Excess posthypoxic oxygen consumption in rainbow trout (Oncorhynchus mykiss): recovery in normoxia and hypoxia
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Excess posthypoxic oxygen consumption in rainbow trout (Oncorhynchus mykiss) : recovery in normoxia and hypoxia. / Svendsen, Jon Christian; Steffensen, John Fleng; Aarestrup, Kim; Frisk, Michael; Etzerodt, Anne; Jyde, Mads.
In: Canadian Journal of Zoology, Vol. 90, No. 1, 2012, p. 1-11.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Excess posthypoxic oxygen consumption in rainbow trout (Oncorhynchus mykiss)
T2 - recovery in normoxia and hypoxia
AU - Svendsen, Jon Christian
AU - Steffensen, John Fleng
AU - Aarestrup, Kim
AU - Frisk, Michael
AU - Etzerodt, Anne
AU - Jyde, Mads
PY - 2012
Y1 - 2012
N2 - Under certain conditions, a number of fish species may perform brief excursions into severe hypoxia and return to water with a higher oxygen content. The term severe hypoxia describes oxygen conditions that are below the critical oxygen saturation (S(crit)), defined here as the oxygen threshold at which the standard metabolic rate becomes dependent upon the ambient oxygen content. Using rainbow trout (Oncorhynchus mykiss (Walbaum, 1792), this study quantified the excess posthypoxic oxygen consumption (EPHOC) occurring after exposure to oxygen availability below S(crit). Tests showed that S(crit) was 13.5% air saturation (O(2sat)). Fish were exposed to 10% O(2sat) for 0.97 h, and the EPHOC was quantified in normoxia (>= 95% O(2sat)) and hypoxia (30% O(2sat)) to test the hypothesis that reduced oxygen availability would decrease the peak metabolic rate (MO(2peak)) and prolong the duration of the metabolic recovery. Results showed that MO(2peak) during the recovery was reduced from 253 to 127 mg O(2).kg(-1).h(-1) in hypoxia compared with normoxia. Metabolic recovery lasted 5.2 h in normoxia and 9.8 h in hypoxia. The EPHOC, however, did not differ between the two treatments. Impeded metabolic recovery in hypoxia may have implications for fish recovering from exposure to oxygen availability below S(crit).
AB - Under certain conditions, a number of fish species may perform brief excursions into severe hypoxia and return to water with a higher oxygen content. The term severe hypoxia describes oxygen conditions that are below the critical oxygen saturation (S(crit)), defined here as the oxygen threshold at which the standard metabolic rate becomes dependent upon the ambient oxygen content. Using rainbow trout (Oncorhynchus mykiss (Walbaum, 1792), this study quantified the excess posthypoxic oxygen consumption (EPHOC) occurring after exposure to oxygen availability below S(crit). Tests showed that S(crit) was 13.5% air saturation (O(2sat)). Fish were exposed to 10% O(2sat) for 0.97 h, and the EPHOC was quantified in normoxia (>= 95% O(2sat)) and hypoxia (30% O(2sat)) to test the hypothesis that reduced oxygen availability would decrease the peak metabolic rate (MO(2peak)) and prolong the duration of the metabolic recovery. Results showed that MO(2peak) during the recovery was reduced from 253 to 127 mg O(2).kg(-1).h(-1) in hypoxia compared with normoxia. Metabolic recovery lasted 5.2 h in normoxia and 9.8 h in hypoxia. The EPHOC, however, did not differ between the two treatments. Impeded metabolic recovery in hypoxia may have implications for fish recovering from exposure to oxygen availability below S(crit).
U2 - 10.1139/Z11-095
DO - 10.1139/Z11-095
M3 - Journal article
VL - 90
SP - 1
EP - 11
JO - Canadian Journal of Zoology
JF - Canadian Journal of Zoology
SN - 0008-4301
IS - 1
ER -
ID: 37894291