The Influence of Thermal Stress on Cadmium Uptake in Arctic Charr (Salvelinus alpinus) and Its Effects on Indicators of Fish Health and Condition, with Implications for Climate Change.

Martyniuk, Mackenzie Anne Clifford ORCID: https://orcid.org/0000-0002-7492-3989; Garnier, Camille et Couture, Patrice ORCID: https://orcid.org/0000-0002-1944-5136 (2025). The Influence of Thermal Stress on Cadmium Uptake in Arctic Charr (Salvelinus alpinus) and Its Effects on Indicators of Fish Health and Condition, with Implications for Climate Change. Environments , vol. 12 , nº 6. p. 176. DOI: 10.3390/environments12060176.

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Résumé

Given the implications of heat stress on contaminant uptake and the importance of salmonid fish to Northern Indigenous peoples, investigating temperature-driven patterns in trace metal bioavailability is essential for assessing climate change risks. Here, juvenile Arctic charr were exposed for 8 weeks to cadmium (Cd) at a nominal concentration of 3 µg·L⁻¹ (measured Cd: 1.81 ± 0.47 µg·L⁻¹) or controls (measured Cd: 0.03 ± 0.03 µg·L⁻¹) at a low (6 °C) or high (16 °C) temperature. Cd concentrations were measured in dorsal muscle, liver, and kidney tissues, and antioxidant (superoxide dismutase (SOD), catalase (CAT)) and anaerobic (lactate dehydrogenase (LDH)) capacities were assessed in liver tissue. Elevated temperatures significantly increased Cd uptake in analyzed tissues. Log₁₀SOD activity decreased in the 6 °C-Cd treatment, while log₁₀CAT activity declined in high-temperature treatments and log₁₀LDH activity was reduced in Cd-exposed groups. The results highlight the influence of temperature, but also of combined thermal and trace metal stressors on Arctic charr’s antioxidant and anaerobic capacities. Biometric data indicate that temperature exerted a stronger negative influence on growth than Cd, with synergistic effects of temperature and Cd on the hepatosomatic index. Overall, this research highlights the thermal stress impacts on Cd uptake and Arctic charr physiology.

Type de document:	Article
Mots-clés libres:	arctic charr; cadmium; thermal stress; enzyme activity; climate change
Centre:	Centre Eau Terre Environnement
Date de dépôt:	18 juill. 2025 15:15
Dernière modification:	18 juill. 2025 15:15
URI:	https://espace.inrs.ca/id/eprint/16567

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