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Descripción
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| Fasting fish before slaughter is a common practise in aquaculture but it is not clear how long rainbow trout can be or should be starved pre-slaughter, before suffering unnecessary stress nor at what moment of the day is the most appropriate. We fasted 90 rainbow trout (Oncorhynchus mykiss) for 24, 48 and 72 hours (11.3, 22.9 and 35.2ºC days) and slaughtered them in the morning (08h00), afternoon (14h00) and night (20h00) to observe the effect of fasting duration and slaughter time on welfare indicators, including hematocrit, leucocyte count, plasma cortisol, glucose and lactate concentrations. The values of the fasted fish were compared to control fish kept under similar conditions but not fasted. Water temperature averaged 12.0±1.8ºC (range: 10.7-13.2ºC). Body measurements were not highly influenced by fasting, although higher coefficients of condition on the first day after cessation of feeding were observed (0.97-1.00). Cortisol and lactate levels were very high in fasted and control groups probably due to exogenous environmental factors. The rest of blood indicators were within normal ranges and had not a big impact on welfare. The results suggest that trout can cope with fasting up to 3 days (35.2ºC days) with little apparent effect on their welfare compared to control fish. | |
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Internacional
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Si |
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Nombre congreso
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International Conference of Agricultural Engineering |
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Tipo de participación
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960 |
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Lugar del congreso
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Valencia |
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Revisores
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Si |
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ISBN o ISSN
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978-84-615-9928-8 |
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DOI
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Fecha inicio congreso
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08/07/2012 |
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Fecha fin congreso
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12/07/2012 |
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Desde la página
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7 |
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Hasta la página
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7 |
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Título de las actas
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International Conference of Agricultural Engineering. Agriculture and Egineering for a Healthier Life. Book of Abstracts |