655 resultados para Naval Research Laboratory (U.S.)


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"This work has been supported in part by the Office of Naval Research under Contract NR 044 001"

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"This work was supported in part by the Office of Naval Research under Contract No. Nonr-1834(15)"

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"This report is a product of the Laboratory Simulation of Spectral and Directional Spectral Waves Work Unit, Coastal Flooding and Storm Protection Program, Civil Works Research and Development, at the US Army Engineer Waterways Experiment Station's Coastal Engineering Research Center."--Preface.

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"January 1977."

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"November 1989."

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"January 1964."

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"March 1964."

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"Atomic Energy Commission Contract AT(11-1)-490."

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Part of the Radioisotopes in Industry Training Program of the General Motors Isotope Laboratory.

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The objective of this study was to determine the effects, if any, of sublethal concentrations of suspended materials on the fish in estuarine systems. Experimental sediment suspensions reproduced the concentrations frequently found during flooding and at dredging sites and dredged-material disposal sites. The suspensions were of natural sediment, obtained from the Patuxent River estuary, Maryland, or commercially available Fuller's earth. Fish were collected in the Patuxent River estuary and transported to the laboratory. The selected fish species inhabited ecologically different sections of the estuary; therefore, the overall reactions of each species were unique. Seven species of estuarine fish were exposed to Fuller's earth and natural sediment suspensions for timed periods and hematological changes were noted. The effects of various concentrations of Fuller's earth suspensions on white perch gill tissue were determined. Oxygen consumption rates of striped bass, white perch, and toadfish were measured in filtered Patuxent River water and compared to consumption rates in filtered river water suspensions of Fuller's earth or Patuxent River sediment. Fish showed signs of stress in response to suspended sediments in most of the experiments. Results indicate that sublethal concentrations of suspended solids can affect estuarine fish.

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"April 1977."

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"Contract No. 954471 under NAS 7-100 SRI Project PYU 4980."

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"Contract 954694."

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"Contract 954694."

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"Contract 954694."