Backgrounds: The influence of ocean acidification (OA) is particularly significant on calcifying organisms in marine environment. A possible explanation for acidification-induced changes in fish behaviour is that acidification interferes with marker enzymes in the liver, muscle and brain. Under a range of severe environmental circumstances, marine organisms can be susceptible to oxidative stress and results in the changes in the biochemical components which can be assessed to know the health status of organisms.
Aim of the Works: The aim of this study is to observe the impact of ocean acidification in Asian seabass Lates calcarifer and to employ a large number of biomarker to discover distinct and unique patterns. For this the fingerlings of L. calcarifer were exposed to OA, in order to understand the changes in marker enzymes in liver, muscle and brain of L. calcarifer.
Methodology: Fish fingerlings were exposed to OA condition with two different pH (7.8 and 7.5) for a period of 9 weeks in order to assess changes in biomarker. Acid phosphatase (ACP) and alkaline phosphatase (ALP), alanine transaminase (ALT), and aspartate transaminase activity (AST) were examined in the liver, brain and muscles of fish.
Results: The Liver has considerably higher in ACP and ALP enzymes after 3 weeks of OA exposure. AST and ALT marker enzymes were induced in the brain at greater levels and in most cases, the entire marker enzymes in the liver, muscle and brain were concentration dependent and also the exposure period. The observed changes in marker enzymes which detected in the brain and liver tissues of L. calcarifer were statistically significant.
Conclusions: The present study showed a significant association between the entire biomarkers tested in fish exposed to OA. Overall, the results indicate that brain and liver is the most vulnerable component to OA exposure when compared to muscles and brain it may be employed as a bioindicator of OA exposure.
Karthikeyan S., Sureshkumar P., Dinakaran C., Chezhian A. & Soundarapandian P., 2024. Impact of ocean acidification on marker enzymes in Asian seabass Lates calcarifer. Uttar Pradesh Journal of Zoology 45(23): UPJOZ.4380. doi:
10.56557/upjoz/2024/v45i234681. Article.
