Document Type

Report

Department/Program

Virginia Institute of Marine Science

Publication Date

8-12-1988

Series

Data report (Virginia Institute of Marine Science) ; no. 29.

Abstract

Three sets of twelve oysters from the ,James River were placed in three recirculating aquaria dosed with the radioactive tracer zinc-65. All aquaria had the same amount of river bottom sediment which was kept in suspension by the water movement caused by aeration; one aquarium had twice as much tracer as the other two. The salinity of one of the low dose aquaria and. the high dose aquarium was maintained at 18 0/00: the other low dose aquarium was maintained at 1:2 0/00. All other factors were kept constant. Sediment-water-tracer mix was added to the aquaria every 12 hours. Water samples. taken immediately before and after the additions. were filtered with 0.45 micrometer membrane filters. The suspended sediment concentrations and the radioactivities of water and filters were measured. After 108 hours. the oysters were shucked and the dry weights and the radioactivities measured. Tracer uptak1e rates were calculated and the relationship between the uptake rate and body size was determined. That relationship was assumed to have the form: uptake equals the product of a constant times weight raised ti:> the power "b" (e.g. a x {body size)b). Values for the constants a and b were determined for each aquarium.

DOI

https://doi.org/10.21220/V5WK6K

Keywords

American Oyster, Zinc-Bioaccumulation, Crassostrea virginicia, James River, VA