Environmental blue light prevents stress in the fish Nile tilapia
Braz. j. med. biol. res
;
34(8): 1041-1045, Aug. 2001. ilus, tab
Artigo
em Inglês
| LILACS
| ID: lil-290154
ABSTRACT
The present study aimed to test the effects of blue, green or white light on the stress response of the Nile tilapia, Oreochromis niloticus (L.). Each color was tested on two groups of isolated adult Nile tilapia (8 replicates each) one being subjected to confinement stress, and the other not (control). A different environmental color was imposed on each compartment by covering the light source with cellophane of the respective color (green or blue; no cellophane was used for white light). The intensity of green, white and blue lights was 250, 590 and 250 lux, respectively. Basal plasma cortisol levels were determined for each fish prior to the experimental procedures. The fish were confined by being displaced toward one side of the aquarium using an opaque partition for 1 h both in the morning and the afternoon of the two consecutive days of the test. At the end of this 48-h period, plasma cortisol levels were measured again. Basal cortisol levels (ng/ml) were similar for each group (ANOVA, F(2;42) = 0.77, P = 0.47). Thus, plasma cortisol levels were analyzed in terms of variation from their respective basal level. After confinement, plasma cortisol levels were not increased in fish submitted to a blue light environment. Thus, blue light prevents the confinement-induced cortisol response, an effect not necessarily related to light intensity
Texto completo:
DisponíveL
Índice:
LILACS (Américas)
Assunto principal:
Estresse Psicológico
/
Tilápia
/
Cor
/
Ambiente Controlado
/
Luz
Limite:
Animais
Idioma:
Inglês
Revista:
Braz. j. med. biol. res
Assunto da revista:
Biologia
/
Medicina
Ano de publicação:
2001
Tipo de documento:
Artigo
/
Congresso e conferência
País de afiliação:
Brasil
Instituição/País de afiliação:
Universidade Estadual Paulista/BR
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