. Commercial fisheries review. Fisheries; Fish trade. 19. Fig. 3 - A modified example of special ASWEPS overflight charts received by radiofacsimile aboard the M/V Delaware during Cruise 67-2. Sea surface temperatures (Fahrenheit) on this chart are primarily interpreted from infrared radiation readings during the flight of March 28, 1967 (track shown by dashed line). Starting position of the Delaware's six longllne stations are numbered. Observed temperatures from tiie vessel on March 28 and 29 (Stations 3 and 4) agree closely with the aircraft data. Bigeye tuna (Thunnus obesus) were found at
. Commercial fisheries review. Fisheries; Fish trade. 19. Fig. 3 - A modified example of special ASWEPS overflight charts received by radiofacsimile aboard the M/V Delaware during Cruise 67-2. Sea surface temperatures (Fahrenheit) on this chart are primarily interpreted from infrared radiation readings during the flight of March 28, 1967 (track shown by dashed line). Starting position of the Delaware's six longllne stations are numbered. Observed temperatures from tiie vessel on March 28 and 29 (Stations 3 and 4) agree closely with the aircraft data. Bigeye tuna (Thunnus obesus) were found at 3 stations and were associated with the same environmental structures as yellowfin tuna. Average weight of bigeye taken at Sta- tions 2 and 5 (see positions on preceding page) was 109 pounds. A single, small, big- eye weighing 20 pounds was taken at Station 6(37°40' N. Lat., 67°20' W. Long.). The only albacore (Thunnus alalunga) caught during the cruise was found at Station 4 (37°34' N. Lat., 69013' W. Long.) and weighed 52 pounds. Catches of swordfish (Xiphias gladius) were minimal in the environment fished. The 2 stations of capture also had the highest catches of yellowfin tuna. With the exception of one 210-pound male at Station 2, all sword- fish were under 100 pounds. Heavy shark catches were encountered at 4 stations. Shark mutilation to tunas and swordfish was not significant, although 100 hooks and considerable time were lost due to frequent snarls and parting of gear. New Expendable XBT Tested A newly installed expendable bathyther- mograph system (XBT) was tested to obtain rapid and accurate profiles of vertical ther- mal structure. Disregarding 3 human errors, percent of 85 XBT operations were suc- cessful. Immediate availability of vertical temperature data from this system, com- bined with surface temperature data from radiofacsimile charts and recording ther- mographs, facilitated maneuvers of the ves- sel into desired thermal environments for successful
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