Prejuveniles of Mugil liza (Actinopterygii; Fam. Mugilidae) show digestive and metabolic flexibility upon different postprandial times and refeeding

ALBANESI,C.; LÓPEZ MAÑANES, A.A:.*AMBOS AUTORES CONTRIBUYERON DE IGUALMENTE A ESTE TRABAJO; GONZALEZ CASTRO, M. *AMBOS AUTORES CONTRIBUYERON DE IGUALMENTE A ESTE TRABAJO

JOURNAL OF COMPARATIVE PHYSIOLOGY B-BIOCHEMICAL SYSTEMIC AND ENVIRONMENTAL PHYSIOLOGY

SPRINGER HEIDELBERG

Año: 2022 vol. 192 p. 561 - 573

0174-1578

AbstractMany animals face periods of feeding restrictions implying fasting and refeeding. The determination of digestive/metabolicand body condition parameters at diferent times of food deprivation and after refeeding allows to evaluate the postprandialdynamics, the transition from feeding to fasting and the capacity to reverse digestive and metabolic alterations. In spite of itsphysiological importance, studies on estuarine-dependent detritivore fsh are lacking. We determined total mass (TM), relativeintestine length (RIL), hepatosomatic index (HSI), digestive enzymes activities in the intestine and energy reserves in liverand muscle at 0, 24, 72, 144 and 240 h after feeding and at 72 h after refeeding in prejuveniles of Mugil liza (Mugilidae) asa model species. After feeding, a decrease occurred in: TM (144 h, 25%), RIL (144 h, 23%); amylase and maltase (72 h, 45and 35%), sucrase (24 h, 40%) and lipase (24 h, 70%) in intestine; glycogen and free glucose (72 h, 90 and 92%) in liver. Inmuscle, glycogen (72?144 h) and free glucose (144 h) (170% and 165%, respectively) peak increased; triglycerides decreasedat 24?240 h (50%). After refeeding TM, RIL, carbohydrases activities in intestine, glycogen and free glucose in liver wererecovered. In muscle, glycogen and free glucose were similar to 0 h; lipase activity and triglycerides were not recovered.Trypsin and APN in intestine, triglycerides in liver, protein in liver and muscle and HSI did not change. The diferentialmodulation of key components of carbohydrates and lipid metabolism after feeding/refeeding would allow to face fasting andrecover body condition. Our results improve lacking knowledge about digestive and metabolic physiology of detritivore fsh.