Hormonal sex reversal in red tilapia (Oreochromis niloticus and Oreochromis mossambicus) and inheritance of body colour in O. mossambicus and red tilapia: implications for commercial farming

Basavaraja, N.; Raghavendra, C. H.

doi:10.1007/s10499-017-0116-3

Cited by 10 publications

(9 citation statements)

References 21 publications

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“…Administrating high dose (100 mg 17α-MT/kg diet) reduced male percentage (80 %) , which is in agreement with the results of Marjani et al (2009) and Basavaraja and Raghavendra (2017) , who reported lower male percentage of red tilapia fry exposed to 100 mg of 17α-MT/kg feed compared to other lower doses. Wolf et al (2004) reported that administration of 17α-MT in fry fish diets suppresses the oogenesis process.…”

Section: Figure (1)supporting

confidence: 90%

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EFFECTS OF 17 Α-Methyltestosterone AND TRIBULUS TERRESTRIS EXTRACT ON SEX RATIO AND GONADS HISTOLOGY OF RED TILAPIA HYBRID

Amer

Zaki

Tahoun

et al. 2021

Egyptian Journal of Nutrition and Feeds

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ribulus terrestris extract and 17α-methyltestosterone were added into the diets of red tilapia fry with an initial average weight of 0.02 ± 0.003g and an average length of 0.6 ± 0.012cm to study their effects on sex reversal and gonads histology. Two T. terrestris extract treatments (1 and 2g/kg diet); three hormonal treatments of 17α-methyltestosterone (30, 60 and 100 mg/kg diet) were used in this study and a control group, the study lasted 112 days. Results showed that T. terrestris extract and 17α-MT has a potential effect on directing gonadal sex differentiation of red tilapia towards males depending on the dose applied. The highest male percentage 90% was obtained by 60 mg 17α-MT /kg diet followed by 2g T. terrestris / kg diet (84.40%). Histological examination of the gonads showed a clear deterioration in their structure as a result of hormonal therapy, the intensity of which increased with an increase in the hormonal dose. The effect from using a high dose of T. terrestris was slight. It can be concluded that the addition of T. terrestris extract and 17α-MT to the ration of red tilapia hybrid fry directs the gonads of red tilapia towards males and negatively affects the structure of the gonads.

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Section: Figure (1)supporting

confidence: 90%

“…Data were analyzed using Statistical Package for Social Science (SPSS) version 22 (2014). One-way ANOVA was applied to analyze the data (Basavaraja & Raghavendra, 2017). Duncan's test was used to determine the significance (p≤ 0.05) of differences among experimental treatments.…”

Section: Discussionmentioning

confidence: 99%

EFFECTS OF 17 Α-Methyltestosterone AND TRIBULUS TERRESTRIS EXTRACT ON SEX RATIO AND GONADS HISTOLOGY OF RED TILAPIA HYBRID

Amer

Zaki

Tahoun

et al. 2021

Egyptian Journal of Nutrition and Feeds

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“…On the contrary, some researchers get results indicating that sex reversal rate improved with low doses of the hormone such as Zaki et al, (2020), where the decreased male percentage of 80 % in the fish group treated with 100 mg 17 α -MT/kg diet compared to the male percentage of 90 % in the fish group treated with 60 mg 17 α-MT / kg diet. Also Marjani et al (2009) and Basavaraja and Raghavendra (2017) found lower male percentage in red tilapia fry using the 100 mg of 17α-MT/kg feed compared to other lower doses.…”

Section: Tribulus Terrestrismentioning

confidence: 87%

Effect of some Nutritional and Enviromental Factors on Production of Mono Sex Nile Tilapia (Oreochromis niloticus)

Sadek

Nady²,

Zied

2022

Journal of Animal and Poultry Production

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Two trials were conducted with Nile tilapia (Oreochromis niloticus) larvae and fry at the commercial fish hatchery in Fayoum Governorate during 2019. The first was conducted to study the effect of storage conditions for treated feeds with male hormone 17 α -methyltestosterone (17 α -MT), (light condition, store temperature. and time after preparation) on the rates of sex reversal, and growth performance. 5000 newly hatched fry were stocked in a hapa (2×1 m, and a water depth of 80 cm), and were fed with treated feed with 120 mg/kg (17α-MT) for 28 days. No significant difference among treated diets and the ability to sex-reverse fry. The highest sex reversal % was in the treated diets and refrigerated for use at 97.5% and prepared daily at 96.27%. The results of this trial indicate that the rates of male sexual transformation were affected by the method of preparing treated feed hormone, although this effect was limited. The second experiment was performed to study the effect of Tribulus terrestris powder on sexual transformation, compared to the male treated with 17α-MT in the same condition as the first experiment. A significant increase (P≤0.05) in percent male was observed with increasing Tribulus terrestris powder in the diets compared to control group. There are significant differences between treatments containing 17α-MT and the basal diet.The results of this trial refer to the recommendation that the Tribulus terrestris powder at 200 g/kg diet and 17α-MT at 150 mg/kg diet are the most effective for sex reversal in Nile tilapia larvae.

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“…The fish were maintained in three breeding tanks (3-m diameter and 1.5-m water depth) and were randomly placed in each tank assigned to male (M), female (F), and sex-changed (R) groups ( n = 10 for each group). The fish in the M and F groups were fed with commercial tilapia diet, while the fish in the R group were fed with a diet that contained 50 mg of 17α-MT/kg (bodyweight) from 10 to 40 days posthatch (dph) ( 28 ). After 40 dph, all the tested fish were fed with a normal diet.…”

Section: Methodsmentioning

confidence: 99%

Comprehensive Characterization of Circular RNAs in Ovary and Testis From Nile Tilapia

et al. 2022

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Circular RNA (circRNA) is an endogenous biomolecule in eukaryotes. It has tissue- and cell-specific expression patterns and can act as a microRNA sponge or competitive endogenous RNA. Although circRNA has been found in several species in recent years, the expression profiles in fish gonad are still not fully understood. We detected the expression of circRNA in the ovary, testis, and sex-changed gonad of tilapia by high-throughput deep sequencing, and circRNA-specific computing tools. A total of 20,607 circRNAs were obtained, of which 141 were differentially expressed in the testis and ovary. Among these circRNAs, 135 circRNAs were upregulated and 6 circRNAs were downregulated in female fish. In addition, GO annotation and KEGG pathway analysis of the host genes of circRNAs indicated that these host genes were mainly involved in adherens junction, androgen production, and reproductive development, such as ZP3, PLC, delta 4a, ARHGEF10, and HSD17b3. It is worth noting that we found that circRNAs in tilapia gonads have abundant miRNA-binding sites. Among them, 935 circRNAs have a regulatory effect on miR-212, 856 circRNAs have a regulatory effect on miR-200b-3p, and 529 circRNAs have a regulatory effect on miR-200b-5p. Thus, our findings provide a new evidence for circRNA–miRNA networks in the gonads in tilapia.

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Hormonal sex reversal in red tilapia (Oreochromis niloticus and Oreochromis mossambicus) and inheritance of body colour in O. mossambicus and red tilapia: implications for commercial farming

Cited by 10 publications

References 21 publications

EFFECTS OF 17 Α-Methyltestosterone AND TRIBULUS TERRESTRIS EXTRACT ON SEX RATIO AND GONADS HISTOLOGY OF RED TILAPIA HYBRID

EFFECTS OF 17 Α-Methyltestosterone AND TRIBULUS TERRESTRIS EXTRACT ON SEX RATIO AND GONADS HISTOLOGY OF RED TILAPIA HYBRID

Effect of some Nutritional and Enviromental Factors on Production of Mono Sex Nile Tilapia (Oreochromis niloticus)

Comprehensive Characterization of Circular RNAs in Ovary and Testis From Nile Tilapia

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