FN Archimer Export Format
PT J
TI Effects of fasting and re-alimentation on gill and intestinal morphology and indicators of osmoregulatory capacity in genetically selected sea bass (Dicentrarchus labrax) populations with contrasting tolerance to fasting
BT 
AF ALIX, Maud
   BLONDEAU-BIDET, Eva
   GROUSSET, Evelyse
   SHIRANGHI, Ainaz
   VERGNET, Alain
   GUINAND, Bruno
   CHATAIN, Beatrice
   BOULO, Viviane
   LIGNOT, Jehan-Herve
AS 1:2;2:3;3:2;4:;5:1;6:2;7:1;8:1;9:2;
FF 1:;2:;3:;4:;5:PDG-RBE-MARBEC-LSEA;6:;7:PDG-RBE-MARBEC-L3AS;8:PDG-DOP-DCM-BOME-LALR;9:;
C1 Univ Montpellier, IFREMER, CNRS, UMR MARBEC,MARBEC,IRD, Pl Eugene Bataillon, F-34095 Montpellier 5, France
C2 IFREMER, FRANCE
   UNIV MONTPELLIER, FRANCE
   CNRS, FRANCE
SI PALAVAS
   MONTPELLIER
SE PDG-RBE-MARBEC-LSEA
   PDG-RBE-MARBEC-L3AS
   PDG-DOP-DCM-BOME-LALR
UM MARBEC
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 2.71
TC 9
UR https://archimer.ifremer.fr/doc/00354/46521/46285.pdf
LA English
DT Article
AB Fasting and refeeding occur naturally in predators but this is largely ignored when dealing with farmed fish. Therefore, the effects of 3-week fasting and re-alimentation (2.5% of the individual body mass) were investigated using two genetically selected populations (F2 generation) of 250 g juvenile sea bass (Dicentrarchus labrax L.). Blood osmolarity, gill and intestinal morphology and expression of the sodium pump (Na+, K+-ATPase, NKA) were studied on two phenotypes showing different degrees of body mass loss during food deprivation: one group losing body mass rapidly during fasting (F +) and the other one limiting body mass loss during the same period (F-).  Blood osmotic pressure significantly decreases due to re-alimentation in both groups, but this is compensated in the F + group. In this group, gill ionocytes are smaller and less numerous, but a significantly higher NKA gene expression is noted in the gills in comparison to the F- individuals 48 and 72 h after re-alimentation, and also in the posterior intestine 72 h after re-alimentation. This most probably occurs to compensate for a higher salt intake during nutrient absorption in comparison to the F- group. Furthermore, refed F- fish absorb more lipids along the proximal anterior intestine, and take longer to digest than the F + group, and show enterocyte vacuolization in the posterior intestine.  Therefore, the two selected populations have different postprandial digestive strategies: the F- fish optimize feed efficiency first at the cost of optimal hydromineral adjustment, while the F + group invests in osmoregulatory performance at the expense of digestive physiology. Statement of relevance  Our paper is highly relevant to the general field of commercial aquaculture. There is an increasing number of research articles dealing with fasting and refeeding in commercial fish and how to improve fish nutrition based on these physiological data and genetic selection.
PY 2017
PD FEB
SO Aquaculture
SN 0044-8486
PU Elsevier
VL 468
IS Part.1
UT 000390735200042
BP 314
EP 325
DI 10.1016/j.aquaculture.2016.10.016
ID 46521
ER

EF