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Points from Foregoing Letters

    Naturevolume 135page962 (1935) | Download Citation



    THE addition of echo sounding gear to the Johan Hjort enabled that vessel to reveal unsuspected features of the flooring of deep fjords, and to locate swarms of spawning cod in the neighbourhood of Lofoten. These, writes Oscar Sund, were mainly in a layer of 10–12 metres thick at a constant depth where a somewhat lower oxygen concentration and greater acidity could also be detected.

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