Changes in ovarian gene expression profiles and plasma hormone levels in maturing European eel ( Anguilla anguilla ); Biomarkers for broodstock selection

Large scale gene duplication affected the European eel (Anguilla anguilla) after the 3R teleost duplication

“…Likewise, previous published eel RNA-sequencing experiments were also mapped to the eel genome and transcriptome. In this case, 52.2% (Coppe et al 2010), 57.9% (Burgerhout et al 2016), and 66.18% (Ager-Wick et al 2013) reads mapped concordantly against the eel genome whereas 84.3% (Coppe et al 2010), 69.5% (Burgerhout et al 2016), and 87.32 % (Ager-Wick et al 2013) mapped against the transcriptome.…”

Perfil de esteroides sexuales del capitán de la sabana (Eremophilus mutisii) durante un ciclo hidrológico completo

“…Ago. Sep. Anguilla anguilla(Burgerhout et al 2016), entre otras; sin embargo, futuras investigaciones, que incluyan edad y talla de maduración, áreas de desoves, proporción sexual, entre otros, tienen que llevarse a cabo, para continuar entendiendo la biología reproductiva de la especie. Al señor Pablo Guáqueta, pescador del Municipio de Suesca, por su colaboración en la obtención de los ejemplares.…”

Development of innovative methods for induction of European eel (Anguilla anguilla) spermatogenesis

“…This hypothesis is logical given that the average temperature experienced by the eels in the early stages of their oceanic migration is highly similar to that of our cold seawater treatment. Apart from preparing the eels for migration, the hypothesized natural transition could improve the reproductive potential of eel males, which is indicated by the increased androgen levels (Burgerhout et al 2016) and by increasing spermatogonial proliferation and synchronization.…”

“…E.g. even the progression through the proposed 5 freshwater eel stages, from yellow eels to migratory silver eels, are associated with maturational progression (Durif et al 2005) and eels which have progressed further towards silvering have been shown to be better responders for artificial hormonal maturation (Aroua et al 2005;Durif et al 2006;Mordenti et al 2013;Dirks et al 2014;Burgerhout et al 2016). Furthermore, different Anguilla species are found to show different stages of maturation at the initiation of migration (Durif et al 2005;Hagihara et al 2012;.…”

“…In summary, it is clear that environmental factors do affect eel maturation, and it is plausible that the right regimes of these factors can promote maturation. As more developed eels have been shown to be more responsive to hormonal treatment (Aroua et al 2005;Durif et al 2006;Mordenti et al 2013;Burgerhout et al 2016;Dirks et al 2014), manipulation of these environmental factors before hormonal injections might thus improve artificial European eel sexual maturation results. In particular temperature and pressure seems like good candidates for pretreatments while salinity and light regime alterations also show potential; however, to this day these latter factors are less studied.…”