Vertical and horizontal movements of striped marlin (Tetrapturus audax) near the Hawaiian Islands,determined by ultrasonic telemetry,with simultaneous measurement of oceanic currents |
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| Authors: | R W Brill D B Holts R K C Chang S Sullivan H Dewar F G Carey |
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| Institution: | (1) Honolulu Laboratory, Southwest Fisheries Science Center, National Marine Fisheries Service, NOAA, 2570 Dole Street, 96822-2396 Honolulu, Hawaii, USA;(2) La Jolla Laboratory, Southwest Fisheries Science Center, National Marine Fisheries Service, NOAA, 92038 La Jolla, California, USA;(3) Physiological Research Laboratory, Scripps Institution of Oceanography, University of California at San Diego, 92093 La Jolla, California, USA;(4) Woods Hole Oceanographic Institution, 02543 Woods Hole, Massachusetts, USA |
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| Abstract: | We measured the vertical and horizontal movements of striped marlin (Tetrapturus audax) off the leeward coast of the Island of Hawaii between 20 November and 18 December 1992 while simultaneously gathering data on water temperature and oceanic currents. Fish movements were monitored by ultrasonic depth-sensitive transmitters, depth-temperature profiles by an expendable bathythermograph system, and oceanic current patterns by an acoustic Doppler current profiler. Like Indo-Pacific blue marlin (Makaira mazara), striped marlin near Hawaii spend >85% of their time in the mixed layer (i.e., above 90 m depth). The maximum depth for striped marlin appears to be limited by water temperatures 8 C° colder than the mixed layer, rather than by an absolute lower temperature. We also found that the horizontal displacements of some striped marlin can be strongly influenced by currents. |
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