FN Archimer Export Format
PT J
TI Salinity reduction benefits European eel larvae: Insights at the morphological and molecular level
BT 
AF POLITIS, Sebastian Nikitas
   MAZURAIS, David
   SERVILI, Arianna
   ZAMBONINO-INFANTE, Jose-Luis
   MIEST, Joanna J.
   TOMKIEWICZ, Jonna
   BUTTS, Ian A. E.
AS 1:1;2:2;3:2;4:2;5:3,4;6:1;7:1,5;
FF 1:;2:PDG-RBE-PFOM-LARN;3:PDG-RBE-PFOM-LARN;4:PDG-RBE-PFOM-LARN;5:;6:;7:;
C1 Tech Univ Denmark, DTU, Natl Inst Aquat Resources, Lyngby, Denmark.
   Ifremer, Marine Environm Sci Lab UMR 6539, Plouzane, France.
   GEOMAR, Helmholtz Ctr Ocean Res, Kiel, Germany.
   Univ Greenwich, Dept Life & Sports Sci, Chatham, Kent, England.
   Auburn Univ, Sch Fisheries Aquaculture & Aquat Sci, Auburn, AL 36849 USA.
C2 UNIV TECH DENMARK (DTU AQUA), DENMARK
   IFREMER, FRANCE
   GEOMAR, GERMANY
   UNIV GREENWICH, UK
   UNIV AUBURN, USA
SI BREST
SE PDG-RBE-PFOM-LARN
UM LEMAR
IN WOS Ifremer jusqu'en 2018
   DOAJ
   copubli-europe
   copubli-int-hors-europe
IF 2.776
TC 20
UR https://archimer.ifremer.fr/doc/00448/55982/57456.pdf
   https://archimer.ifremer.fr/doc/00448/55982/57457.xlsx
LA English
DT Article
AB European eel (Anguilla anguilla) is a euryhaline species, that has adapted to cope with both, hyper- and hypo-osmotic environments. This study investigates the effect of salinity, from a morphological and molecular point of view on European eel larvae reared from 0 to 12 days post hatch (dph). Offspring reared in 36 practical salinity units (psu; control), were compared with larvae reared in six scenarios, where salinity was decreased on 0 or 3 dph and in rates of 1, 2 or 4 psu/day, towards iso-osmotic conditions. Results showed that several genes relating to osmoregulation (nkcc2 alpha, nkcc2 beta, aqp1dup, aqpe), stress response (hsp70, hsp90), and thyroid metabolism (thr alpha A, thr alpha B, thr beta B, diol, dio2, dio3) were differentially expressed throughout larval development, while nkcc1 alpha, nkcc2 beta, aqp3, aqp 1dup, aqpe, hsp90, thr alpha A and dio3 showed lower expression in response to the salinity reduction. Moreover, larvae were able to keep energy metabolism related gene expression (atp6, cox1) at stable levels, irrespective of the salinity reduction. As such, when reducing salinity, an energy surplus associated to reduced osmoregulation demands and stress (lower nkcc, aqp and hsp expression), likely facilitated the observed increased survival, improved biometry and enhanced growth efficiency. Additionally, the salinity reduction decreased the amount of severe deformities such as spinal curvature and emaciation but also induced an edematous state of the larval heart, resulting in the most balanced mortality/deformity ratio when salinity was decreased on 3 dph and at 2 psu/day. However, the persistency of the pericardial edema and if or how it represents an obstacle in further larval development needs to be further clarified. In conclusion, this study clearly showed that salinity reduction regimes towards iso-osmotic conditions facilitated the European eel pre-leptocephalus development and revealed the existence of highly sensitive and regulated osmoregulation processes at such early life stage of this species.
PY 2018
PD JUL
SO Plos One
SN 1932-6203
PU Public Library Science
VL 13
IS 6
UT 000435090700050
DI 10.1371/journal.pone.0198294
ID 55982
ER

EF