Document Detail

Effectiveness of the anaesthetic MS-222 in gilthead seabream, Sparus aurata: effect of feeding time and day-night variations in plasma MS-222 concentration and gst activity.
MedLine Citation:
PMID:  23291569     Owner:  NLM     Status:  Publisher    
Feeding time is a potent zeitgeber capable of synchronizing behavioural and physiological daily rhythms in fish. However, the effect of feeding time on the daily rhythm of drugs toxicity and/or effectiveness remains unexplored to date. In this paper we investigated the day/night variations in the effectiveness of an anaesthetic commonly used in fish (Tricaine, MS-222) in a teleost of great chronobiological and aquaculture interest (gilthead seabream). To this end, fish were kept under LD 12:12 and fed at mid-light (ML), mid-darkness (MD) or random times (RD). The time needed to induce anaesthesia (reduction of locomotor activity) during MS-222 exposure (65mg/L) as well as the recovery period were investigated at ML and MD in the three experimental groups using specialised video tracking software. In addition, daily rhythms of GST activity in the liver (as an indicator of detoxification processes) and plasma MS-222 concentration (related to uptake) were determined. The results revealed that MS-222 effectiveness in the ML group was higher during the day than at night (significant reduction of activity after 3min vs 5min) whereas in the MD group the daily variation of MS-222 effectiveness was inverted (significant reduction of activity after 7min at ML vs 2min at MD), suggesting that feeding time can shift the day-night variations in the effectiveness of MS-222. Hepatic GST also seemed to be affected by feeding time: in fish fed at MD or RD this enzyme activity showed significant differences during the day, and the highest levels were found at different times of the day in each group. Plasma MS-222 concentrations were higher at ML (142.4±12.8ng/ml) than at MD (96.3±10.9ng/ml) (t-Student, p<0.05). These results suggest that the daily variation in MS-222 concentration following exposure might be involved, among other factors, in the existence of day-night variations in the effectiveness of this anaesthetic. Furthermore, manipulation of the feeding schedule can be used to modify the daily variations in MS-222 effectiveness, which has basic as well applied implications for optimising anaesthesia protocols in fish aquaculture.
L M Vera; A Montoya; F J Sánchez-Vázquez
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-2
Journal Detail:
Title:  Physiology & behavior     Volume:  -     ISSN:  1873-507X     ISO Abbreviation:  Physiol. Behav.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-7     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0151504     Medline TA:  Physiol Behav     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012. Published by Elsevier Inc.
Department of Physiology, Faculty of Biology, Regional Campus of International Excellence "Campus Mare Nostrum", University of Murcia, 30100, Spain. Electronic address:
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