Dynamics of endogenous and water cortisol release in Asian Sea bass Lates calcarifer after acute stress in a farm scale recirculating aquaculture system

Dynamics of endogenous and water cortisol release in Asian Sea bass Lates calcarifer after acute stress in a farm scale recirculating aquaculture system

Aquaculture Reports

10.1016/j.aqrep.2024.102223

http://dx.doi.org/10.1016/j.aqrep.2024.102223

Marie Ruoyun Tan, Khin Moh Moh Aung, Nur Asinah binte Mohamed Salleh, Jolin Yean Ai Tan, Kai Xin Chua, Gaynah Javier Doblado, Kai Lin Chua, Valarie Yu Yan Tham, Jovian Jing Lin, Vindhya Chaganty, Dinah Mardhiana Yusoff, Shubha Vij, Xiaodi Su, Laura Sutarlie, Caroline Lei Wee

cortisol, aquaculture, asian sea bass, recirculating aquaculture system, stress

01 July 2024

Tan, M. R., Aung, K. M. M., Mohamed Salleh, N. A. binte, Tan, J. Y. A., Chua, K. X., Doblado, G. J., Chua, K. L., Tham, V. Y. Y., Lin, J. J., Chaganty, V., Yusoff, D. M., Vij, S., Su, X., Sutarlie, L., & Wee, C. L. (2024). Dynamics of endogenous and water cortisol release in Asian Sea bass Lates calcarifer after acute stress in a farm scale recirculating aquaculture system. Aquaculture Reports, 37, 102223. https://doi.org/10.1016/j.aqrep.2024.102223

Stress in farmed fish is associated with poor feeding, slow growth, disease, and mortality. Therefore, it is essential to closely monitor stress levels in fish to optimize farming practices, which could then enhance productivity and welfare in aquaculture operations. Cortisol, a circulating stress hormone, is a reliable biomarker for evaluating fish stress. As blood sampling is highly invasive, alternative cortisol sampling methods such as fin, mucus, and the surrounding water that contains released cortisol, have been proposed as less invasive or non-invasive sampling methods. However, a comprehensive understanding of their temporal dynamics and associations with plasma cortisol levels is still lacking. In this study, we subjected Lates calcarifer, Asian sea bass within a farm-scale (3000 L tank, 9000 L system) and high-flow rate (8000 L/h) Recirculating Aquaculture System (RAS) to an acute handling stress challenge involving chasing and air exposure, and quantified cortisol dynamics within different biological samples, including blood, fin, and mucus, and in tank water from multiple sampling points. We showed that handling stress induced an expected increase in plasma and mucosal cortisol, peaking at 1 h and 24–48 h, respectively, and that plasma and mucosal cortisol were moderately correlated, especially during the stress period. Fin cortisol did not show consistent dynamics. Water cortisol similarly rose, but peaked within 40 min from the start of the stressor, in a pattern that was dependent on the site of sampling within the RAS system, likely due to RAS circulation dynamics. Our study is the first to examine the impact of stress on cortisol accumulation and release in Asian Sea bass in a farm-scale RAS, thus complementing existing research on the efficacy of fin, mucus, and water cortisol as stress indicators that could help optimize aquaculture productivity and welfare.

Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)

This research / project is supported by the A*STAR - Agritech and Aquaculture Horizontal Programme Office (A2HTPO) seed grant
Grant Reference no. : C211018003

https://oar.a-star.edu.sg/communities-collections/articles/20530

2352-5134

Institute of Molecular and Cell Biology

https://www.sciencedirect.com/science/article/pii/S2352513424003119?via%3Dihub