Water cortisol is a reliable indicator of stress in European sea bass, Dicentrarchus labrax.

Saved in:

Bibliographic Details
Title:	Water cortisol is a reliable indicator of stress in European sea bass, Dicentrarchus labrax.
Authors:	Fanouraki, E., Papandroulakis, N., Ellis, T., Mylonas, C. C., Scott, A. P., Pavlidis, M.
Source:	Behaviour. Oct2008, Vol. 145 Issue 10, p1267-1281. 15p. 4 Graphs.
Subjects:	Hydrocortisone, European seabass, Blood plasma, Water, Physiological stress, Glucocorticoids
Abstract:	This study examined cortisol release into the water by European sea bass, Dicentrarchus labrax. The time-course of plasma and water cortisol concentrations were determined in adult fish subjected to acute stress, by sampling blood and water at 0 h (before stress) and 0.5, 1, 2, 4, 8 and 24 h after stress. Sea bass showed a typical stress response, with plasma glucose and lactate concentrations peaking at 2 h, and plasma cortisol levels peaking at 1 h. Cortisol release rate into the water increased in response to stress and was positively correlated with plasma cortisol concentrations. In a further trial, juvenile fish were confined at densities of 20 and 50 kg/m3 and water cortisol was evaluated over a 24 h period. Cortisol release rates peaked between 0–1 h in the high and 1–2 h in the low density group. In conclusion, these results provide strong evidence that cortisol release rate into the water can be used as a non-invasive method for the assessment of the stress response and that although sea bass presents a high blood stress response after exposure to acute husbandry stressors, it is releasing less cortisol into the water compared to other species previously examined. [ABSTRACT FROM AUTHOR]
	Copyright of Behaviour is the property of Brill Academic Publishers and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database:	Psychology and Behavioral Sciences Collection

Description
Abstract:	This study examined cortisol release into the water by European sea bass, Dicentrarchus labrax. The time-course of plasma and water cortisol concentrations were determined in adult fish subjected to acute stress, by sampling blood and water at 0 h (before stress) and 0.5, 1, 2, 4, 8 and 24 h after stress. Sea bass showed a typical stress response, with plasma glucose and lactate concentrations peaking at 2 h, and plasma cortisol levels peaking at 1 h. Cortisol release rate into the water increased in response to stress and was positively correlated with plasma cortisol concentrations. In a further trial, juvenile fish were confined at densities of 20 and 50 kg/m3 and water cortisol was evaluated over a 24 h period. Cortisol release rates peaked between 0–1 h in the high and 1–2 h in the low density group. In conclusion, these results provide strong evidence that cortisol release rate into the water can be used as a non-invasive method for the assessment of the stress response and that although sea bass presents a high blood stress response after exposure to acute husbandry stressors, it is releasing less cortisol into the water compared to other species previously examined. [ABSTRACT FROM AUTHOR]
ISSN:	00057959
DOI:	10.1163/156853908785765818