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Title: Aquatic disposal field investigations, Duwamish Waterway disposal site, Puget Sound, Washington : appendix A, effects of dredged material disposal on demersal fish and shellfish in Elliott Bay, Seattle, Washington
Authors: Hughes, John R.
Ames, Warren E.
Misitano, David A.
Slusser, George F.
Keywords: Aquatic ecology
Puget Sound (Wash.)
Dredging spoil
Dredged material
Fish populations
Dredged Material Research Program (U.S.)
Publisher: U.S. Army Engineer Waterways Experiment Station
Series/Report no.: Technical Report (Dredged Material Research Program (U.S.)) ; no. Technical Report D-77-24; Appendix A
Abstract: A cooperative research program, sponsored by the Office, Chief of Engineers, U.S. Army, was conducted in Elliott Bay near Seattle, Wash., to determine the effects of disposal of dredged material from the Duwamish Waterway in open water. The study involved several agencies, both public and private, investigating various aspects of the disposal operation. The research described in this report was conducted by the National Marine Fisheries Service of the National Oceanic and Atmospheric Administration to determine the effects of dredged material disposal on demersal fish and shellfish at the disposal site. A standard Marinovich "try net" was used to sample the disposal site and two reference sites. Catches, of both fish and shellfish were inconsistent at the three sites with respect to both numbers and species, indicating a seasonal fluctuation in both abundance and composition. Statistical analyses showed that differences in abundance and composition were significant among the different sampling sites and the different sampling periods. However, experimental design and inherent differences among the sampling sites made it difficult to determine whether the catch differences were attributable to effects of the dredged material disposal or simply manifestations of population fluctuations due to migratory behavior patterns. It was concluded that the quantity of dredged material dumped during the study did not have a lasting detrimental effect on the demersal fish and shellfish populations at the disposal site. The investigators recommend (a) that any future study include a longer period of time for collecting baseline data, (b) that the characteristics of the reference sites be more comparable to those of the disposal site, and (c) that the disposal operations be conducted in a manner similar to that which is used in actual practice so the results might have general application.
Description: Technical Report
Gov't Doc #: Technical Report D-77-24; Appendix A
Rights: Approved for Public Release; Distribution is Unlimited
Appears in Collections:Technical Report

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