10° 



I0< 



20° 



30< 



140° 



150° 



160° 



170° 



180° 



"5. . 



180 days 





AUSTRALIA 



10° 



0° 



10° 



20° 



^J30° 

 180° 



140° 150° 160° 170° 



Figure 6. — Movements of black marlin tagged off Queensland, Australia. 



longliner 364 days after tagging about 90 nautical 

 miles north from the point of tagging near Hope 

 Reef, Queensland, Australia. The second was re- 

 covered 180 days after tagging by a Taiwanese long- 

 liner 1.440 nautical miles northeast of the tagging 

 site at Escape Reef, Queensland, Australia. 



MIGRATION RATES AND TIMES 



The speed of migration of striped marlin, ex- 

 pressed in nautical miles per day projected on a 

 straight line/time basis, varies considerably be- 

 tween local and distant water recoveries (Fig. 7). 

 For billfishes tagged off the Baja California/ 

 Mazatlan area the average time at liberty was 94 

 days. An average distance of 176 nautical miles 

 traveled equals 1.9 nautical miles per day. Striped 

 marlin tagged off southern California recovered 

 near the tip of Baja California had an average re- 

 lease time of 52 days and a migration rate of 12.3 

 nautical miles per day. Other long distance migra- 

 tion rates are as follows; southern California to 

 southwest of the Hawaiian Islands, 26.0 nautical 



Figure 7. — General migration patterns of striped marlin 

 tagged off southern California and Mexico. 



234 



