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Structural and circulatory responses to hypoxia in the secondary lamellae ofSalmo gairdneri gills at two temperatures

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Summary

The first gill arch ofSalmo gairdneri was fixed from normoxic (O2 saturation of the water >90%) and hypoxic (O2 saturation 25–30% for 5 days) fish at 10 °C and 18 °C, and from fish after one-day recovery from hypoxia at 18 °C. The secondary lamellae of the gills were analysed with morphometric methods for structural, haemotological and circulatory changes. During hypoxia a marked vascular distension took place at both temperatures. At both temperatures the vascular distension coincided with a shortening of the diffusion distance (36% at 10 °C and 21% at 18 °C) and a swelling of the erythrocytes (60% at 10 °C and 42% at 18 °C). The effects of these changes on the oxygen uptake of the gills are discussed.

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Authors and Affiliations

  1. Department of Zoology, Division of Physiology, University of Helsinki, SF-00100, Helsinki 10, Finland

    Antti Soivio & Heikki Tuurala

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  1. Antti Soivio
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  2. Heikki Tuurala
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Soivio, A., Tuurala, H. Structural and circulatory responses to hypoxia in the secondary lamellae ofSalmo gairdneri gills at two temperatures. J Comp Physiol B 145, 37–43 (1981). https://doi.org/10.1007/BF00782591

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