Hypercapnia adversely affects postprandial metabolism in the European eel (Anguilla anguilla)

C. Methling, Per Bovbjerg Pedersen, John Fleng Steffensen, Peter Vilhelm Skov

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The present study examined the effects of elevated CO2 partial pressure on the specific dynamic action (SDA) and ammonia excretion in European eel (Anguilla anguilla) following forced feeding. Two different hypercapnic scenarios
were investigated; one inwhich pCO2 oscillated between 20 and 60 mm Hg over 24 hour cycles, and one in which pCO2 was constant at 60 mm Hg. Since high CO2 results in low pH with unchanged alkalinity, a normocapnic group at low pH (pCO2 ≈ 3 mm Hg, pH = 6.5) was included to investigate possible direct effects
of pH. Constant hypercapnia (60 mm Hg) and lowpH (pH = 6.5) both significantly increased the duration of the SDA response by 22% and 29%, respectively.Hypercapnia had no effect on standard metabolic rate,while constant
or oscillating hypercapnia significantly lowered the maximum metabolic rate compared to controls, causing a significant reduction of the aerobic scope during constant hypercapnia. Under conditions of oscillating pCO2, the temporal and spatial postprandial increase in ammonia nitrogen excretion was significantly reduced. This group also excreted significantly less ammonia after ingesting a meal. No significant effects on the magnitude or duration of postprandial ammonia excretion were observed at high pCO2 or low Ph/normocapnia. The results demonstrate that despite an exceptional tolerance towards elevated pCO2 and acidosis, postprandial metabolic processes of the European eel are adversely affected by hypercapnia and low pH
Original languageEnglish
JournalAquaculture
Volume416
Pages (from-to)166-172
ISSN0044-8486
DOIs
Publication statusPublished - 2013

Keywords

  • Anguilla anguilla
  • Aquaculture
  • Hypercapnia
  • Specific dynamic action
  • Ammonia excretion

Cite this

@article{ed7edd0e04f6452888f85460fc251f0a,
title = "Hypercapnia adversely affects postprandial metabolism in the European eel (Anguilla anguilla)",
abstract = "The present study examined the effects of elevated CO2 partial pressure on the specific dynamic action (SDA) and ammonia excretion in European eel (Anguilla anguilla) following forced feeding. Two different hypercapnic scenarioswere investigated; one inwhich pCO2 oscillated between 20 and 60 mm Hg over 24 hour cycles, and one in which pCO2 was constant at 60 mm Hg. Since high CO2 results in low pH with unchanged alkalinity, a normocapnic group at low pH (pCO2 ≈ 3 mm Hg, pH = 6.5) was included to investigate possible direct effectsof pH. Constant hypercapnia (60 mm Hg) and lowpH (pH = 6.5) both significantly increased the duration of the SDA response by 22{\%} and 29{\%}, respectively.Hypercapnia had no effect on standard metabolic rate,while constantor oscillating hypercapnia significantly lowered the maximum metabolic rate compared to controls, causing a significant reduction of the aerobic scope during constant hypercapnia. Under conditions of oscillating pCO2, the temporal and spatial postprandial increase in ammonia nitrogen excretion was significantly reduced. This group also excreted significantly less ammonia after ingesting a meal. No significant effects on the magnitude or duration of postprandial ammonia excretion were observed at high pCO2 or low Ph/normocapnia. The results demonstrate that despite an exceptional tolerance towards elevated pCO2 and acidosis, postprandial metabolic processes of the European eel are adversely affected by hypercapnia and low pH",
keywords = "Anguilla anguilla, Aquaculture, Hypercapnia, Specific dynamic action, Ammonia excretion",
author = "C. Methling and Pedersen, {Per Bovbjerg} and Steffensen, {John Fleng} and Skov, {Peter Vilhelm}",
year = "2013",
doi = "10.1016/j.aquaculture.2013.09.014",
language = "English",
volume = "416",
pages = "166--172",
journal = "Aquaculture",
issn = "0044-8486",
publisher = "Elsevier",

}

Hypercapnia adversely affects postprandial metabolism in the European eel (Anguilla anguilla). / Methling, C.; Pedersen, Per Bovbjerg; Steffensen, John Fleng; Skov, Peter Vilhelm.

In: Aquaculture, Vol. 416, 2013, p. 166-172.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Hypercapnia adversely affects postprandial metabolism in the European eel (Anguilla anguilla)

AU - Methling, C.

AU - Pedersen, Per Bovbjerg

AU - Steffensen, John Fleng

AU - Skov, Peter Vilhelm

PY - 2013

Y1 - 2013

N2 - The present study examined the effects of elevated CO2 partial pressure on the specific dynamic action (SDA) and ammonia excretion in European eel (Anguilla anguilla) following forced feeding. Two different hypercapnic scenarioswere investigated; one inwhich pCO2 oscillated between 20 and 60 mm Hg over 24 hour cycles, and one in which pCO2 was constant at 60 mm Hg. Since high CO2 results in low pH with unchanged alkalinity, a normocapnic group at low pH (pCO2 ≈ 3 mm Hg, pH = 6.5) was included to investigate possible direct effectsof pH. Constant hypercapnia (60 mm Hg) and lowpH (pH = 6.5) both significantly increased the duration of the SDA response by 22% and 29%, respectively.Hypercapnia had no effect on standard metabolic rate,while constantor oscillating hypercapnia significantly lowered the maximum metabolic rate compared to controls, causing a significant reduction of the aerobic scope during constant hypercapnia. Under conditions of oscillating pCO2, the temporal and spatial postprandial increase in ammonia nitrogen excretion was significantly reduced. This group also excreted significantly less ammonia after ingesting a meal. No significant effects on the magnitude or duration of postprandial ammonia excretion were observed at high pCO2 or low Ph/normocapnia. The results demonstrate that despite an exceptional tolerance towards elevated pCO2 and acidosis, postprandial metabolic processes of the European eel are adversely affected by hypercapnia and low pH

AB - The present study examined the effects of elevated CO2 partial pressure on the specific dynamic action (SDA) and ammonia excretion in European eel (Anguilla anguilla) following forced feeding. Two different hypercapnic scenarioswere investigated; one inwhich pCO2 oscillated between 20 and 60 mm Hg over 24 hour cycles, and one in which pCO2 was constant at 60 mm Hg. Since high CO2 results in low pH with unchanged alkalinity, a normocapnic group at low pH (pCO2 ≈ 3 mm Hg, pH = 6.5) was included to investigate possible direct effectsof pH. Constant hypercapnia (60 mm Hg) and lowpH (pH = 6.5) both significantly increased the duration of the SDA response by 22% and 29%, respectively.Hypercapnia had no effect on standard metabolic rate,while constantor oscillating hypercapnia significantly lowered the maximum metabolic rate compared to controls, causing a significant reduction of the aerobic scope during constant hypercapnia. Under conditions of oscillating pCO2, the temporal and spatial postprandial increase in ammonia nitrogen excretion was significantly reduced. This group also excreted significantly less ammonia after ingesting a meal. No significant effects on the magnitude or duration of postprandial ammonia excretion were observed at high pCO2 or low Ph/normocapnia. The results demonstrate that despite an exceptional tolerance towards elevated pCO2 and acidosis, postprandial metabolic processes of the European eel are adversely affected by hypercapnia and low pH

KW - Anguilla anguilla

KW - Aquaculture

KW - Hypercapnia

KW - Specific dynamic action

KW - Ammonia excretion

U2 - 10.1016/j.aquaculture.2013.09.014

DO - 10.1016/j.aquaculture.2013.09.014

M3 - Journal article

VL - 416

SP - 166

EP - 172

JO - Aquaculture

JF - Aquaculture

SN - 0044-8486

ER -