, Volume 179, Issue 3, pp 359-368
Date: 07 Dec 2008

Oxygen consumption and blood flow distribution in perfused skeletal muscle of chinook salmon

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An isolated, perfused salmon tail preparation showed oxyconformance at low oxygen delivery rates. Addition of pig red blood cells to the perfusing solution at a haematocrit of 5 or 10% allowed the tail tissues to oxyregulate. Below ca. 60 ml O2 kg−1 h−1 of oxygen delivery (DO2), VO2 was delivery dependent. Above this value additional oxygen delivery did not increase VO2 of resting muscle above ca. 35 ml O2 kg−1 h−1. Following electrical stimulation, VO2 increased to ca. 65 ml O2 kg−1 h−1, with a critical DO2 of ca. 150 ml O2 kg−1 h−1. Dorsal aortic pressure fell to 69% of the pre-stimulation value after 5 min of stimulation and to 54% after 10 min. Microspheres were used to determine blood flow distribution (BFD) to red (RM) and white muscle (WM) within the perfused myotome. Mass specific BFD ratio at rest was found to be 4.03 ± 0.49 (RM:WM). After 5 min of electrical stimulation the ratio did not change. Perfusion with saline containing the tetrazolium salt 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) revealed significantly more mitochondrial activity in RM. Formazan production from MTT was directly proportional to time of perfusion in both red and WM. The mitochondrial activity ratio (RM:WM) did not change over 90 min of perfusion.

Communicated by I. D. Hume.