Horodysky and Graves: Estimation of survival of Tetrapturus albidus caught and released in the North Atlantic recreational fishery 91 



o 

 -10 



•20 

 •30 

 •40 

 ■50 

 -60 



05 1 6 02 



B 



6 12 1 

 05/17/02 



6 12 

 05/1 9/02 



Figure 4 



Track of DR02-04 showing mortality 64 hours after release: (A) the first 20 hours following 

 release, (B) the next 40 hours showing behavior similar to other surviving tagged marlin, and 

 (C) the four hours prior to mortality. 



10-day PSATs moved an average of 101 (±84) nautical 

 miles (nmi) or 188 km (±155) and those tagged with 

 5-day PSATs moved an average of 38.8 nmi (±15.6) or 

 72 km (±29). 



Discussion 



The results of this study clearly indicate that hook 

 type significantly affects the survival of white marlin 

 released from recreational fishing gear. White marlin 

 caught on circle hooks were much more likely to survive 

 release from recreational fisheries than those caught on 

 straight-shank ("J") hooks. These results concur with 



previous research across a broad range of fishes caught 

 by diverse recreational fishing techniques (Muoneke 

 and Childress, 1994; Diggles and Ernst, 1997; Lukaco- 

 vic and Uphoff, 2002; Malchoff et al., 2002; Skomal et 

 al., 2002; Zimmerman and Bochenek, 2002). However, 

 the results of our study differ with those of Domeier 

 et al. (2003), who noted differences in deep-hooking 

 and bleeding between striped marlin caught on circle 

 hooks and those caught on "J" hooks but did not detect 

 a significant difference in mortality between hook types. 

 Differences between the two studies may result from a 

 disparity in body size between the two species, specific 

 bait types (white marlin were caught on dead baits in 

 the present study, Domeier et al. [2003] used live baits), 



