Abstract

DE LA CRUZ BARRUETO, Katicsa Natalie; KANESHIMA GONZALEZ, Kenyi; PONCIANO QUEZADA, Miguel Ángel  and  CULQUICHICONMALPICA, Zoila Gladis. Sex Ratio and production parameters of Oreochromis niloticus “Tilapia”. Manglar [online]. 2023, vol.20, n.4, pp.309-316.  Epub Dec 17, 2023. ISSN 1816-7667.  http://dx.doi.org/10.57188/manglar.2023.035.

Oreochromis niloticus farming has been affected by excessive reproduction in cropping systems, which causes delayed growth and small sizes at harvest, becoming unmarketable, creating the need to reverse the sex of the females, being possible with hormonal sex reversal techniques such as 17 α methyltestosterone (MT). The objective of this research was to determine the sexual ratio and obtain the production parameters in specimens of O. niloticus with the MT hormone which was supplied in food at 45% protein, with a dose of 24 mg of MT/kg of food, for 28 days. Sex determination was carried out using the squash technique and microscope observation. The information was analyzed using descriptive and inferential statistics at 95% confidence in the Excel program. We worked with 10% of the total population, reaching 95.2% males. The gonads of the females showed oocytes, while in the gonads of males’ spermatocytes were observed, they presented a survival of 96.33%, an increase in weight of 13.46 g and length of 7.82 cm.

Keywords : Oreochromis niloticus; Tilapia; 17 Αlfa Methyl Testosterone; Sex Ratio; Productive parameters..

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