. Il bollettino biologico. Biologia; Zoologia; biologia; biologia marina. Influenza della temperatura sulla asfissia DI GIOVANI GOLDFISH (Carassius auratus L.) SOTTO VARIE TENSIONI DI OSSIGENO E DI ANIDRIDE CARBONICA F. E. J. FRY, V. S. NERO, E EDGAR C. BLACK Ontario Pishcrics Laboratorio di Ricerca, Università di Toronto, Canada e Dipartimento di Fisiologia, Università Dalhousic, Halifax, Canada introduzione nel loro lavoro preliminare sulla sensibilità di Ontario i pesci a biossido di carbonio come misurata dalla asphyxial tensione di ossigeno del pesce in contenitori sigillati contenenti vari- le unità organizzative delle concentrazioni di dissol

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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. INFLUENCE OF TEMPERATURE ON THE ASPHYXIATION OF YOUNG GOLDFISH (CARASSIUS AURATUS L.) UNDER VARIOUS TENSIONS OF OXYGEN AND CARBON DIOXIDE F. E. J. FRY, V. S. BLACK, AND EDGAR C. BLACK Ontario Pishcrics Research Laboratory, University of Toronto, Canada and Department of Physiology, Dalhousic University, Halifax, Canada INTRODUCTION In their preliminary work on the sensitivity of Ontario fishes to carbon dioxide as measured by the asphyxial tension of oxygen of fish in sealed jars containing vari- ous concentrations of dissolved carbon dioxide, Fry and Black (1938) observed a difference in the response of two sample groups of the minnow, Chrosomus eos. The group taken in the autumn from a cold stream near Toronto was found to be ap- preciably more sensitive than the group from a bog lake in Algonquin Park at the height of the summer warming. These data were subsequently published in a review (Fry, 1939). At that time there was no indication as to the cause of this difference since the two groups came not only from different parts of the country but also from dif- ferent habitats. Further measurements were made in Algonquin Park in 1939 when the work was continued into early fall. Some comparisons were made of curves showing sensitivity to carbon dioxide for the same species from the same locality at different times of year. The same effect was noted as for Chrosomus eos, although the data were rather scanty. Observations of the same sort were made again in 1940 and, in particular, material was gathered for the brown bullhead (Ameiurus ncbulosus}. The results are illustrated in Figure 1. There is an increased sensitivity in late summer or early fall when the water is cooling. These tests were carried out in water of the same temperature as that in which the animals were captured. Reasoning by analogy from the fact that cold water species such as the trout fail to take up oxygen in the presence of mu

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• bookauthorlilliefrankrat
• booksubjectbiology
• booksubjectzoology