Differences between male and female growth and sexual maturation in tilapia (oreochromis mossambicus)

Abstract

In tilapia, growth during critical periods of the life cycle varies at different ages of development and is influenced by sexual maturation. The mechanisms controlling gametogenesis and how growth affects this process are poorly understood. This study indicates that tilapia exhibit a sexually dimorphic growth pattern in which males grow faster and bigger than females. During critical periods of development growth patterns of tilapia vary between males and females as they increase in age and sexual maturation. In this study interactions between growth and reproductive development were examined by monitoring and comparing growth rates and reproductive histology. Female growth rate peaked at the very early stages of reproductive development during the cortical alveolar stages and male growth rate peaked after complete sexual maturation during spermiogenesis. The accumulation of cortical alveoli in the oocyte in females and spermiogenesis in males was determined to be the critical developmental periods of tilapia effecting growth rates.

<b>Genotype by sex interaction at different phases during Nile tilapia culture period

“…Moreover, rates lower than 0.32 were reported for phenotypic correlations (Table 6). Reduction behavior of phenotypic correlations and phenotypic ratios owing to the aging of the animals indicate that the prolongation of the culture period enhances phenotypic differences between males and females, with an underscoring of sexual dimorphism as previously reported by Bhatta et al (2013); Oliveira et al (2013), Lind et al (2015). Table 6.…”

Hormonal Profile and Reproductive Parameters of Pre-vitellogenic Mozambique tilapia (Oreochromis mossambicus) on Pawpaw (Carica papaya) Seed Meal

“…The GSI of male O. mossambicus varies between 0.35 to 0.92% (Shubha & Reddy, 2011). According to Bhatta et al (2012) male O. mossambicus usually have their highest GSI of up to 1% of the body weight during the spawning season. In the males, there was no significant difference in the end point indicators of reproductive impairment, GSI and gonad weight recorded in this study.…”

PERBAIKAN PERTUMBUHAN DAN TOLERANSI SALINITAS IKAN NILA SRIKANDI (Oreochromis aureus x O. niloticus) MELALUI HIBRIDISASI DAN BACK-CROSS DENGAN O. aureus F-1 DI KARAMBA JARING APUNG LAUT

“…Puncak laju pertumbuhan pada ikan nila berbeda antara jantan dan betina. Puncak laju pertumbuhan ikan betina terjadi pada tahap awal pembentukan gonad, sedangkan pada ikan jantan terjadi pada tahap maturasi gonad lengkap selama tahap spermiogenesis (Bhatta et al, 2012). Titik puncak di mana kurva sudah mulai mendatar biasanya dijadikan acuan untuk panen.…”