The Korean Society of Marine Life Science
Journal of Marine Life Science eISSN 2508-7134
Year of Launching : 2016
Frequency : Twice a year (June 15, December 15)
Doi Prefix : 10.23005/ksmls.
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ISSN : (Print)
ISSN : 2508-7134(Online)
ISSN : 2508-7134(Online)
Journal of Marine Life Science Vol.8 No.2 pp.190-195
DOI : https://dx.doi.org/10.23005/ksmls.2023.8.2.190
DOI : https://dx.doi.org/10.23005/ksmls.2023.8.2.190
Acute Exposure to Karenia mikimotoi Induces Oxidative Stress and Reduces Immune Parameters in the Marine Medaka Oryzias javanicus
November 20, 2023 ;
November 24, 2023 ;
November 28, 2023
Abstract
In this research, the marine medaka Oryzias javanicus underwent a 96 h exposure to two concentrations of the red tide dinoflagellate Karenia mikimotoi (1,000 and 5,000 cells mL-1), and the temporal variations in biochemical responses related to antioxidant and immunity parameters were assessed in the liver tissue. The study revealed a significant increase in ichthyotoxicity with elevated cell concentrations of K. mikimotoi, especially evident at 96 h in marine medaka exposed to 5,000 cells mL-1. At 1,000 cells mL-1 of K. mikimotoi, the opercular respiratory rate showed a significant increase, whereas exposure to 5,000 cells mL-1 resulted in a lowered rate. The intracellular malondialdehyde content was significantly elevated in response to both cell concentrations at 96 h. Regarding glutathione content, levels were significantly increased by exposure to both cell concentrations. Catalase and superoxide dismutase enzymatic activities experienced an increase at 1,000 cells mL-1 of K. mikimotoi, while their activities were reduced at 5,000 cells mL-1 at 96 h. The analysis of two immunity parameters, alternative complement pathway and lysozyme, demonstrated significantly reduced activities in the liver tissue exposed to 5,000 cells mL-1 of K. mikimotoi. These findings aim to enhance the understanding of K. mikimotoi toxicity in marine fish by offering insights into biochemical responses associated with harmful algal blooms.