Current measurements below the ice in Eclipse Sound

Velocity and direction of the current under the sea ice of the EcIipse Sound between Baffin lsland and Bylot Island were measured with specially developed devices and registered on a recorder. During the period of registration (May-June 1972) an easterly current of 5-7 cm/s superimposed by tidal and local influences (max. 12 cm/s) was found. In addition , measurements of friction between steelcone surfaces und corresponding conical ice bores are reported on. The plotted results show the influence of ice-temperature, surface quality and in some cases the influence of time.

Vertical distribution of relative numbers of the main groups of sound-scattering fishes in the Central Indian Ocean

Findings made in 31 catches with an Isaacs-Kidd midwater trawl in the light (09.00-16.00) and dark (21.00-04.00) periods of a day within a survey area of about 100 sq. miles with approximate center coordinates of 13°S and 78°E have been used to investigate vertical distribution of the main groups of sound-scattering fishes (35 species of the family Myctophidae and 16 species of other families). It has been shown that during daylight hours all fishes sink to depths deeper than 400 m. Data are presented concerning the fish population of night-time sound-scattering layers at depths of 70-150 m and about 400 m and of the daytime ones at depths of about 450 m.