Sex determination in Nile tilapia, Oreochromis niloticus: Effect of high temperature during embryogenesis on sex ratio and sex differentiation pathway

Rougeot, Carole; Prignon, Christian; Kanfitine, Samane Yadja; Kengne, Cyrille Valence Ngouana; Mélard, Charles

doi:10.1016/j.aquaculture.2007.07.176

Cited by 2 publications

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“…From each aquarium, fish were transferred into larger tanks (150 L) and held at 28 o C to promote growth. When juveniles reached at age of 3 months, they were removed for sexing (genital papilla) (Rougeot et al, 2007 and.…”

Section: Methodsmentioning

confidence: 99%

EFFECT OF DIFFERENT TEMPERATURES ON GROWTH AND SEX RATIO OF NILE TILAPIA (Oreochromis niloticus) FRY

Ali

2009

Journal of Animal and Poultry Production

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The present study was carried out at Fish Research Center (FRC), Suez Canal University, Ismailia, Egypt, in two consecutive experiments. First experiment, was conducted to determine the effect of different water temperatures on growth performance of Nile tilapia (Oreochromis niloticus) fry. Second experiment, was carried out to study the effect of different water temperatures on sex ratio of progenies of Nile tilapia (Oreochromis niloticus), during their early life stages. In experimental 1, twenty-day-old Nile tilapia fry, weighing 0.30±0.03g, were distributed at a density of 30 fry per 45-L fiberglass aquarium for 60 days on four thermal regimes (20, 25, 30, and 35 o C) three replicate for each. The physico-chemical parameters of water in all aquaria were recorded. Fish were fed three times daily using a commercial diet containing 46% protein at a rate of 12% of body weight/day. Growth performance was estimated throughout the experiment. Results showed that the final mean weight was significantly higher at 25 and 30 o C than at 20 and 35 o C. Daily weight gain (DWG) and feed conversion ration (FCR) were better at 25 and 30 o C. At all temperatures, survival rates were not affected.. In experiment 2, Nile tilapia fry (first 20 days after yolk sac resorption) were distributed at a density of 100 fry per 45-L fiberglass aquarium for 28 days in four different temperature regimes (22, 27, 32, and 37 o C), three replicate for each. Results showed that the high temperature (37 o C) treatment produced a significantly higher proportion of males (89%) with low survival rates (79%). Whereas the sex ratio of progenies reared at temperature below 37 o C never deviated significantly from the balanced sex ratio. The study suggested that the best growth and feed utilization of O. niloticus juveniles may be higher at 25 and 30 o C and it is possible for producing higher males (sex ratio) population of Nile tilapia by thermal sex reversal.

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Section: Methodsmentioning

confidence: 99%

EFFECT OF DIFFERENT TEMPERATURES ON GROWTH AND SEX RATIO OF NILE TILAPIA (Oreochromis niloticus) FRY

Ali

2009

Journal of Animal and Poultry Production

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“…for a recent review on the effects of endocrine disrupters. References: 1 (Davey & Jellyman 2005); 2 (Nusslein-Volhard & Dahm 2002); 3 (Patino et al 1996); 4 (Magerhans et al 2009); 5 (Conover & Kynard 1981); 6 (Selim et al 2009); 7 (Baron et al 2002); 8(Bezault et al 2007;Rougeot et al 2007); 9(Luckenbach et al 2009); 10(Lee et al 2000).…”

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Environmental sex reversal, Trojan sex genes, and sex ratio adjustment: conditions and population consequences

Stelkens

Wedekind

2010

Molecular Ecology

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The great diversity of sex determination mechanisms in animals and plants ranges from genetic sex determination (GSD, e.g. mammals, birds, and most dioecious plants) to environmental sex determination (ESD, e.g. many reptiles) and includes a mixture of both, for example when an individual's genetically determined sex is environmentally reversed during ontogeny (ESR, environmental sex reversal, e.g. many fish and amphibia). ESD and ESR can lead to widely varying and unstable population sex ratios. Populations exposed to conditions such as endocrine-active substances or temperature shifts may decline over time due to skewed sex ratios, a scenario that may become increasingly relevant with greater anthropogenic interference on watercourses. Continuous exposure of populations to factors causing ESR could lead to the extinction of genetic sex factors and may render a population dependent on the environmental factors that induce the sex change. However, ESR also presents opportunities for population management, especially if the Y or W chromosome is not, or not severely, degenerated. This seems to be the case in many amphibians and fish. Population growth or decline in such species can potentially be controlled through the introduction of so-called Trojan sex genes carriers, individuals that possess sex chromosomes or genes opposite from what their phenotype predicts. Here, we review the conditions for ESR, its prevalence in natural populations, the resulting physiological and reproductive consequences, and how these may become instrumental for population management.

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Sex determination in Nile tilapia, Oreochromis niloticus: Effect of high temperature during embryogenesis on sex ratio and sex differentiation pathway

Cited by 2 publications

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EFFECT OF DIFFERENT TEMPERATURES ON GROWTH AND SEX RATIO OF NILE TILAPIA (Oreochromis niloticus) FRY

EFFECT OF DIFFERENT TEMPERATURES ON GROWTH AND SEX RATIO OF NILE TILAPIA (Oreochromis niloticus) FRY

Environmental sex reversal, Trojan sex genes, and sex ratio adjustment: conditions and population consequences

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