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Effect of photoperiod on serum biochemistry, electrolytic balance, acute phase response and histopathology of butter catfish, Ompok bimaculatus (Bloch, 1794)

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Abstract

The present study was executed to evaluate the effect of photoperiod on serum biochemical parameters (glucose, cortisol, ALT, AST and LDH), electrolytic balance (Sodium and potassium), acute phase response (CRP) and histopathology (liver, kidney and skin) of an endangered high valued catfish, Ompok bimaculatus. Catfish (21.00 ± 1.53 cm and 30.00 ± 2.31 g) from the acclimatized stock were randomly distributed to six 120 × 45 × 60 cm3 FRP tanks (n = 20 fish per tank) and exposed to 1500 lx light intensity under different photoperiods [24:0 light: dark (L: D), 15L: 9D, 12L: 12D, 9L: 15D, 0L: 24D and a natural photoperiod (control)], and fed at a daily rate of 2% of bodyweight, twice a day for 60 days. Serum glucose, cortisol and enzymes including aspartate transaminase (AST), lactate dehydrogenase (LDH), alanine transaminase (ALT), and acute phase reactant, such as C-reactive protein (CRP) increased significantly (P < 0.05) in continuous light (24L: 0D), continuous dark (0L: 24D) and short day (9L: 15D) photoperiods, whereas in 15L: 9D and 12L:12D photoperiods, those were in decreasing trend. Serum electrolytes, i.e. potassium level was elevated and sodium level was declined in 24L: 0D, 0L: 24D and 9L: 15D photoperiod groups. Moreover, significant histological alterations in the liver, kidney and skin tissue were also evidenced in the experimented catfish. Typical polygonal hepatocytes with normal blood vessels in liver and normal organization of kidney were seen in catfish of 15L: 9D group. Histological analysis of other groups displayed nuclear degeneration, karyorrhexis, karyolysis, melanomacrophages, nuclear hypertrophy, sinusoid dilation and vacuolar degeneration in liver and hyaline droplets accumulation, granular degeneration, fragmentation of glomerulus and focal necrosis of epithelial cells in kidney. Additionally, general structure of the skin was observed in control group as well as in 15L: 9D group. Contrarily, in 24L: 0D group increased number of mucous cells and vacuoles was observed in the skin of butter catfish. In 9L: 15D and 0L: 24D photoperiods, O. bimaculatus exhibited ruptured epithelial cells, enlarged alarm cells, fat cells, necrotic cells and vacuoles in the skin tissue. The present study depicted that 15L: 9D photoperiod can induce better health of catfish, O. bimaculatus, which, in turn, can help farmers to increase the production of this high valued catfish in future.

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Acknowledgements

The authors express sincere thanks to the Director, ICAR-Central Institute of Freshwater Aquaculture, Bhubaneswar, India, for supporting and providing the necessary research facilities. Furthermore, the authors express their gratitude to the Vice-Chancellor, WBUAFS, Kolkata for providing necessary infrastructure and support.

Funding

The financial assistance (BT/PR25141/NER/95/1039/2017) to this work from Department of Biotechnology, Govt. of India, is dully acknowledged.

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A.D.: carried out the field experiment and original draft preparation. F.H.: methodology, writing—draft preparation, review and editing, supervision. A.K.M.: methodology, data curation. J.K.S.: funding acquisition, conceptualization, resources, writing—review and editing, validation. P.C. and G.D.: resources, writing and supervision. G.B.: editing of the manuscript. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Jitendra Kumar Sundaray.

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The authors declare no competing interests.

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The study was conducted according to the guidelines and policies of the ethical committee of Indian Council of Agriculture and Research-Central Institute of Freshwater Aquaculture.

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Abhijit Das and Farhana Hoque should be considered joint first author.

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Das, A., Hoque, F., Ajithkumar, M. et al. Effect of photoperiod on serum biochemistry, electrolytic balance, acute phase response and histopathology of butter catfish, Ompok bimaculatus (Bloch, 1794). Fish Physiol Biochem 49, 1339–1355 (2023). https://doi.org/10.1007/s10695-023-01260-y

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