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Eye color as an indicator of social rank in the fish Nile tilapia
Volpato, G. L; Luchiari, A. C; Duarte, C. R. A; Barreto, R. E; Ramanzini, G. C.
  • Volpato, G. L; Universidade Estadual Paulista. Instituto de Biociências. Departamento de Fisiologia. Research Center on Animal Welfare - RECAW, Laboratório de Fisiologia e Comportamento Animal. Botucatu. BR
  • Luchiari, A. C; Universidade Estadual Paulista. Instituto de Biociências. Departamento de Fisiologia. Research Center on Animal Welfare - RECAW, Laboratório de Fisiologia e Comportamento Animal. Botucatu. BR
  • Duarte, C. R. A; Universidade Estadual Paulista. Instituto de Biociências. Departamento de Fisiologia. Research Center on Animal Welfare - RECAW, Laboratório de Fisiologia e Comportamento Animal. Botucatu. BR
  • Barreto, R. E; Universidade Estadual Paulista. Instituto de Biociências. Departamento de Fisiologia. Research Center on Animal Welfare - RECAW, Laboratório de Fisiologia e Comportamento Animal. Botucatu. BR
  • Ramanzini, G. C; Universidade Estadual Paulista. Instituto de Biociências. Departamento de Fisiologia. Research Center on Animal Welfare - RECAW, Laboratório de Fisiologia e Comportamento Animal. Botucatu. BR
Braz. j. med. biol. res ; 36(12): 1659-1663, Dec. 2003. ilus
Artículo en Inglés | LILACS | ID: lil-350463
ABSTRACT
We investigated the association of eye color with the dominant-subordinate relationship in the fish Nile tilapia, Oreochromis niloticus. Eye color pattern was also examined in relation to the intensity of attacks. We paired 20 size-matched fish (intruder 73.69 ± 11.49 g; resident 75.42 ± 8.83 g) and evaluated eye color and fights. These fish were isolated in individual aquaria for 10 days and then their eye color was measured 5 min before pairing (basal values). Twenty minutes after pairing, eye color and fights were quantified for 10 min. Clear establishment of social hierarchy was observed in 7 of 10 pairs of fish. Number of attacks ranged from 1 to 168 among pairs. The quartile was calculated for these data and the pairs were then divided into two classes low-attack (1 to 111 attacks - 2 lower quartiles) or high-attack (112 to 168 attacks - 2 higher quartiles). Dominance decreased the eye-darkening patterns of the fish after pairing, while subordinance increased darkening compared to dominance. Subordinate fish in low-attack confrontations presented a darker eye compared to dominant fish and to the basal condition. We also observed a paler eye pattern in dominants that shared low-attack interactions after pairing compared to the subordinates and within the group. However, we found no differences in the darkening pattern between dominants and subordinates from the high-attack groups. We conclude that eye color is associated with social rank in this species. Moreover, the association between eye color and social rank in the low-attack pairs may function to reduce aggression.
Asunto(s)
Texto completo: Disponible Índice: LILACS (Américas) Asunto principal: Conducta Animal / Color del Ojo / Tilapia / Jerarquia Social Límite: Animales Idioma: Inglés Revista: Braz. j. med. biol. res Asunto de la revista: Biologia / Medicina Año: 2003 Tipo del documento: Artículo / Congreso y conferencia País de afiliación: Brasil Institución/País de afiliación: Universidade Estadual Paulista/BR

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Texto completo: Disponible Índice: LILACS (Américas) Asunto principal: Conducta Animal / Color del Ojo / Tilapia / Jerarquia Social Límite: Animales Idioma: Inglés Revista: Braz. j. med. biol. res Asunto de la revista: Biologia / Medicina Año: 2003 Tipo del documento: Artículo / Congreso y conferencia País de afiliación: Brasil Institución/País de afiliación: Universidade Estadual Paulista/BR