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Title: Effects of suspended dredged material on aquatic animals
Authors: Peddicord, Richard K.
McFarland, Victor A.
Keywords: Aquatic animals--Effect of dredging on
Invertebrates--Effect of dredging on
Suspended sediments--Environmental aspects
Aquatic animals
Publisher: U.S. Army Engineer Waterways Experiment Station
Series/Report no.: Technical Report (Dredged Material Research Program (U.S.)) ; no. D-78-29
Abstract: This report describes laboratory research designed to evaluate the impact of suspensions of relatively uncontaminated and contaminated harbor sediments on juvenile and adult marine, estuarine and freshwater fish and invertebrates. Studies of survival and tissue accumulation of contaminants were conducted for 21 days exposure to suspended sediments in a flow-through aquarium system. Even the most sensitive fish survived days of continuous exposure to suspensions of relatively uncontaminated sediment on the order of grams per litre, and the invertebrates generally survived similar exposures to tens of grams per litre of relatively uncontaminated sediment. Exposure to suspensions of contaminated sediment decreased survival substantially, but, even so, mortality occurred only after exposure to higher concentrations for longer time periods than are created in the water column by the typical dredging operation. Only fingerling striped bass, Morone saxatilis showed a sensitivity great enough to indicate a potential cause for concern from continuous pipeline discharge of highly contaminated dredged material. While water column impacts generally appeared to warrant little concern, the data Indicate the potential for impact of contaminated fluid mud on benthic infauna and relatively immobile epifauna. Fluid muds with suspended sediment concentrations of tens of grams per litre can be created on the bottom by pipe-line, and perhaps hopper, disposal of hydraulically dredged fine-grained sediment. These can persist for sufficient periods to have a potential for Impact on relatively immobile bottom dwellers, particularly if highly contaminated sediments are involved. Tissue uptake of contaminants from suspensions of highly contaminated sediment was limited. Of 100 species-salinity-contaminant combinations where uptake might have been measured, it actually occurred in less than one fourth of the cases.
Description: Technical Report
Gov't Doc #: Technical Report D-78-29
Rights: Approved for Public Release; Distribution is Unlimited
Appears in Collections:Technical Report

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