Abstract
A number of studies have shown that water hardness may have a sparing action on cadmium toxicity in freshwater fish and in the estuarine environment several investigators have stressed the role of calcium in an overall salinity effect of cadmium toxicity. Recent data on striped bass obtained by the US Fish and Wildlife Service indicate that the toxicity of cadmium to this species is higher in freshwater than in salt water. The current study was undertaken to elucidate the role of calcium in modifying cadmium toxicity in striped bass larvae and juveniles. Toxicity data were obtained from one-day-old, one-week-old and six-weeks-old animals from a single larval batch. In both fish and crustaceans there is evidence to suggest that cadmium may alter calcium metabolism. In one-week-old larvae calcium uptake was followed for 5 days in cadmium-exposed and cadmium free conditions and at two different calcium levels.
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