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<br />. <br /> <br />PREFACE <br /> <br />This manual was published under Research Objective Achievement Plan <br />lBA027-05AEF, "Methods for Determining Biological Parameters of all <br />Waters," as part of the National Analytical Methods Development Research <br />Program. The manual was prepared largely by a standing committee of senior <br />Agency biologists organized in 1970 to assist the Biological Methods Branch <br />in the selection of methods for use in routine field and laboratory work in <br />fresh and marine waters arising during short-term enforcement studies, water <br />quality trend monitoring, effluent testing and research projects. <br />The methods contained in this manual are considered by the Committee <br />to be the best available at this time. The manual will be revised and new <br />methods will be recommended as the need arises. <br />The Committee attempted to avoid duplicating field and laboratory <br />methods already adequately described for Agency use in Standard Methods <br />for the Examination of Water and Wastewater, 13th edition, and frequent <br />reference is made to this source throughout the manual. <br />Questions and comments regarding the contents of this manual should be <br />directed to: <br /> <br />Cornelius I. Weber, Ph.D. <br />Chief, Biological Methods Branch <br />Analytical Quality Control Laboratory <br />National Environmental Research Center <br />U.S. Environmental Protection Agency <br />Cincinnati, Ohio 45268 <br /> <br />. <br /> <br />v <br />