Retardation of ovarian growth and depression of serum steroid levels in the tilapia, Oreochromis mossambicus, by cortisol implantation
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Understanding the impact of stress on teleostean reproduction
2022, Aquaculture and FisheriesCitation Excerpt :Further, confinement in Acanthopagrus butcheri caused elevated cortisol levels with decreased sex hormone levels to prove that stress causes a rapid change in the levels of hormones and inhibition of gonadal steroidogenesis which eventually disrupts reproduction (Haddy & Pankhurst, 1999). Stress induction in Oreochromis mossambicus triggered serum cortisol and decreased E2 levels which further inhibited the recruitment of preovulatory follicles leads to the interruption of spawning (Foo & Lam, 1993). In another study, repeated acute stress for nine months before spawning showed a significant delay in ovulation and reduced egg size, while in males, lowered sperm counts (Rurangwa et al., 2004).
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2019, Science of the Total EnvironmentCitation Excerpt :Variation in size structure can partially be explained by cortisol levels. Implanted cortisol has been shown to suppress ovarian growth in adult tilapia experiencing chronic stress (Foo and Lam, 1993) and guppies under prolonged stress showed also reduced oocyte sizes (Dahlgren, 1979). Cortisol was elevated in fish in the HT and in the K group, but oocyte size in HT was reduced compared to K.
Distinguishing between endocrine disruption and non-specific effects on endocrine systems
2018, Regulatory Toxicology and PharmacologyCitation Excerpt :Stress can lead to increased synthesis of cortisol, and cortisol can act as an inhibitory hormone of both male and female fish reproductive physiology over the whole reproductive cycle (Milla et al., 2010). Cortisol can lower sex steroid levels, leading to decreased gonado-somatic index (GSI), decreased Vtg levels and decreased secondary sex characteristics (tubercle score) (Foo and Lam, 1993; Carragher and Sumpter, 1990; Aluru and Vijayan, 2009; Milla et al., 2010; Pankhurst and Van der Kraak, 2000; Haddy and Pankhurst, 1999; Wu et al., 2003; Lethimonier et al., 2000). These results have been confirmed using in vivo studies of fish exposed to confinement stress (Pankhurst and Van der Kraak, 2000) or implanted with cortisol (Foo and Lam, 1993) leading to reduced sex hormone levels.
Reproduction and Development
2016, Fish Physiology