Multi-biomarker Responses to Cadmium Toxicity in Indian Green Mussel Perna viridis (Linnaeus, 1758)
Multi-biomarker Responses to Cadmium Toxicity in Indian Green Mussel Perna viridis (Linnaeus, 1758)
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Date
2022-02-02
Authors
K. L. Sreejamole
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Society of Fisheries Technologists (India)
Abstract
Bivalves are considered as good bioindicators for monitoring metal contamination in marine environment because of their ability to accumulate heavy metals in their soft tissues from sea water. Present study investigated biological response of Indian green mussel, Perna viridis (Linnaeus, 1758), to cadmium toxicity through antioxidant enzymes and overall accumulation during the period of study. The mussels were exposed to cadmium at different sublethal concentrations and the cadmium uptake and accumulation in the soft tissue were estimated after 21 days. Metallothionine formation in the cadmium exposed mussels were also evaluated. Results of the present study showed a definite linear increase in cadmium accumulation during the period of exposure. Mussels exposed to sub lethal concentrations of cadmium at 400 µg L-1, showed an overall gain of 1.466 µg g-1 and 1.981 µg g-1 on 15 and 21 days respectively. Cadmium exposure elicited a significant increase in metallothionein concentration in digestive gland of P. viridis, the concentration was found to increase with dose and period of exposure. Antioxidant enzyme levels were higher in hepatopancreas followed by gills on 15 and 21 days of exposure, except in the case of SOD which was higher in gills. Overall, the bioaccumulation of Cd2+ in P. viridis was found to display a concentration-dependent trend in antioxidant enzyme levels, with significant differences among different tissues exposed.
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Fishery Technology 59 (2022) : 33 - 38