Fish are now widely recognised to be sentient animals. Good welfare practices are therefore not only ethical, but they also are demonstrated to improve fish quality and may even drive consumer choice. A critical point in the life of a captive fish is the final stages of their production. Not only this moment has the risk of dramatically affecting the welfare of the individuals, but it can also cause serious economic impacts to the farm, since the slaughter process can affect meat quality and carcass appearance. In this experiment we tested a newly devised temperature stunner, in which the fish were immersed in water that achieves water temperatures of -8ºC still in liquid state. The objective was to evaluate and compare the effectiveness and welfare effects of four types of stunning methods in rainbow trout O. mykiss: cold shock by fast-chilling (FC) as a novel method, asphyxia (ASP) as the current method, electrical stunning (ES) as a humane method, and anaesthesia with MS-222 (AN) as a positive control. We used a multi-level approach to address the welfare of 176 juvenile trout, combining behaviour (individual swimming activity, equilibrium, opercular movement and eye-roll), physiology (heart rate and amplitude of electrocardiogram signal) and stress biomarkers (plasma cortisol and osmolality), and proteomics. We then proceeded to analyse the effects on shelf-life fillet and quality of fish subjected to each of these methods, using a wide range of indicators (namely rigor mortis, water content, fillet colour, pH and ATP degradation).
ASSESSING RAINBOW TROUT WELFARE AT SLAUGHTER: AN INTEGRATIVE APPROACH USING BEHAVIOURAL, PHYSIOLOGICAL, PROTEOMIC AND QUALITY INDICATORS WITH A NOVEL TEMPERATURE STUNNING METHOD / Saraiva J., Faccenda F., Cabrera-Álvarez M.J. Povinelli M., Hubbard P.C, Cerqueira M., Farinha A., Secci G., Tignani M.V. , & Parisi G.. - ELETTRONICO. - (2023), pp. 1310-1311. (Intervento presentato al convegno Aquaculture Europe 2023 Balanced Diversity in Aquaculture Development tenutosi a Vienna nel 18-21 settembre).
ASSESSING RAINBOW TROUT WELFARE AT SLAUGHTER: AN INTEGRATIVE APPROACH USING BEHAVIOURAL, PHYSIOLOGICAL, PROTEOMIC AND QUALITY INDICATORS WITH A NOVEL TEMPERATURE STUNNING METHOD
Secci G.;Tignani M. V.;Parisi G.
2023
Abstract
Fish are now widely recognised to be sentient animals. Good welfare practices are therefore not only ethical, but they also are demonstrated to improve fish quality and may even drive consumer choice. A critical point in the life of a captive fish is the final stages of their production. Not only this moment has the risk of dramatically affecting the welfare of the individuals, but it can also cause serious economic impacts to the farm, since the slaughter process can affect meat quality and carcass appearance. In this experiment we tested a newly devised temperature stunner, in which the fish were immersed in water that achieves water temperatures of -8ºC still in liquid state. The objective was to evaluate and compare the effectiveness and welfare effects of four types of stunning methods in rainbow trout O. mykiss: cold shock by fast-chilling (FC) as a novel method, asphyxia (ASP) as the current method, electrical stunning (ES) as a humane method, and anaesthesia with MS-222 (AN) as a positive control. We used a multi-level approach to address the welfare of 176 juvenile trout, combining behaviour (individual swimming activity, equilibrium, opercular movement and eye-roll), physiology (heart rate and amplitude of electrocardiogram signal) and stress biomarkers (plasma cortisol and osmolality), and proteomics. We then proceeded to analyse the effects on shelf-life fillet and quality of fish subjected to each of these methods, using a wide range of indicators (namely rigor mortis, water content, fillet colour, pH and ATP degradation).
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