Abstract

CASTILLO, Ana et al. Effect of native and modified starches on nutritional and hysiological performance of wild juveniles of red grouper (Epinephelus morio). Ecosistemas y recur. agropecuarios [online]. 2018, vol.5, n.15, pp.491-500. ISSN 2007-901X.  https://doi.org/10.19136/era.a5n15.1548.

The aim of this study was to evalúate carbohydrates utilization by wild red grouper Epinephelus morio. Juveniles were fed during 93 d on a selection of starches: native raw cornstarch (RCS), waxy cornstarch (WCS), raw potato starch (RPS) and gelatinized potato starch (GP) at 20% inclusión level. The best growth was obtained in fish fed cornstarch either native raw of waxy cornstarch (p < 0.05). Hepatosomatic Índex and blood glucose (40 mg dL-1) were similar as well as hematocrit valúes (50%) (p > 0.05), whereas glycogen content increased up to 200 mg g-1 with waxy cornstarch. Specific activity of α-glucosidase and α-amylase remained stable (p > 0.05). Hepatic glycolytic enzymes increased with raw native and waxy cornstarch (p < 0.05); metabolic enzyme glucose 6 phosphate dehydrogenase (G6P-DH) was activated with raw native cornstarch (p < 0.05) while pyruvate kinase (PK) remained stable regardless of treatments (p > 0.05). Hexokinase (HK1) and glucokinase (GK) varied according to carbohydrate source: valúes were higher with cornstarches than potato starches (p < 0.05). Pentose monophosphate shunt (HMS) remained not altered by starch sources (p > 0.05). In final, the low size of granules from cornstarch favored the assimilation in liver of wild juveniles red grouper.

Keywords : Grouper; digestive enzymes; glucose; glycogen; metabolic enzymes.

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