Genomic Basis of Sex Change in Fish

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By:"Hui Liu"
Published on 2016 by

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The aim of this thesis is to investigate how sex change is regulated in fish at the molecular level. Teleost fishes display remarkably diverse and plastic sexual development patterns. Functional sex change is widespread in marine fishes, spanning at least 27 families, and including many species of commercial importance. The bluehead wrasse (Thalassoma bifasciatum), a small Caribbean reef fish, exhibits female-to-male (protogynous) sex change based on social context. Removing the dominant male from a social group can induce sex change in the largest females. The speed of this process is astonishing: the behavioral changes can begin within minutes, followed by gonadal sex change that occurs in 8 to 10 days, while changes in the external morphology can take up to 21 days. Significant progress has been made in understanding the ecology and the neuroendocrine bases of sex change in this species, but detailed mechanisms still remain elusive, especially at the molecular level.


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