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Circulatory changes in secondary lamellae of Salmo gairdneri gills in hypoxia and anaesthesia

Antti Soivio and George M. Hughes
Annales Zoologici Fennici
Vol. 15, No. 3 (1978), pp. 221-225
Stable URL: http://www.jstor.org/stable/23733688
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Circulatory changes in secondary lamellae of Salmo gairdneri gills in hypoxia and anaesthesia
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Abstract

The secondary lamellae of rainbow trout gills from hypoxic and anaesthetized fish were analysed stereologically for the blood volume and haematocrit value. In hypoxia the gills undergo vasodilatation, which is accompanied by slight haemodilution. When oxygen is available the situation changes; there is a tendency to vasoconstriction, but a continuing decrease in the haematocrit value. In anaesthesia the vasodilatation seen in the secondary lamellae is combined with haemoconcentration. During recovery vasodilatation continues, while the haematocrit value falls to below that of controls. Explanations for these observations are offered in terms of the circulation through the gills.

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