Inmersión de ovas de tilapia roja (Oreochromis spp.) en diferentes estadíos de fertilización en una solución de 17α metiltestosterona y la proporción fenotípica del sexo

ABSTRACT: This study evaluated the proportions of sex reversals which occurred after red tilapia (Oreochromis spp.) eggs were immersed into various solutions of 17α-Methyltestosterone (0, 800 and 1200 µg/L of water). Two fertilization stages of the eggs, i.e., reflecting clear or dark colors, were included in this study. Besides sex proportions, other parameters studied included hatching, fry and fingerling survival, final weight and length. There were no significant differences between the sex proportions obtained relative to hormone concentration or egg color (49.59% males from dark eggs and 46.36% males from light eggs versus the control, which had 55.24% males). In contrast, the percentage of hatching was significantly higher in dark eggs (60.27% ± 11.52). Survival of fry was higher when born from dark eggs compared with clear eggs (51.74% ± 27.01 versus 28.97% ± 1.52, respectively). Fingerling survival was not related to the color of the eggs (59.28% ± 23.73 versus 65.58% ± 9.01 for initially dark and clear eggs, respectively). However, surviving males were longer and heavier (6.75 cm ± 1.29 and 5.45 g ± 3.09) than females. This data suggest a possible interaction between hatching, survival, and egg color.

• Autores: Botero Aguirre, Mónica Cecilia; Pineda, Juan Carlos; Gallego, Natalia
• Tipo de recurso: Article of investigation
• Fecha de publicación: 2011
• Institución: Universidad de Antioquia
• Repositorio: Repositorio UdeA
• Idioma: spa
• OAI Identifier: oai:bibliotecadigital.udea.edu.co:10495/8344
• Acceso en línea: http://hdl.handle.net/10495/8344
• Rights: openAccess
• License: Atribución-NoComercial-CompartirIgual 2.5 Colombia (CC BY-NC-SA 2.5 CO)