. Commercial fisheries review. Fisheries; Fish trade. The Pathfinder, one of the larger ocean survey vessels. The 4-month survey will benefit the in- creasing marine activity and economic de- velopment of Cook Inlet, one of Alaska's im- portant Internal Waves Under Study A 15-day probe of internal waves, mys- terious ocean phenomena that cause unusual behavior in underwater sound, is being made by oceanographers of ESSA and the Univer- sity of Washington. Internal waves, found in all the world's oceans, are at times larger than surface waves. Internal waves 270 feet high have been
. Commercial fisheries review. Fisheries; Fish trade. The Pathfinder, one of the larger ocean survey vessels. The 4-month survey will benefit the in- creasing marine activity and economic de- velopment of Cook Inlet, one of Alaska's im- portant Internal Waves Under Study A 15-day probe of internal waves, mys- terious ocean phenomena that cause unusual behavior in underwater sound, is being made by oceanographers of ESSA and the Univer- sity of Washington. Internal waves, found in all the world's oceans, are at times larger than surface waves. Internal waves 270 feet high have been measured in the Indian Ocean, while the highest surface wave ever reported was 112 feet. Sufficiently widespread to be a signif- icant factor in many ocean processes, they may serve as "an effective mechanism for transferring energy" fromi the surface into the deep ocean. They may also affect under- water acoustics, communication, detection, location, and mapping. 80 Miles Off Washington The investigation site is about 80 miles off Washington and British Columbia, where the continental shelf slopes down into the deep ocean. The oceanographers are testing a theory that some internal waves are generated by the surface tide at the end of the continental shelf. Internal waves are called internal tides. Navy Flyers Watch Sharks in Gulf Stream Airborne oceanographers of the U. S. Naval Oceanographic Office have been watching closely the wolves of the sea--sharks--along the northern edge of the Gulf Stream. The Oceanographic Office's publication, "Gulf Stream," states: "The Navy's interest in sharks stems from the threat they pose to survival at sea. ... In addition, sharks, or organisms upon which they prey, may inter- fere with underwater sound-ranging opera- tions" used by the Navy. From April 1966 to December 1967, the oceanographers recorded the following shark sightings: Season Number of Sharks Hours Observed Sharks Observed Per Hour Wint
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Keywords: ., book, bookcentury1900, booksubjectfisheries, booksubjectfishtrade
