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Effect of sulfate on the osmoregulatory and physio-biochemical responses of GIFT (Oreochromis niloticus) juveniles reared in potassium-deficient medium saline waters

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Abstract

The inland saline waters were continuously observed to have low potassium concentrations compared to their seawater counterpart of the same salinity. We hypothesize that the toxic effect of sulfate may manifest in low potassium saline (LPSW) waters compared to brackish water of the same salinity. Thus, LC50 trials were performed in GIFT (genetically improved farmed tilapia) fry (0.5 ± 0.02 g) to determine the acute sulfate toxicity in freshwater (FW, 0.5 g L−1), artificial seawater (ASW, 10 g L−1), and LPSW (10 g L−1). The median lethal concentrations (96h LC50) of sulfate ion in FW, LPSW, and ASW for the GIFT were 5.30 g L−1, 2.56 g L−1, and 2.98 g L−1, respectively. A second experiment was conducted for 21 days, exposing fish to a sub-lethal level of sulfate ion (SO42−) concentration (1000 mg L−1, one-fifth of FW LC50) with different types of waters (FW, freshwater, 0.5 g L−1; ASW, artificial seawater, 10 g L−1; LPSW, low potassium saline water, 10 g L−1) with and without sulfate inclusion to constitute the treatments as follows, (FW, FW + SO4, ASW, ASW + SO4, LPSW, LPSW + SO4). The effect of sulfate on GIFT reared in sulfate-rich potassium-deficient medium saline water was evaluated by focusing on the hematological adjustments, stress-induced oxidative damage, and osmoregulatory imbalances. The survival was not altered due to the sulfate concentration and K+ deficiency; however, there were significant changes in branchial NKA (Na+/K+-ATPase) activity and osmolality. The increase in NKA was highest in LPSW treatment, suggesting that internal ionic imbalance was triggered due to an interactive effect of sulfate and K+ deficiency. The cortisol levels showed a pronounced increase due to sulfate inclusion irrespective of K+ deficiency. The antioxidant enzymes, i.e., SOD (superoxide dismutase), catalase, GST (glutathione-S-transferase), and GPX (glutathione peroxidase), reflected a similar pattern of increment in the gills and liver of the LPSW + SO4 groups, suggesting a poor antioxidant status of the exposed group. The hepatic peroxidation status, i.e. TBARS (thiobarbituric acid reactive substances), and the peroxide values were enhanced due to both K+ deficiency and sulfate inclusion, suggesting a possible lipid peroxidation in the liver due to handling the excess sulfate anion concentration. The hematological parameters, including haemoglobin, total erythrocyte count, and hematocrit level, reduced significantly in the LPSW + SO4 group, indicating a reduced blood oxygen capacity due to the sulfate exposure and water potassium deficiency. The hepatic acetylcholine esterase activity was suppressed in all the treatments with sulfate inclusion, while the highest suppression was observed in the LPSW + SO4 group. Thus, it is concluded that sulfate-induced physiological imbalances manifest more in potassium-deficient water, indicating that environmental sulfate is more detrimental to inland saline water than freshwater or brackish water of the same salinity.

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Funding

The research is partially funded by the National Agricultural Higher Education Project (NAHEP- World Bank and Indian Council of Agricultural Research) with grant number [1010041].

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All authors contributed to the study’s conception and design. Tincy Varghese conceptualized the research; experimental designing was performed by Subrata Dasgupta, Subodh Gupta, and Narottam Prasad Sahu. Data analysis, data curation, original drafting, writing review, and revision were performed by Shivangi Bhatt, Vattiringal Jayadradhan Rejish Kumar, and Tincy Varghese. Shivangi Bhatt wrote the first draft of the manuscript, and all authors commented on previous versions. All authors read and approved the final manuscript. The data supporting this study’s findings are available from the corresponding author upon reasonable request.

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Correspondence to Tincy Varghese.

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The study protocol was performed in the Fish Nutrition, Biochemistry, and Physiology Division of the Central Institute of Fisheries Education Mumbai following the approved guidelines of CPCSEA Standard Operating Procedures (SOP) intended for the care and use of animals in scientific research.

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Bhatt, S., Dasgupta, S., Gupta, S. et al. Effect of sulfate on the osmoregulatory and physio-biochemical responses of GIFT (Oreochromis niloticus) juveniles reared in potassium-deficient medium saline waters. Environ Sci Pollut Res 31, 18636–18655 (2024). https://doi.org/10.1007/s11356-024-32219-y

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  • DOI: https://doi.org/10.1007/s11356-024-32219-y

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