EsturgeonV1, Main, Merge, bibRecord, 001470

Gut blood flow in fish during exercise and severe hypercapnia.

Identifieur interne : 001470 ( Main/Merge ); précédent : 001469; suivant : 001471

Gut blood flow in fish during exercise and severe hypercapnia.

Auteurs : A P Farrell [Canada] ; H. Thorarensen ; M. Axelsson ; C E Crocker ; A K Gamperl ; J J Cech

Source :

Comparative biochemistry and physiology. Part A, Molecular & integrative physiology [ 1095-6433 ] ; 2001.

RBID : pubmed:11246044

English descriptors

KwdEn :
- Animals, Fishes (physiology), Hypercapnia (physiopathology), Physical Conditioning, Animal, Regional Blood Flow, Splanchnic Circulation.
MESH :
- physiology : Fishes.
- physiopathology : Hypercapnia.
- Animals, Physical Conditioning, Animal, Regional Blood Flow, Splanchnic Circulation.

Abstract

This paper reviews the effects of exercise and hypercapnia on blood flow to the splanchnic circulation. Brief struggling behaviours are known to decrease blood flow to the gut (GBF). Likewise, prolonged swimming in unfed fish has been shown to reduce GBF in proportion to the increased oxygen uptake. Therefore, the normal postprandial increase in GBF theoretically should be impaired whenever fish are active. However, indirect evidence suggests that GBF is spared to some degree when fed fish swim continuously but at a cost (10-15%) to their critical swimming speed. Severe respiratory acidosis can be created by the new intensive aquaculture settings that use oxygen injection into re-circulated water. The only study so far to examine the effects of severe hypercapnia on GBF and its regulation showed that routine GBF and alpha-adrenergic control of GBF remained normal in unfed white sturgeon (Acipenser transmontanus). However, severe hypercapnia produced a hyperactive state and increased sensitivity of GBF to struggling. As a result, routine GBF was maintained for a short period of time. Thus, environmental changes such as severe hypercapnia can indirectly impact GBF through altered struggling behaviour, but the implications of the overall reduction in GBF to food assimilation have yet to be established.

PubMed: 11246044

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pubmed:11246044

Le document en format XML

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<author><name sortKey="Farrell, A P" sort="Farrell, A P" uniqKey="Farrell A" first="A P" last="Farrell">A P Farrell</name>
<affiliation wicri:level="1"><nlm:affiliation>Department of Biological Sciences, Simon Fraser University, V5A 1S6, Burnaby, BC, Canada. farrell@sfu.ca</nlm:affiliation>
<country xml:lang="fr">Canada</country>
<wicri:regionArea>Department of Biological Sciences, Simon Fraser University, V5A 1S6, Burnaby, BC</wicri:regionArea>
<wicri:noRegion>BC</wicri:noRegion>
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<author><name sortKey="Thorarensen, H" sort="Thorarensen, H" uniqKey="Thorarensen H" first="H" last="Thorarensen">H. Thorarensen</name>
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<author><name sortKey="Axelsson, M" sort="Axelsson, M" uniqKey="Axelsson M" first="M" last="Axelsson">M. Axelsson</name>
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<author><name sortKey="Crocker, C E" sort="Crocker, C E" uniqKey="Crocker C" first="C E" last="Crocker">C E Crocker</name>
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<author><name sortKey="Gamperl, A K" sort="Gamperl, A K" uniqKey="Gamperl A" first="A K" last="Gamperl">A K Gamperl</name>
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<author><name sortKey="Cech, J J" sort="Cech, J J" uniqKey="Cech J" first="J J" last="Cech">J J Cech</name>
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<term>Physical Conditioning, Animal</term>
<term>Regional Blood Flow</term>
<term>Splanchnic Circulation</term>
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<front><div type="abstract" xml:lang="en">This paper reviews the effects of exercise and hypercapnia on blood flow to the splanchnic circulation. Brief struggling behaviours are known to decrease blood flow to the gut (GBF). Likewise, prolonged swimming in unfed fish has been shown to reduce GBF in proportion to the increased oxygen uptake. Therefore, the normal postprandial increase in GBF theoretically should be impaired whenever fish are active. However, indirect evidence suggests that GBF is spared to some degree when fed fish swim continuously but at a cost (10-15%) to their critical swimming speed. Severe respiratory acidosis can be created by the new intensive aquaculture settings that use oxygen injection into re-circulated water. The only study so far to examine the effects of severe hypercapnia on GBF and its regulation showed that routine GBF and alpha-adrenergic control of GBF remained normal in unfed white sturgeon (Acipenser transmontanus). However, severe hypercapnia produced a hyperactive state and increased sensitivity of GBF to struggling. As a result, routine GBF was maintained for a short period of time. Thus, environmental changes such as severe hypercapnia can indirectly impact GBF through altered struggling behaviour, but the implications of the overall reduction in GBF to food assimilation have yet to be established.</div>
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Gut blood flow in fish during exercise and severe hypercapnia.

Gut blood flow in fish during exercise and severe hypercapnia.

Source :

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

Pour générer des pages wiki