Potassium amendment of inland saline groundwater: Insights into the physiological responses of silver pompano Trachinotus blochii (Lacepede, 1801) at different salinities

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Ionic composition, Enzymatic prfile and proximate composition of Silver Pompano in Inland saline ground water


  • Madhuri S. Pathak ICAR - Central institute of Fisheries Education
  • Wazir S. Lakra Dr.
  • Appidi K. Reddy Dr.
  • N. K. Chadha Dr.
  • Prem P. Srivastava Dr



Silver pompano, Potassium amendment, Inland saline groundwater, Salinity, Antioxidant Activity, Metabolic enzymes, Proximate composition


A trial was conducted to evaluate the effect of graded levels of potassium (K+) amended inland saline groundwater (ISW)
on serum ionic composition, antioxidant and metabolic enzymes [Na+/K+ATPase, Catalase, Superoxide dismutase (SOD),
Glutathione peroxidase (GPx), Glutathione S-transferase (GST), Lactate dehydrogenase (LDH), aspartate aminotransferase
(AST)] activities of silver pompano, Trachinotus blochii (Lacepede, 1801). The ISW was amended with 100% K+ at 5 ppt
(ISW5), 10 ppt (ISW10) and 15 ppt (ISW15) and reconstituted seawater (RSW) with similar salinities (RSW5, RSW10 and
RSW15) was employed as a reference medium. Experiment was conducted using completely randomised design. T. blochii
juveniles (1.5±0.5 g) were reared in 300 l capacity circular FRP tanks for 90 days. Fish were fed with commercial extruded
floating feed. At the end of experimental period, serum ionic composition, enzymatic profiles and proximate composition
were estimated. Results of the study showed that the serum ionic content (K+, Na+, Ca2+ and Mg2+) varied dose-dependently
with salinity (p<0.05). Na+/K+ATPase, antioxidant enzymes (Catalase and SOD) and metabolic enzymes (GPx, GST, LDH
and AST) showed higher activities at lower salinity (ISW5 and RSW5) compared to fish reared at 10 ppt and 15 ppt ISW.
Similarly, proximate composition exhibited significantly (p<0.05) lower protein and lipid content at lower salinity (ISW5
and RSW5) signifying the stress condition at lower salinity. Physiological responses of T. blochii in terms of serum ionic
composition, enzymatic profile and proximate composition were optimum at 10 and 15 ppt amended ISW, implying that
rearing at 10-15 ppt with 100% K+ amendment of inland saline groundwater is appropriate.

Keywords: Antioxidant activity, Inland saline groundwater, Metabolic enzymes, Potassium amendment, Proximate composition


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Author Biography

Madhuri S. Pathak, ICAR - Central institute of Fisheries Education

Scientist, Division of Aquaculture


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How to Cite

Pathak, M. S., Lakra, W. S., Reddy, A. K., Chadha, N. K., & Srivastava, P. (2023). Potassium amendment of inland saline groundwater: Insights into the physiological responses of silver pompano Trachinotus blochii (Lacepede, 1801) at different salinities: Ionic composition, Enzymatic prfile and proximate composition of Silver Pompano in Inland saline ground water. Indian Journal of Fisheries, 70(1). https://doi.org/10.21077/ijf.2023.70.1.128657-10