Histology of the developing digestive system and the effect of food deprivation in larval green sturgeon (Acipenser medirostris) |
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| Institution: | 1. Aquaculture Industry Research Division, East Sea Fisheries Research Institute, Gangneung 25435, South Korea;2. Unit of Polar Genomics, Korea Polar Research Institute, Incheon 21990, South Korea;3. South Sea Environment Research Center, Korea Institute of Ocean Science and Technology (KIOST), Geoje 53201, South Korea;4. Department of Marine Environmental Science, Korea University of Science and Technology, Daejeon 34113, South Korea;5. Department of Marine Science, College of Natural Sciences, Incheon National University, Incheon 22012, South Korea;6. Research Institute of Basic Sciences, Incheon National University, Incheon 22012, South Korea;1. Tania Pérez: Laboratory of Fish Pathology, Faculty of Veterinary Sciences, Universidad de Zaragoza, 50013 Zaragoza, Spain;2. ClaudioAlba: Department of Galenic Pharmacy and Food Technology, Faculty of Veterinary Sciences, Complutense University of Madrid, 28040 Madrid, Spain;3. Marina Aparicio, Javier de Andrés & Juan M. Rodríguez: Department of Nutrition and Food Science, Faculty of Veterinary Sciences, Complutense University of Madrid, 28040 Madrid, Spain;4. José A. Ruiz Santa Quiteria& Alicia Gibello: Department of Animal Health, Faculty of Veterinary Sciences, Complutense University of Madrid, 28040 Madrid, Spain |
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| Abstract: | The histological development of the digestive tract in hatchery-reared green sturgeon (Acipenser medirostris) larvae and the effects of food deprivation on the digestive system organization were studied from hatching until 31 days post-hatching (dph). At hatching, the larval digestive system consisted of two rudiments: a large endodermal yolk sac and a primordial hind-gut. During the endogenous feeding phase, the wall of the yolk sac differentiated into the stomach (glandular and non-glandular regions) and the anterior and intermediate intestine, while the hind-gut primordium differentiated into the spiral valve and rectum. At the onset of exogenous feeding (15 dph at 16 °C), the organization and cytoarchitecture of the digestive system in green sturgeon larvae was generally similar to those of juveniles and adults. Larvae deprived of food exhibited a progressive deterioration, with subtle pathological changes observed after 5-d starvation: shrinkage of digestive epithelia, tissue degeneration, and necrosis were observed at 10–15 d of starvation (30 dph). No changes were observed in the mucous secretion of different regions of the digestive tract of food-deprived larvae. The histological analysis of the larval digestive system may be used to evaluate the nutritional condition of larval green sturgeon in their nursery habitats in spawning rivers, which are affected by dams and flow diversions. |
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