@article{PAR00012463,
  title = {{T}emperature modulates the progression of vitellogenesis in the {E}uropean eel},
  author = {{M}azzeo, {I}. and {P}enaranda, {D}. {S}. and {G}allego, {V}. and {B}aloche, {S}. and {N}ourizadeh-{L}illabadi, {R}. and {T}veiten, {H}. and {D}ufour, {S}ylvie and {A}sturiano, {J}. {F}. and {W}eltzien, {F}. {A}. and {P}erez, {L}.},
  editor = {},
  language = {{ENG}},
  abstract = {{W}ild female {E}uropean eels were matured with {CPE} (carp pituitary extract) under three thermal regimes, two of which were variable ({T}10-15 and {T}15-18, moving from 10 to 15 degrees {C} and from 15 to 18 degrees {C}, respectively) and one constant, at 18 degrees {C} ({T}18). {B}efore and during hormonal treatment, the eels were sampled and biometric measurements were taken. {I}mmunoassays of sex steroids and vitellogenin were performed, as well as q{PCR} analyses of gene expression (ovarian cyp19a1) and ovarian histology. {P}rior to the hormonal treatment, the silver eels which had been maintained at 18 degrees {C} showed lower 11-{KT} and {E}2 plasma levels compared to those maintained at 10 degrees {C}. {I}n addition, in the early vitellogenic stage, the androgen and cyp19a1 levels were lower at 18 degrees {C} than at 10 degrees {C}. {B}oth these results and the positive correlations found between {GSI} and 11-{KT} (at the {PV} stage) and between oocyte diameter and cyp19a1 levels (in the {EV} stage) suggest that early ovarian development is facilitated at low temperatures. {V}itellogenesis was induced by {CPE} in all the thermal groups, but progression to the mid-vitellogenic stage was only observed after an accumulation of 900-1200 degrees {D}, at 15 or 18 degrees {C}, and progression to the late vitellogenic stage was only observed after an accumulation higher than 1300 degrees {D}, at 18 degrees {C}. {A}lthough temperature increased the rate of {CPE}-induced ovarian development, our results clearly indicate that this increase is not linear, but exponential, with acceleration in the increase of {GSI} at 18 degrees {C} from the mid-vitellogenic stage, or after an accumulation of 1300 degrees {D}. {F}or the first time, a down-regulation of ovarian cyp19a1 caused by high temperatures in {CPE}-treated eels was observed. {T}hese results demonstrate that temperature can modulate eel ovarian development both before and after exogenous hormonal stimulations, and this knowledge could be used to manipulate the timing of vitellogenesis progression under laboratory conditions.},
  keywords = {{A}nguilla anguilla ; {T}hermal regime ; {S}ex maturation ; {S}ex steroids ; cyp19a1},
  booktitle = {},
  journal = {{A}quaculture},
  volume = {434},
  numero = {},
  pages = {38--47},
  ISSN = {0044-8486},
  year = {2014},
  DOI = {10.1016/j.aquaculture.2014.07.020},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00012463},
}