Abstract
Repetitive aquaculture-related protocols may act as cyclic stressors that induce chronic stress in cultured fish. The sea bass is particularly sensitive to stressful conditions and the mere presence of humans will disturb feeding behavior. In this paper, we study whether chronic stress induced by repetition of acute stress protocols affects long-term feeding behavior and growth performance in sea bass and whether exogenous cortisol may induce stress-like changes in these parameters. We demonstrate that both chronic stress and dietary cortisol decrease food intake and have a negative effect on feed conversion efficiency, severely impairing sea bass performance. Both experimental approaches induced changes in the daily feeding activity by lengthening the active feeding periods. Fish subjected to a cyclic stressor modify their daily feeding pattern in an attempt to avoid interference with the time of the stressor. The delay in feeding when fish are acutely and repeatedly stressed could be of substantial adaptive importance.
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Acknowledgments
This work was supported by grants AGL2007-65744-C03-02, AGL2010-22247-C03-01 and CSD 2007-00002 from Spanish Science and Education Ministry (MEC) to JMC-R. Additional funding was obtained from the “Generalitat Valenciana” (research grant PROMETEO 2010/006). EL was recipient of a Geronimo Forteza fellowship from the Generalitat Valenciana (GV). The authors wish to acknowledge TINAMENOR for supplying the experimental animals. We also thank Matias Sánchez for his technical assistance in fish maintenance and cleaning protocols.
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Communicated by G. Heldmaier.
E. Leal and B. Fernández-Durán contributed equally to this work.
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Leal, E., Fernández-Durán, B., Guillot, R. et al. Stress-induced effects on feeding behavior and growth performance of the sea bass (Dicentrarchus labrax): a self-feeding approach. J Comp Physiol B 181, 1035–1044 (2011). https://doi.org/10.1007/s00360-011-0585-z
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DOI: https://doi.org/10.1007/s00360-011-0585-z