Till sidans topp

Sidansvarig: Webbredaktion
Sidan uppdaterades: 2012-09-11 15:12

Tipsa en vän
Utskriftsversion

Stunning fish with CO2 or… - Göteborgs universitet Till startsida
Webbkarta
Till innehåll Läs mer om hur kakor används på gu.se

Stunning fish with CO2 or electricity: contradictory results on behavioural and physiological stress responses

Artikel i vetenskaplig tidskrift
Författare Albin Gräns
Lars Niklasson
Erik Sandblom
Kristina Sundell
Bo Algers
Lotta Berg
Torbjörn Lundh
Michael Axelsson
Henrik Sundh
Anders Kiessling
Publicerad i Animal
Volym 10
Nummer/häfte 2
Sidor 294-301
ISSN 1751-7311
Publiceringsår 2016
Publicerad vid Institutionen för biologi och miljövetenskap
Sidor 294-301
Språk en
Länkar dx.doi.org/10.1017/S175173111500075...
Ämnesord aquaculture; narcosis; slaughter; teleost; welfare
Ämneskategorier Zoofysiologi, Fisk- och akvakulturforskning

Sammanfattning

Studies that address fi sh welfare before slaughter have concluded that many of the traditional systems used to stun fi sh including CO 2 narcosis are unacceptable as they cause avoidable stress before death. One system recommended as a better alternative is electrical stunning, however, the welfare aspects of this method are not yet fully understood. To assess welfare in aquaculture both behavioural and physiological measurements have been used, but few studies have examined the relationship between these variables. In an on-site study aversive behaviours and several physiological stress indicators, including plasma levels of cortisol and ions as well as blood physiological variables, were compared in Arctic char ( Salvelinus alpinus ) stunned with CO 2 or electricity. Exposure to water saturated with CO 2 triggered aversive struggling and escape responses for several minutes before immobilization, whereas in fi sh exposed to an electric current immobilization was close to instant. On average, it took 5 min for the fi sh to recover from electrical stunning, whereas fi sh stunned with CO 2 did not recover. Despite this, the electrically stunned fi sh had more than double the plasma levels of cortisol compared with fi sh stunned with CO 2 . This result is surprising considering that the behavioural reactions were much more pronounced following CO 2 exposure. These contradictory results are discussed with regard to animal welfare and stress physiological responses. The present results emphasise the importance of using an integrative and interdisciplinary approach and to include both behavioural and physiological stress indicators in order to make accurate welfare assessments of fish in aquaculture.

Sidansvarig: Webbredaktion|Sidan uppdaterades: 2012-09-11
Dela:

På Göteborgs universitet använder vi kakor (cookies) för att webbplatsen ska fungera på ett bra sätt för dig. Genom att surfa vidare godkänner du att vi använder kakor.  Vad är kakor?