Abstract
Enterocytes of the anterior to midsection of the intestine in grouper Epinephelus coioides larvae were compared among different treatments: unfed to the point-of-no-return (PNR), fed natural food only, and co-fed natural food and artificial diet. On day 3, the nutritional condition of unfed grouper larvae regressed with its reduced enterocyte heights which were further degraded on day 4, the PNR, when all the enterocytes were in advanced stages of apoptosis. The apoptosis appeared to be internally directed via the mitochondria. Among day 3 fed larvae, enterocyte heights of those fed artificial diet did not differ from those fed natural food only. Dietary phospholipid deficiency was indicated in larvae co-fed artificial diet on day 3 with an unusually large chylomicron opening into the inter-enterocyte space, and on days 6 and 33 by intestinal steatosis. On day 19, scant to absent lipid droplets in enterocytes of larvae disclosed heightened nutritional requirement preparatory to metamorphosis. As observed in unfed day 3 and premetamorphic day 19 E. coioides, larvae undergoing critical periods and starvation during development employ apoptosis to dispose of degenerated enterocytes that are phagocytosed by adjacent healthy enterocytes without causing inflammatory distress. Upon metamorphosis, grouper larval gut develops better immunity fitness with eosinophilic granule cells observed in the intestinal epithelia of day 33 larvae. Future studies on grouper larval nutrition may consider the appropriate dietary phospholipid levels and larval competence to biosynthesize highly unsaturated fatty acid from linoleic acid vis-à-vis the use of plant ingredients in artificial diet formulations. In vivo challenge tests may validate appropriate dietary nutrient supplementation and lead to better feed formulation, matching the varying energetic demands and digestive capacities of developing E. coioides larvae.
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The authors are grateful to the Commission on Higher Education, the Philippine Council for Agriculture, Aquatic Natural Resources Research and Development and the Science Education Institute of the Department of Science and Technology, and the Bureau of Agricultural Research-Department of Agriculture of the Government of the Philippines for financial support (extended to Y.H. Primavera-Tirol) and to the Southeast Asian Fisheries Development Center-Aquaculture Department for the use of its aquaculture facilities. Thanks are given to V. Balinas for statistical advice, to T. Billena-Hagy, C. Sombito, and N. Bautista for technical assistance with the transmission electron microscopy, and to I. Tendencia for the artwork. Helpful advice from two anonymous reviewers that improved the manuscript is gratefully acknowledged.
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Primavera-Tirol, Y.H., Coloso, R.M., Quinitio, G.F. et al. Ultrastructure of the anterior intestinal epithelia of the orange-spotted grouper Epinephelus coioides larvae under different feeding regimes. Fish Physiol Biochem 40, 607–624 (2014). https://doi.org/10.1007/s10695-013-9870-y
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DOI: https://doi.org/10.1007/s10695-013-9870-y