Aspectos reproductivos de la mojarra rallada (Gerres cinereus) en el sector de Puerto Hondo, Estero Salado de Guayaquil (Guayas - Ecuador) en el periodo abril - agosto 2018
Fecha
2019
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Facultad de Ciencias Naturales. Universidad de Guayaquil
Resumen
Se colectaron 231 individuos de Gerres cinereus (mojarra rayada) desde abril hasta agosto del 2018 en el Estero Salado de Guayaquil. Se determinó el tipo de crecimiento, talla de primera madurez sexual (L50) y proporción sexual. La relación longitud-peso fue establecida por la ecuación Pt = 0,016 Lt2,88; r = 0,97, lo cual refleja que el crecimiento es de tipo isométrico; adicionalmente, la prueba t Student mostró que no existen diferencias entre sexos (p= 0,1). El L50 obtenido para hembras fue 14,4 cm; mientras que, para machos la talla de primera madurez sexual fue mayor con 16,6 cm Lt, lo cual indica que los machos tienen una maduración tardía en comparación a las hembras. La proporción sexual obtenida fue de 1,36:1 (Hembras: Machos), donde las hembras significaron el 58% de la captura total y los machos el 42% restante, indicando que las hembras son más susceptibles a ser capturadas en esta zona; la alta incidencia de hembras podría estar relacionada al comportamiento sexual o migraciones ontogénicas de esta especie. Así mismo, el presente estudio encontró que gran parte de los individuos capturados presentaron tallas inferiores a la determinada en el L50, lo cual sugiere una sobreexplotación del recurso en el Estero Salado.
A total of 231 individuals of Gerres cinereus (mojarra) were collected during April - August 2018 in Estero Salado of Guayaquil. Type of growth, size of first sexual maturity (L50) and sex ratio were determined. The length-weight relationship was established by the equation Pt = 0.016 Lt2,88; r = 0.97, which indicates an isometric growth type. In addition, t Student test showed there were no significant differences between sexes (p = 0.1). The L50 obtained for females was 14.4 cm; whereas, for males, the first sexual maturity size was greater with 16.6 cm Lt, which indicates that males have a late maturation in comparison to females. The sex ratio obtained was 1.36: 1 (Females: Males), where females represented 58% of the total catch, while males corresponded 42%. This might suggest that females are more susceptible to being caught within this area; the high incidence of females could be related to sexual behavior or ontogenetic migrations of this species. Furthermore, a large part of the individuals caught showed sizes under the L50 determined in this study, which suggests an overexploitation of the resource in Estero Salado.
A total of 231 individuals of Gerres cinereus (mojarra) were collected during April - August 2018 in Estero Salado of Guayaquil. Type of growth, size of first sexual maturity (L50) and sex ratio were determined. The length-weight relationship was established by the equation Pt = 0.016 Lt2,88; r = 0.97, which indicates an isometric growth type. In addition, t Student test showed there were no significant differences between sexes (p = 0.1). The L50 obtained for females was 14.4 cm; whereas, for males, the first sexual maturity size was greater with 16.6 cm Lt, which indicates that males have a late maturation in comparison to females. The sex ratio obtained was 1.36: 1 (Females: Males), where females represented 58% of the total catch, while males corresponded 42%. This might suggest that females are more susceptible to being caught within this area; the high incidence of females could be related to sexual behavior or ontogenetic migrations of this species. Furthermore, a large part of the individuals caught showed sizes under the L50 determined in this study, which suggests an overexploitation of the resource in Estero Salado.
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GERRES CINEREUS, PROPORCIÓN SEXUAL, MADUREZ SEXUAL, CRECIMIENTO ISOMÉTRICO