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Understanding the gastrointestinal physiology and responses to feeding in air-breathing Anabantiform fishes

Journal article
Authors H. R. Goodrich
M. Bayley
Lina Birgersson
W. G. Davison
O. E. Johannsson
A. B. Kim
P. L. My
T. H. Tinh
P. N. Thanh
H. T. Thanh
C. M. Wood
Published in Journal of Fish Biology
Volume 96
Issue 4
Pages 986-1003
ISSN 0022-1112
Publication year 2020
Published at Department of Biological and Environmental Sciences
Pages 986-1003
Language en
Links dx.doi.org/10.1111/jfb.14288
Keywords acid-base regulation, ammonia excretion, feeding, gut, ion regulation, urea excretion, water rainbow-trout, acid-base-balance, postprandial alkaline tide, fresh-water, fundulus-heteroclitus, european flounder, dynamic action, intestine, excretion, tract, Fisheries, Marine & Freshwater Biology
Subject categories Freshwater ecology, Marine ecology, Fishery

Abstract

The Mekong Delta is host to a large number of freshwater species, including a unique group of facultative air-breathing Anabantiforms. Of these, the striped snakehead (Channa striata), the climbing perch (Anabas testudineus), the giant gourami (Osphronemus goramy) and the snakeskin gourami (Trichogaster pectoralis) are major contributors to aquaculture production in Vietnam. The gastrointestinal responses to feeding in these four species are detailed here. Relative intestinal length was lowest in the snakehead, indicating carnivory, and 5.5-fold greater in the snakeskin, indicating herbivory; climbing perch and giant gourami were intermediate, indicating omnivory. N-waste excretion (ammonia-N + urea-N) was greatest in the carnivorous snakehead and least in the herbivorous snakeskin, whereas the opposite trend was observed for net K+ excretion. Similarly, the more carnivorous species had a greater stomach acidity than the more herbivorous species. Measurements of acid-base flux to water indicated that the greatest postprandial alkaline tide occurred in the snakehead and a potential acidic tide in the snakeskin. Additional findings of interest were high levels of both PCO2 (up to 40 mmHg) and HCO3- (up to 33 mM) in the intestinal chyme of all four of these air-breathing species. Using in vitro gut sac preparations of the climbing perch, it was shown that the intestinal net absorption of fluid, Na+ and HCO3- was upregulated by feeding but not net Cl- uptake, glucose uptake or K+ secretion. Upregulated net absorption of HCO3- suggests that the high chyme (HCO3-) does not result from secretion by the intestinal epithelium. The possibility of ventilatory control of PCO2 to regulate postprandial acid-base balance in these air-breathing fish is discussed.

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