40 



Fishery Bulletin 101(1) 



to females were recovered during 1999; one was released 

 during summer 1996, the other two were released during 

 summer 1997. 



Mean size for males was 250.0 mm (SD=32.1) for wild 

 fish and 257.1 mm (SD=24.8) for hatchery-reared fish; 

 mean size for hermaphrodites was 275.0 mm (SD=27.5) 

 for wild fish and 267.2 mm (SD=43.3) for hatchery-reared 

 fish; mean size for females was 315.6 mm (SD=39.2) 

 for wild Pacific threadfin and 311.3 mm (SD=57.1) for 

 hatchery-reared threadfin (Table 6). The GSI for hatchery- 

 reared males (.v=0.629, SD=0.728) was not significantly 

 different (7=6524, P=0.073) than the GSI for wild males 

 (.v=0.619, SD=0.842), likely because of the larger size of 

 hatchery-reared males during 1999. Number of hatchery- 

 reared females and hermaphrodites was too low for statis- 

 tical comparisons. 



Condition factor for hatchery-reared Pacific threadfin 

 during 1999 was not significantly different between re- 

 lease sites (F=0.074, df=l, 79, P=0.786) or among release 

 sizes (F=1.488, df=3, 79, P=0.224). Therefore, condition 

 factors for ail hatchery-reared fish were pooled and com- 

 pared to condition factors for all wild fish recovered in 

 1999. No significant difference was found in condition fac- 

 tors between the.se two groups ( 7=47733.0, P=0.087). 



Discussion 



Cultured Pacific threadfin juveniles released into the ocean 

 survived and recruited successfullv into the recreational 



Sex 



Figure 5 



Sex ratio for wild and hatchery-reared Pacific threadfin 

 returned for the 1999 reward fishing sea.son. Values are 

 total number offish in each sex category. 



fishery, accounting for Wf and 8*^; of the catch on the 

 windward side of the island of Oahu in two years ( 1998 and 

 1999, respectively). Hatchery fish from the 1997 release 

 constituted the majority of the hatchery fish returns to the 

 recreational fishery in 1998 (89.4':^ ) and 1999 (95.9'^; ). Few 

 of the hatchery fish released in years prior to 1997 have 

 been recovered from the recreational fishery. The large 



