alexa Standard metabolic rate, critical oxygen tension and aerobic scope for spontaneous activity of trout (Salmogairdneri) in acidified water


Toxicology: Open Access

Author(s): Gordon R Ultsch, Margaret E Ott, Norbert Heisler

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1.The influence of ambient pH on the ability of carp and trout to take up oxygen was studied with the use of a flow-through respirometer.2.Parameters determined were the standard metabolic rate (SMR), the aerobic scope for spontaneous activity (SSA), and the critical oxygen tension (Pc), all at 15°C.3.Neither species showed any decrease in the SMR or the SSA in the pH range of 7.4–4.0.4.At pH 3.5, carp showed a decrease in SMR and SSA, but trout did not.5.At pH 3.0, carp exhibited a further decrease in SMR and SSA, but trout showed no decrease in SSA and no decrease in SMR when death was preceded by the establishment of SMR.6.Pc was determined at pH 8 and pH 4 and increased upon acidification for both species, changing from 22 mmHg at pH 8 for both species to 48 mmHg (carp) and 34 mmHg (trout) at pH4.

This article was published in Comparative Biochemistry and Physiology Part A: Physiology and referenced in Toxicology: Open Access

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