Feeding regimes affected the circadian rhythms of pancreatic digestive enzymes and somatic growth in flathead grey mullet (Mugil cephalus) fry
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Autor/a
Solovyev, M.
Gisbert, E.
Fecha de publicación
2021-11-14ISSN
1095-6433
Resumen
The effect of different feeding regimes on the circadian rhythms of pancreatic digestive enzyme activities was evaluated in Mugil cephalus fry weighting 0.34 ± 0.01 g. Feeding regimes (feeding ration = 3% stocked biomass) differed on the number of meals offered per day: one, two and ten meals per day (R1, R2 and R3, respectively). The number of meals per day affected somatic growth; in particular, fry from the R3 group (0.80 ± 0.01 g) grew better than their congeners from R2 (0.70 ± 0.01 g) and R1 (0.63 ± 0.01 g) groups (P < 0.05). Feeding behaviour was modulated by the feeding regime, being the maximal gut fullness values found just after meal distribution in R1 and R2 groups, whereas this trend was not observed when feed was offered continuously during light hours (R3). Fry from R1 and R2 groups showed hyperphagia as they tended to store in their gut as much as possible feed particles to be later digested due to the limited daily meals. This strategy negatively affected feed digestion due to inappropriate enzyme to substrate ratio, changes in digestive enzyme activities and chyme transit times, which ultimately impaired growth performance. Enzyme activities were modulated by the number of meals, the more frequent the meals offered, the lower enzyme activities, supporting the hypothesis that digestive function is adapted to obtain a maximum benefit of the ingested nutrients. Present results showed that feeding grey mullet fry continuously during day light hours optimized feed digestion and promoted fry growth.
Tipo de documento
Artículo
Versión del documento
Versión aceptada
Lengua
Inglés
Materias (CDU)
637 - Productos de los animales domésticos, de la caza y de la pesca
Páginas
33
Publicado por
Elsevier
Publicado en
Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology
Citación
Solovyev, M., and E. Gisbert. 2021. "Feeding Regimes Affected The Circadian Rhythms Of Pancreatic Digestive Enzymes And Somatic Growth In Flathead Grey Mullet (Mugil Cephalus) Fry". Comparative Biochemistry And Physiology Part A: Molecular & Integrative Physiology 264: 111116. doi:10.1016/j.cbpa.2021.111116.
Número del acuerdo de la subvención
EC/H2020/862658/EU/New Technologies, Tools and Strategies for a Sustainable, Resilient and Innovative European Aquaculture/NewTechAqua
Program
Aqüicultura
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