Physiological responses to short-term fasting among herbivorous, omnivorous, and carnivorous fishes

Day, Ryan D., Tibbetts, Ian R. and Secor, Stephen M. (2014) Physiological responses to short-term fasting among herbivorous, omnivorous, and carnivorous fishes. Journal of Comparative Physiology B, 184 4: 497-512. doi:10.1007/s00360-014-0813-4

Author Day, Ryan D.
Tibbetts, Ian R.
Secor, Stephen M.
Title Physiological responses to short-term fasting among herbivorous, omnivorous, and carnivorous fishes
Journal name Journal of Comparative Physiology B   Check publisher's open access policy
ISSN 0174-1578
Publication date 2014-03-07
Year available 2014
Sub-type Article (original research)
DOI 10.1007/s00360-014-0813-4
Open Access Status Not Open Access
Volume 184
Issue 4
Start page 497
End page 512
Total pages 16
Place of publication Heidelberg, Germany
Publisher Springer
Language eng
Subject 1310 Endocrinology
1303 Specialist Studies in Education
1103 Clinical Sciences
1105 Dentistry
1314 Physiology
Abstract We explored the integrated role of dietary specialization and feeding periodicity on the response of the gastrointestinal tract of teleosts fishes to short-term (7-10 days) fasting and refeeding. Fasted and fed herbivorous grass carp (Ctenopharyngodon idella), omnivorous channel catfish (Ictalurus punctatus), and carnivorous largemouth bass (Micropterus salmoides) were compared for digestive organ masses, intestinal morphology, gastrointestinal pH, and the specific activities and total intestinal capacities of the intestinal hydrolases aminopeptidase (APN) and maltase and intestinal nutrient transporters. All three species experience intestinal hypertrophy with feeding as noted by significant increases in enterocyte dimensions. Of the three, only I. punctatus experienced a postprandial increase in intestinal length, and only C. idella experienced significant modulation of intestinal microvillus length. Feeding resulted in acidification of the stomachs of I. punctatus and M. salmoides. Predicted to exhibit a relatively modest set of postprandial responses because of their more frequent feeding habits, C. idella only experienced increases in APN and maltase activity with feeding and no significant regulation of nutrient uptake. Significant regulation of hydrolase activities and nutrient uptake were exhibited by I. punctatus and M. salmoides, with I. punctatus experiencing the most comprehensive set of responses. As predicted by food habits, there was an interspecific gradient in intestinal length and glucose uptake extending from longer intestines and greater glucose uptake for the herbivorous C. idella, intermediate lengths and glucose uptake for the omnivorous I. punctatus, and shorter intestines and reduced glucose uptake for the carnivorous M. salmoides. Among teleosts fishes, short episodes of fasting lead to significant alterations in intestinal form and function that are rapidly restored with feeding.
Keyword Ctenopharyngodon idella
Ictalurus punctatus
Intestinal hydrolases
Intestinal morphology
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID IOS 0466139
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
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