Digestive coordination of the gastric function in Atlantic salmon Salmo salar juveniles

ABSTRACT: Artificial diets have been reported to produce suboptimal pH values in the stomach of salmonid species. Therefore, it is interesting to investigate the gastric function of different species fed commercial diets. In the present work, two groups of Atlantic salmon juveniles were either faste...

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Autores principales:	Bravo,Jonathan P., Hernández,Adrián J., Morales,Gabriel, Dantagnan,Patricio, Márquez,Lorenzo
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2018
Materias:	Salmo salar gastric pH gastric proteases gastric evacuation commercial diet diet buffering capacity
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2018000501083
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id	oai:scielo:S0718-560X2018000501083
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spelling	oai:scielo:S0718-560X20180005010832019-04-03Digestive coordination of the gastric function in Atlantic salmon Salmo salar juvenilesBravo,Jonathan P.Hernández,Adrián J.Morales,GabrielDantagnan,PatricioMárquez,Lorenzo Salmo salar gastric pH gastric proteases gastric evacuation commercial diet diet buffering capacity ABSTRACT: Artificial diets have been reported to produce suboptimal pH values in the stomach of salmonid species. Therefore, it is interesting to investigate the gastric function of different species fed commercial diets. In the present work, two groups of Atlantic salmon juveniles were either fasted or fed with a commercial diet. The gastric and duodenal pH values were measured over a 25 h post-prandial period and, dry matter, moisture and protease activity in the gastric chyme of the fed group were also determined. In the fed group, the gastric pH dropped to 3.5, and duodenal pH increased from 7.0 to 7.5 at the 4th h post-feeding, whereas fasted fish showed no significant changes in the gastric pH or duodenal pH. Fed animals showed: i) two discrete events of evacuation, before the 2nd hand after the 8th h of digestion, ii) a change in the moisture of the gastric chyme from less than 10% in the diet to 60% at the 2nd h post-feeding, and iii) a maximal gastric proteases activity of 600 U mL-1 at the 2nd h followed by a nearly constant of value of ~300 U mL-1. It can be concluded that the juveniles of the Atlantic salmon can suitably acidify a commercial diet to a value generally accepted as optimal for gastric proteases of fish, and to retain about 2/3 of the ingested diet under such conditions and at a nearly constant protease activity until the 8th h of digestion.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.46 n.5 20182018-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2018000501083en10.3856/vol46-issue5-fulltext-20
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Salmo salar gastric pH gastric proteases gastric evacuation commercial diet diet buffering capacity
spellingShingle	Salmo salar gastric pH gastric proteases gastric evacuation commercial diet diet buffering capacity Bravo,Jonathan P. Hernández,Adrián J. Morales,Gabriel Dantagnan,Patricio Márquez,Lorenzo Digestive coordination of the gastric function in Atlantic salmon Salmo salar juveniles
description	ABSTRACT: Artificial diets have been reported to produce suboptimal pH values in the stomach of salmonid species. Therefore, it is interesting to investigate the gastric function of different species fed commercial diets. In the present work, two groups of Atlantic salmon juveniles were either fasted or fed with a commercial diet. The gastric and duodenal pH values were measured over a 25 h post-prandial period and, dry matter, moisture and protease activity in the gastric chyme of the fed group were also determined. In the fed group, the gastric pH dropped to 3.5, and duodenal pH increased from 7.0 to 7.5 at the 4th h post-feeding, whereas fasted fish showed no significant changes in the gastric pH or duodenal pH. Fed animals showed: i) two discrete events of evacuation, before the 2nd hand after the 8th h of digestion, ii) a change in the moisture of the gastric chyme from less than 10% in the diet to 60% at the 2nd h post-feeding, and iii) a maximal gastric proteases activity of 600 U mL-1 at the 2nd h followed by a nearly constant of value of ~300 U mL-1. It can be concluded that the juveniles of the Atlantic salmon can suitably acidify a commercial diet to a value generally accepted as optimal for gastric proteases of fish, and to retain about 2/3 of the ingested diet under such conditions and at a nearly constant protease activity until the 8th h of digestion.
author	Bravo,Jonathan P. Hernández,Adrián J. Morales,Gabriel Dantagnan,Patricio Márquez,Lorenzo
author_facet	Bravo,Jonathan P. Hernández,Adrián J. Morales,Gabriel Dantagnan,Patricio Márquez,Lorenzo
author_sort	Bravo,Jonathan P.
title	Digestive coordination of the gastric function in Atlantic salmon Salmo salar juveniles
title_short	Digestive coordination of the gastric function in Atlantic salmon Salmo salar juveniles
title_full	Digestive coordination of the gastric function in Atlantic salmon Salmo salar juveniles
title_fullStr	Digestive coordination of the gastric function in Atlantic salmon Salmo salar juveniles
title_full_unstemmed	Digestive coordination of the gastric function in Atlantic salmon Salmo salar juveniles
title_sort	digestive coordination of the gastric function in atlantic salmon salmo salar juveniles
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2018
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2018000501083
work_keys_str_mv	AT bravojonathanp digestivecoordinationofthegastricfunctioninatlanticsalmonsalmosalarjuveniles AT hernandezadrianj digestivecoordinationofthegastricfunctioninatlanticsalmonsalmosalarjuveniles AT moralesgabriel digestivecoordinationofthegastricfunctioninatlanticsalmonsalmosalarjuveniles AT dantagnanpatricio digestivecoordinationofthegastricfunctioninatlanticsalmonsalmosalarjuveniles AT marquezlorenzo digestivecoordinationofthegastricfunctioninatlanticsalmonsalmosalarjuveniles
_version_	1714205212091088896

Digestive coordination of the gastric function in Atlantic salmon Salmo salar juveniles

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