NDLI: Development of digestive tract and enzyme activities during the early ontogeny of the tropical gar Atractosteus tropicus

Content Provider	Springer Nature Link
Author	Frías Quintana, C. A. Márquez Couturier, G. Alvarez González, C. A. Tovar Ramírez, D. lasco Soria, H. Galaviz Espisa, M. A. Martínez García, R. Camarillo Coop, S. Martínez Yañez, R. Gisbert, E.
Copyright Year	2015
Abstract	Changes in digestive enzyme activity and histology were studied in Atractosteus tropicus embryos, larvae and juvenile periods. Alkaline protease, chymotrypsin, carboxypeptidase A, lipase and α-amylase were detected in all periods and gradually increased until reaching the maximum peak in juveniles; meanwhile, acid protease was first detected at 5 days after hatching (dah) when first feeding started and trypsin and leucine aminopeptidase activities were detected from 19 dah, their values being increased gradually until reaching a maximum value at 31 dah. Acid and alkaline phosphatase activities increased from yolk-sac absorption (3 dah) until day 31 after hatching. Zymogram for acid protease showed two bands in active forms (0.4 and 0.5 Rfs) from day 5 after hatching and a third protease form (0.3 Rf) that appears at 31 dah. Two active forms (26.3 and 24.9 kDa) were detected using SDS-PAGE alkaline proteases zymogram at 5 dah, and an additional active form (44.1 kDa) was detected at 7 dah. Regarding the histological development of the digestive system, the exocrine pancreas containing zymogen granules was already visible at 3 dah, whereas at 5 dah first gastric glands were already detected in the stomach. Between 7 and 9 dah, the digestive tract of A. tropicus resembled that of a juvenile specimen with a well-developed and short oesophagus, stomach divided into a glandular and non-glandular (pyloric) stomach, folded intestine with pyloric caeca and a well-developed spiral valve (posterior intestine). Considering this, larvae of A. tropicus are capable of digesting several foods from yolk absorption (3 dah), maximizing its activities at 15 dah, age at which the organisms maximize its capability to absorb nutrients from diets provided.
Starting Page	1075
Ending Page	1091
Page Count	17
File Format	PDF
ISSN	09201742
Journal	Fish Physiology and Biochemistry
Volume Number	41
Issue Number	5
e-ISSN	15735168
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-05-19
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	α-Amylase Atractosteus tropicus Phosphatase Lipase Ontogeny Proteases Freshwater & Marine Ecology Animal Physiology Animal Anatomy / Morphology / Histology Animal Biochemistry Zoology
Content Type	Text
Resource Type	Article
Subject	Physiology Medicine Biochemistry Aquatic Science

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