Regulation of zinc concentration by Palaemon elegans (Crustacea: Decapoda): zinc flux and effects of temperature, zinc concentration and moulting

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Abstract
The shrimp P. elegans regulated body Zn concentrations when exposed to ambient Zn concentrations up to 100 .mu.g Zn l-1 regulation apparently being achieved by the rate of Zn loss varying to equal Zn uptake. Flux of Zn through the shrimp (followed using Zn-65 as a tracer) increased with temperature and external Zn concentration. The relation between Zn flux and external Zn concentration was linear in dissolved Zn concentrations between 10 and 42.5 .mu.g Zn l-1. Zn flux did not vary with size (dry weight) of shrimps. Total body Zn consists of a number of components pools (fast and slow) exchanging at different rates, the pool sizes varying with the rate of Zn flux through the shrimp. The pools are thus features of rate processes, not discrete physical entities. Molting increased accumulation of labeled Zn from surrounding seawater.
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