MONOGRAFÍA DE PROTOCOLOS PARA OBTENER POBLACIONES MONOSEXO DE TILAPIA NILÓTICA (Oreochromis niloticus; TREW. 1983)  <span class="so-article-trans-title" dir="auto"> Translated title: PROTOCOLS MONOGRAPH TO OBTAIN MONSEXUALTILAPIA NILÓTICA POPULATIONS (Oreochromis niloticus; TREW. 1983) </span>

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Abstract

El manejo de poblaciones monosexo de machos de tilapias es una solución para las dificultades productivas mostradas por esta especie gracias a su precocidad reproductiva y menores tasas de desarrollo de las hembras. Una población monosexo controla la reproducción indeseada y brinda mayor uniformidad a los lotes, repercutiendo en los ciclos productivos, ganancias superiores y mayor rentabilidad. Se recogen los diferentes protocolos en los campos investigativos y productivos, por los cuales es posible desarrollar poblaciones monosexo de machos de tilapia, como la androgénesis, ginogénesis y GMT, reversión sexual.

Translated abstract

The management of male monosexual tilapia population is a solution to the production difficulties showed by this species due to its reproductive precociousness and low rates of female development. A monosexual population controls non-desired reproduction and provides higher levels of uniformity in each lot, having an impact on the productive cycles, higher profit and better profitability. Different protocols in the research and productive fields which allow monosexual tilapia male populations such as androgenesis, gynogenesis and GMT are gathered.

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Sex determination and sex differentiation in fish: an overview of genetic, physiological, and environmental influences

Robert Devlin, Yoshitaka Nagahama (2002)

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Tilapia sex determination: Where temperature and genetics meet.

J.F. Baroiller, H D'Cotta, E Bezault … (2009)

This review deals with the complex sex determining system of Nile tilapia, Oreochromis niloticus, governed by the interactions between a genetic determination and the influence of temperature, shown in both domestic and wild populations. Naturally sex reversed individuals are strongly suggested in two wild populations. This can be due to the masculinising temperatures which some fry encounter during their sex differentiation period when they colonise shallow waters, and/or to the influence of minor genetic factors. Differences regarding a) thermal responsiveness of sex ratios between and within Nile tilapia populations, b) maternal and paternal effects on temperature dependent sex ratios and c) nearly identical results in offspring of repeated matings, demonstrate that thermosensitivity is under genetic control. Selection experiments to increase the thermosensitivity revealed high responses in the high and low sensitive lines. The high-line showed approximately 90% males after 2 generations of selection whereas the weakly sensitive line had 54% males. This is the first evidence that a surplus of males in temperature treated groups can be selected as a quantitative trait. Expression profiles of several genes (Cyp19a, Foxl2, Amh, Sox9a,b) from the gonad and brain were analysed to define temperature action on the sex determining/differentiating cascade in tilapia. The coexistence of GSD and TSD is discussed.