title: Effect of diet composition on growth performance, hepatic metabolism and antioxidant activities in Siberian sturgeon (Acipenser baerii, Brandt, 1869) submitted to starvation and refeeding.
abstract: Many fish species undergo natural starvation periods. Adaptation to starvation is possible through the activation of behavioral, biochemical and physiological mechanisms. Knowledge of the effect of dietary nutrients on the intermediary metabolism during starvation and refeeding can be useful to improve fish health and optimize aquaculture production. To analyze the effect of dietary nutrients on liver metabolism of Siberian sturgeon (Acipenser baerii) submitted to starvation and refeeding, four isoenergetic diets differing in nutrient composition were designed: LP-St (38 % protein, 12 % lipid, 36 % carbohydrate), HP-St (44 % protein, 10 % lipid, 30 % carbohydrate), LP-L (38 % protein, 18 % lipid, 25 % carbohydrate) and HP-L (44 % protein, 16 % lipid, 22 % carbohydrate). Four groups of fish were fed 3 weeks to satiety with the corresponding diet, starved for 2 weeks and then refeed 5 weeks to satiety on the same diet. Starvation mobilized the hepatic lipid store to a greater extent than glycogen. Starvation increased superoxide dismutase activity irrespective of the diet, while low protein diets (LP-St and LP-L) increased catalase activity. The oxidative damage decreased after 5 weeks of refeeding. Refeeding the starved fish on the HP-St diet promoted the greatest growth performance. In addition to reporting for the first time the effect of diet composition on growth, liver composition and antioxidant activities in Siberian sturgeon submitted to starvation and refeeding, our findings suggest that refeeding on HP-St diet stimulated the use of dietary carbohydrates and allowed a protein sparing effect in Siberian sturgeon.
authors.affiliation: Department of Aquaculture, Faculty of Marine Sciences, Tarbiat Modares University, P.O. BOX 64414-356, Noor, Mazandaran, Iran.
authors.forename: Sedigheh
authors.initials: S
authors.lastname: Babaei
authors.affiliation: Department of Aquaculture, Faculty of Marine Sciences, Tarbiat Modares University, P.O. BOX 64414-356, Noor, Mazandaran, Iran. aabedian@modares.ac.ir.
authors.forename: Abdolmohammad
authors.initials: A
authors.lastname: Abedian Kenari
authors.affiliation: Cellular and Molecular Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Mehdi
authors.initials: M
authors.lastname: Hedayati
authors.affiliation: International Sturgeon Research Institute of Caspian Sea, Guilan, Iran.
authors.forename: Mohammad Ali
authors.initials: MA
authors.lastname: Yazdani Sadati
authors.affiliation: Departament de Bioquímica i Biologia Molecular, Facultat de Farmàcia, Universitat de Barcelona, Barcelona, Spain.
authors.forename: Isidoro
authors.initials: I
authors.lastname: Metón
mesh_terms: D000818:Animals; D017756:Aquaculture / Q000379:methods; D002374:Catalase / Q000378:metabolism; D004032:Diet; D004040:Dietary Carbohydrates / Q000494:pharmacology*; D004041:Dietary Fats / Q000494:pharmacology*; D004044:Dietary Proteins / Q000494:pharmacology*; D005399:Fishes / Q000254:growth & development / Q000378:metabolism; D008099:Liver / Q000378:metabolism*; D008112:Liver Glycogen / Q000378:metabolism; D013217:Starvation / Q000378:metabolism*; D013482:Superoxide Dismutase / Q000378:metabolism
chemical_list: D004040:Dietary Carbohydrates; D004041:Dietary Fats; D004044:Dietary Proteins; D008112:Liver Glycogen; D002374:Catalase; D013482:Superoxide Dismutase
keywords: Energy reserve; Hepatosomatic index; Oxidative stress; Refeeding; Siberian sturgeon; Starvation