Genomics and epigenomics in the American eel

Population genetics of the American eel (A. rostrata) have been focus of intensive research and the occurrence of a single panmictic population represented a controversial issue, but recent genetic studies show definitive evidence supporting this condition (Côté et al., 2013; Babin et al., 2017). However, Caribbean’s eels’ populations remain barely unnoted until present. This element is relevant because commercial and subsistence fisheries are using this resource. The analysis of samples from the Gulf of Mexico and the Caribbean would shed light over population genetics in the species’ southern distribution range, but also provide information on demography, ecotypes and relationships inside the genetic pool of continental populations.

However, in spite that A. rostrata is represented by a single panmictic population, different ecotypes (e.g. different growth rates, sizes, and sex proportions according to geographical source) have been described. Due to this, restocking isn’t always successful and local management is necessary. At present it is known that epigenetic factors play a role in the adaptation of different species phenotypes to the environment. Regarding this, in this project we will study the epigenetic mechanisms underlying the differential gene expression of the ecotypes and involved in the sex differentiation of A. rostrata.