Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 421811
Title Physiological and behavioral responses to an electrical stimulus in Mozambique tilapia (Oreochromis mossambicus)
Author(s) Roques, J.A.C.; Abbink, W.; Chereau, G.; Fourneyron, A.; Spanings, T.; Burggraaf, D.; Bos, R. van de; Vis, J.W. van de; Flik, G.
Source Fish Physiology and Biochemistry 38 (2012)4. - ISSN 0920-1742 - p. 1019 - 1028.
Department(s) IMARES Aquaculture
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) pain perception - rainbow-trout - na+/k+-atpase - common carp - fish - welfare - stress - evolution - cells - water
Abstract Consumer awareness of the need to improve fish welfare is increasing. Electrostunning is a clean and potentially efficient procedure more and more used to provoke loss of consciousness prior to killing or slaughtering (reviewed by Van de Vis et al. in Aquac Res 34:211–220, 2003). Little is known how (powerful) electrical stimuli, which do not stun immediately, are perceived by fish. We investigated responses of hand-held Mozambique tilapia (Oreochromis mossambicus) to a standardized electric shock applied to the tailfin. The handling with the resulting unavoidable acute stress response was carefully controlled for. Fish responses were analyzed up to 24 h following the shock. Electric shock resulted in slightly higher levels in plasma cortisol, lactate, ionic levels, and osmolality, than handling alone. Plasma glucose had significantly increased 6 h after shock compared to handling, indicative of enhanced adrenergic activity. Mucus release from the gills, branchial Na+/K+ ATPase activity, and chloride cell migration and proliferation, parameters that will change with strong adrenergic activation, were not affected. Decreased swimming activity and delay in resumption of chafing behavior indicated a stronger and differential response toward the electric shock. Responses to handling lasted shorter compared to those to an electric shock. The differential and stronger responses to the electric shock suggest that fish perceived the shock potentially as painful.
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