THE vessel used for the annual oceanographical investigations in the Lofoten area (the Johan Hjort) had a Hughes echo sounding gear (magnetostriction system, frequency 16,000 cycles per second) installed before leaving Bergen last February. The gear worked smoothly all along the coast and besides furnishing a great number of interesting sections, revealed many features hitherto unsuspected; among others, that the clay flooring of deep fjords is invariably about 10 m. thick and generally very flat.
About this article
Cite this article
SUND, O. Echo Sounding in Fishery Research. Nature 135, 953 (1935). https://doi.org/10.1038/135953a0
Reviews in Fish Biology and Fisheries (2018)