Abstract
Commercial aquaculture production of channel catfish (Ictalurus punctatus) occurs in shallow ponds with daily cycling of dissolved oxygen concentration ranging from supersaturation to severe hypoxia. Once daily minimum dissolved oxygen concentration falls below 3.0 mg O2/L, channel catfish have a reduced appetite, leading to reduced growth rates. In other fishes, upregulation of the neuropeptides corticotropin-releasing factor (CRF) and urotensin I (UI) have been implicated as initiating the mechanism responsible for decreasing appetite once an environmental stressor is detected. Channel catfish maintained at 27 °C in aquaria were subjected to varying durations and patterns of hypoxia (1.75 ± 0.07 mg O2/L) to evaluate underlying physiological responses to hypoxia and determine if hypothalamic CRF and UI are responsible for hypoxia-induced anorexia in channel catfish. During a short exposure to hypoxia (12 h), venous Po2 was significantly lower within 6 h and was coupled with an increase of hematocrit and decrease of blood osmolality, yet all responses reversed within 12 h after returning to normoxia. When this pattern of hypoxia and normoxia was repeated cyclically for 5 days, these physiological responses repeated daily. Extended periods of hypoxia (5 days) resulted in similar hematological responses, which did not recover to baseline values during the hypoxia exposure. This study did not find a significant change in hypothalamic transcription of CRF and UI during hypoxia challenges but did identify multiple physiological adaptive responses that work together to reduce the severity of experimentally induced hypoxia in channel catfish.
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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
This project was funded by U. S. Department of Agriculture-Agricultural Research Service project 6402-13320-004-00D, USDA-ARS project 58-6066-5-042, USDA National Institute of Food and Agriculture project 1006942, and the Mississippi Agricultural and Forestry Experiment Station. We would like to thank Landon Chisolm, Reese Mascagni, and Geoff Waldbieser for their assistance in the development and execution of this project. Brian Bosworth and Caitlin Older provided helpful reviews of this manuscript. Mention of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by USDA.
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All experimental protocols were performed in compliance with the Warmwater Aquaculture Research Unit Institutional Animal Care and Use Committee (IACUC FY17-005).
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Ott, B.D., Chisolm, D.O., Griffin, M.J. et al. Effect of hypoxia duration and pattern on channel Catfish (Ictalurus punctatus) neuropeptide gene expression and hematology. J Comp Physiol B 193, 631–645 (2023). https://doi.org/10.1007/s00360-023-01521-5
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DOI: https://doi.org/10.1007/s00360-023-01521-5