excerpt from Fishery Bulletin, Vol. 75: January 1977 Summaries of survey data by species and area permit preliminary evaluation of the magnitude and direction of change in selected biomass components in recent years and of the degree of year-to-year variability that may be encountered. Accordingly, we examined trends for different species and strata sets and for data summed over all strata before attempting transformation or weighting procedures. 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.