Conditioning of stress in Nile tilapia


Autoria(s): Moreira, PSA; Volpato, G. L.
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

20/05/2014

20/05/2014

01/04/2004

Resumo

A Pavlovian conditioning paradigm was used to induce a connection between a conditioned stimulus, light (CS), associated with an unconditioned stimulus, confinement (US) in Nile tilapia Oreochromis niloticus, which resulted in a conditioned endocrine response (CR) to the CS alone manifested as an increase in plasma cortisol. Individual isolated Nile tilapia were submitted for 10 days to the conditioning treatment consisting of turning on a light (CS) for I min with subsequent 30 min confinement (US). on the 10th day of the experiment, plasma cortisol was not increased when fish were subjected to no handling at all, or only light, or even a daily stressor for the 9 days. on the other hand, at the 10th day cortisol was significantly increased only when light was presented either with or without pairing with the stressor. These results confirmed that the cue, light (CS), was not stressful in itself, but when given as the CS in the absence of the US post conditioning the hypothalamus-pituitary-interrenal axis was activated. Therefore, it was concluded that memory of a previous experience with a stressor can be recalled by a conditioned stimulus and induce stress, which is the first demonstration of a memory-induced stress in fishes. (C) 2004 the Fisheries Society of the British Isles.

Formato

961-969

Identificador

http://dx.doi.org/10.1111/j.1095-8649.2004.00362.x

Journal of Fish Biology. Oxford: Blackwell Publishing Ltd, v. 64, n. 4, p. 961-969, 2004.

0022-1112

http://hdl.handle.net/11449/17759

10.1111/j.1095-8649.2004.00362.x

WOS:000220878400013

Idioma(s)

eng

Publicador

Blackwell Publishing

Relação

Journal of Fish Biology

Direitos

closedAccess

Palavras-Chave #animal welfare #cortisol #memory #Nile tilapia #Pavlovian conditioning
Tipo

info:eu-repo/semantics/article