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Memorias de investigación
Communications at congresses:
How does fasting before slaughter affect trout (Oncorhynchus mykiss) welfare?
Year:2012
Research Areas
  • Aquaculture
Information
Abstract
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.
International
Si
Congress
International Conference of Agricultural Engineering
960
Place
Valencia
Reviewers
Si
ISBN/ISSN
978-84-615-9928-8
Start Date
08/07/2012
End Date
12/07/2012
From page
7
To page
7
International Conference of Agricultural Engineering. Agriculture and Egineering for a Healthier Life. Book of Abstracts
Participants
  • Autor: Javier López Luna (UPM)
  • Autor: Morris Ricardo Villarroel Robinson (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Producción Animal
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