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Visual communication stimulates reproduction in Nile tilapia, Oreochromis niloticus (L. )
Castro, A. L. S; Gonçalves-de-Freitas, E; Volpato, G. L; Oliveira, C.
Afiliación
  • Castro, A. L. S; Universidade Estadual Paulista. Centro de Aquicultura. BR
  • Gonçalves-de-Freitas, E; Universidade Estadual Paulista. Centro de Aquicultura. BR
  • Volpato, G. L; Universidade Estadual Paulista. Centro de Aquicultura. BR
  • Oliveira, C; Universidade Estadual Paulista. Centro de Aquicultura. BR
Braz. j. med. biol. res ; 42(4): 368-374, Apr. 2009. graf, tab
Article en En | LILACS | ID: lil-509165
Biblioteca responsable: BR1.1
ABSTRACT
Reproductive fish behavior is affected by male-female interactions that stimulate physiological responses such as hormonal release and gonad development. During male-female interactions, visual and chemical communication can modulate fish reproduction. The aim of the present study was to test the effect of visual and chemical male-female interaction on the gonad development and reproductive behavior of the cichlid fish Nile tilapia, Oreochromis niloticus (L.). Fifty-six pairs were studied after being maintained for 5 days under one of the four conditions (N = 14 for each condition) 1) visual contact (V); 2) chemical contact (Ch); 3) chemical and visual contact (Ch+V); 4) no sensory contact (Iso) - males and females isolated. We compared the reproductive behavior (nesting, courtship and spawning) and gonadosomatic index (GSI) of pairs of fish under all four conditions. Visual communication enhanced the frequency of courtship in males (mean ± SEM; V 24.79 ± 3.30, Ch+V 20.74 ± 3.09, Ch 0.1 ± 0.07, Iso 4.68 ± 1.26 events/30 min; P < 0.05, two-way ANOVA with LSD post hoc test), induced spawning in females (3 spawning in V and also 3 in Ch+V condition), and increased GSI in males (mean ± SEM; V 1.39 ± 0.08, Ch+V 1.21 ± 0.08, Ch 1.04 ± 0.07, Iso 0.82 ± 0.07 percent; P < 0.05, two-way ANOVA with LSD post hoc test). Chemical communication did not affect the reproductive behavior of pairs nor did it enhance the effects of visual contact. Therefore, male-female visual communication is an effective cue, which stimulates reproduction among pairs of Nile tilapia.
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Texto completo: 1 Colección: 01-internacional Base de datos: LILACS Asunto principal: Reproducción / Comunicación Animal / Cortejo / Cíclidos / Gónadas Límite: Animals Idioma: En Revista: Braz. j. med. biol. res Asunto de la revista: BIOLOGIA / MEDICINA Año: 2009 Tipo del documento: Article / Project document País de afiliación: Brasil Pais de publicación: Brasil
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: LILACS Asunto principal: Reproducción / Comunicación Animal / Cortejo / Cíclidos / Gónadas Límite: Animals Idioma: En Revista: Braz. j. med. biol. res Asunto de la revista: BIOLOGIA / MEDICINA Año: 2009 Tipo del documento: Article / Project document País de afiliación: Brasil Pais de publicación: Brasil