Size dependence of zinc elimination and uptake from water by mosquitofish Gambusia affinis (Baird and Girard)

Zinc-elimination rate constants decreased with increasing fish size as described in the equation k e = 0.001 (dry wt.) −0.42. One compartment displaying a median biological half-life of 215 days was identified. Additional compartments were not discernable using backstripping methods. Zinc-uptake rat...

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Bibliographic Details
Published in:Aquatic toxicology 1988, Vol.12 (1), p.17-32
Main Authors: Newman, Michael C., Mitz, Stephen V.
Format: Article
Language:English
Subjects:
Animal, plant and microbial ecology
Applied ecology
Biological and medical sciences
Ecotoxicology, biological effects of pollution
Elimination
Fish
Fresh water environment
Freshwater
Fundamental and applied biological sciences. Psychology
Gambusia affinis
Size
Uptake
Zinc
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Summary:Zinc-elimination rate constants decreased with increasing fish size as described in the equation k e = 0.001 (dry wt.) −0.42. One compartment displaying a median biological half-life of 215 days was identified. Additional compartments were not discernable using backstripping methods. Zinc-uptake rates from water also decreased with increasing fish size. The equation describing this relationship was k u = 0.029 (dry wt.) −0.90. Size-dependent relationships for body burdens of Zn in G. affinis were derived by combining the effects of size-dependent uptake from water and elimination kinetics. A non-equilibrium approach incorporating fish size and duration of exposure was used to generate relationships between fish size and Zn-body burden with exponents ( b values) less than 1. As duration of exposure increased, the b values for the size-dependent body-burden relationships also increased.
ISSN:0166-445X
1879-1514
DOI:10.1016/0166-445X(88)90016-1