. Commercial fisheries review. Fisheries; Fish trade. BCF LOOKS FOR BLUEFIN TUNA "Bluefin tuna are great travelers," con- fides BCF La Jolla, Calif. Fish tagged and released in the California fishery have been recaptured several years later off Japan. During late spring, the bluefin visit the waters off southern Baja California. In 1969, fishermen caught 7,500 tons of the highly prized fish. Waiting for the bluefin this year as they approached the coast were oceanographers and fishery biologists of the BCF La Jolla laboratory and the Scripps Tuna Oceanogra- phy Research program
. Commercial fisheries review. Fisheries; Fish trade. BCF LOOKS FOR BLUEFIN TUNA "Bluefin tuna are great travelers," con- fides BCF La Jolla, Calif. Fish tagged and released in the California fishery have been recaptured several years later off Japan. During late spring, the bluefin visit the waters off southern Baja California. In 1969, fishermen caught 7,500 tons of the highly prized fish. Waiting for the bluefin this year as they approached the coast were oceanographers and fishery biologists of the BCF La Jolla laboratory and the Scripps Tuna Oceanogra- phy Research program (STOR). They had left San Diego on April 13 aboard BCF's 'David Starr Jordan', led by Dr. Maurice Blacliburn of STOR, on a 21-day, 4,100-mile cruise. Its purpose, explained Dr. Alan R. Longhurst, director of BCF La Jolla, was to give the tuna industry up-to-date information on the ocean- ographic mechanisms that determine routes of bluefin tuna into the coastal region- -hence, the location the fishery would open in 1970. Equipment Used Ninetypercentof bluefin tuna are caught in 62°-70O F. water, beginning in late May each year. Almost nothing else is known about their environmental preferences. The scientists hoped to locate offshore bluefin by longlining, basing the fishing tracks on the long-term mean position of the 62° and 70 isotherms. They were using a battery of oceanographic, biological, and meteorologi- cal instruments to measure the ocean envi- ronment--and to attempt to relate findings to tuna fishery. Early Information Important The information on bluefin distribution weeks before they normally reach Baja Cali- fornia has immediate practical value to tuna fishermen. These fishermen were look- ing for alternate resources because the yel- lowfin tuna quota had been filled for 1970. Locations of any bluefin catches would be ra- dioed to La Jolla by the David Starr Jordan. The information would be passed on to south- ern California tuna Please note th
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