FISHERY BULLETIN: VOL. 78, NO. 2 



Figure 40. — Camnx sexfasciatus, 472 mm FL, 1.8 kg, Enewetak, Marshall Islands. 



Figure 41. — Gymnosarda unicolor, 645 mm FL, 3.6 kg, Enewetak, Marshall Islands. 



white tipped. A large species, Masuda et al. (1975) 

 recorded it to a length of 2.4 m. Unlike other large 

 tunas, in general, it occurs in relatively shallow 

 coastal water, often around coral reefs, and it read- 

 ily penetrates the deeper lagoons of atolls. 



Thirteen individuals were collected from 

 Enewetak which ranged from 550 to 1,350 mm FL 

 (3.2-35.4 kg). Seven caused no symptoms when 

 liver tissue was fed to mongooses; four produced a 

 reaction of 1, one was a 2, and one a 3. 



Three from Bikini, 737-940 mm FL, 6.4-11.8 kg, 

 were nontoxic. 



Hiatt and Brock (1948, after unpublished data 

 of J. Marr and O. Smith) stated that the scad, 



236 



Decapterus sanctaehelenae, was most frequently 

 encountered in the stomachs of dogtooth tunas in 

 the Marshall Islands. Schultz in Schultz and col- 

 laborators (1953) reported that D. muroadsi and 

 Caesio xanthonotus were regurgitated by Gym- 

 nosarda nuda ( = G. unicolor) which were caught 

 at Bikini. 



Five of 17 specimens from the Marshall Islands 

 taken during the survey had empty stomachs. The 

 others contained fishes, five of which were iden- 

 tified as: Naso brevirostris, N. vlamingii, Cir- 

 rhilahrus sp., Caesio sp., Pterocaesio sp. The two 

 prey specimens of Naso were large adults. The A'^. 

 vlamingii, taken from the largest G. unicolor, 

 measured 370 mm SL. 



