Hypoxial examination of Anodonta cygnea L. on the O₂-consumption of gill-tissues and the relation between body dimensions and the respiration of the gill-tissue

Lukacsovics, Ferenc (1966) Hypoxial examination of Anodonta cygnea L. on the O₂-consumption of gill-tissues and the relation between body dimensions and the respiration of the gill-tissue. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 33. pp. 79-94. ISSN 0365-3005

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Abstract

Fresh-water mussel (Anodonta cygnea L.) specimens were kept under hypoxial conditions and the effect of hypoxia was measured on the respiration of gill tissues in the winter months (October, November, December). The measurements were conducted on the gills after different periods of hypoxia immediately or after 1—4 days of aeration respectively. It was further examined how far the oxygen consumption per 100 mg dry matter of the gill slices of a total of about 1500 sq.mm changes with the increase of the body dimensions (shell length) of the mussel. Results obtained were as follows: 1. In the months of October-December the mussels, with a high (about 95 per cent) mortality tolerated the hypoxial medium for no more than 3 days. 2. Irrespective of the 1-3 day period of hypoxia in the first hours the respiration values still lagged below the control level. 3. The isolated gills of the mussels which were only for 1 day in hypoxial environment reached the oxygen consumption values of the control only after 4 days of aeration; i. e. one day of hypoxia did not result in a measurable oxygen deficit. 4. When the mussels were kept hypoxially for 2 days and then placed into aerated water for 1 day, the oxygen consumption of their isolated gills was more intensive than that of the control, i. e. signs of replacement of the oxygen deficiency suffered appeared, which phenomenon was measurable also on the 2nd 3rd and 4th day. 5. The gills of the mussels kept hypoxially for 3 days exhibited a restitution only after 2 days of aeration and also on the further days remained above the control values. the measurement decreased by about 13 per cent which is presumably a seasonal effect. 7. Determination of the oxygen consumption values of Anodonta cygnea specimens of 14, 15, 18 and 20 cm shell length revealed that with increasing body dimensions the intensity of respiration related to the surface and weight unit diminished by 26 per cent per 2 cm.

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