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Author(s): Magnoni L.J.
Salas-Leiton E.
Peixoto M.-J.
Pereira L.
Silva-Brito F.
Fontinha F.
Gonçalves J.F.M.
Wilson J.M.
Schrama J.W.
Ozório R.O.A.
Title: Dietary electrolyte balance affects growth performance, amylase activity and metabolic response in the meagre (Argyrosomus regius)
Publisher: Elsevier
Issue Date: 2017
Abstract: Dietary ion content is known to alter the acid-base balance in freshwater fish. The current study investigated the metabolic impact of acid-base disturbances produced by differences in dietary electrolyte balance (DEB) in the meagre (Argyrosomus regius), an euryhaline species. Changes in fish performance, gastric chyme characteristics, pH and ion concentrations in the bloodstream, digestive enzyme activities and metabolic rates were analyzed in meagre fed ad libitum two experimental diets (DEB 200 or DEB 700 mEq/kg) differing in the Na2CO3 content for 69 days. Fish fed the DEB 200 diet had 60–66% better growth performance than the DEB 700 group. Meagre consuming the DEB 200 diet were 90–96% more efficient than fish fed the DEB 700 diet at allocating energy from feed into somatic growth. The pH values in blood were significantly lower in the DEB 700 group 2 h after feeding when compared to DEB 200, indicating that acid-base balance in meagre was affected by electrolyte balance in diet. Osmolality, and Na+ and K+ concentrations in plasma did not vary with the dietary treatment. Gastric chyme in the DEB 700 group had higher pH values, dry matter, protein and energy contents, but lower lipid content than in the DEB 200 group. Twenty-four hours after feeding, amylase activity was higher in the gastrointestinal tract of DEB 700 group when compared to the DEB 200 group. DEB 700 group had lower routine metabolic (RMR) and standard metabolic (SMR) rates, indicating a decrease in maintenance energy expenditure 48 h after feeding the alkaline diet. The current study demonstrates that feeding meagre with an alkaline diet not only causes acid-base imbalance, but also negatively affects digestion and possibly nutrient assimilation, resulting in decreased growth performance. © 2017 Elsevier
Subject: amylase
sodium carbonate
acid base balance
animal experiment
animal tissue
Argyrosomus regius
blood pH
body growth
body weight
caloric intake
controlled study
dietary electrolyte balance
electrolyte balance
energy expenditure
enzyme activity
food intake
liver weight
metabolic rate
nutrient uptake
potassium blood level
priority journal
sodium blood level
stomach pH
animal food
energy metabolism
growth, development and aging
Animal Feed
Energy Metabolism
Water-Electrolyte Balance
Source: Comparative Biochemistry and Physiology Part - B: Biochemistry and Molecular Biology, vol. 211, p. 8-15
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:CIIMAR - Artigo em Revista Científica Internacional

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