448 
Fig. 5. Lateral view of skulls of juvenile albacore 
88 mm (top), 184 mm (center ) , and 257 mm (bot- 
tom) in standard length. 
PACIFIC SCIENCE, Vol. XIX, October 1965 
a yellowfin, and one in the stomach of a wahoo 
( Acanthocyhium solandri ) . 
The occurrence of juvenile albacore in the 
Pacific Ocean is shown in Figure 6. Previously 
juvenile albacore were recorded from 18°38 / N, 
151°26' E and 20°57' N, 149°36' E in the 
western North Pacific and 18°44' S, 176° 54' E, 
18°58 / S, 176°27' E and 20°50 / S, 155°20' E 
in the central and western South Pacific (Yabe 
et ah, 1958). The discovery of the 12 juvenile 
albacore reported here establishes a new east- 
ward distribution record for juveniles in the 
Pacific Ocean. The known distribution of juve- 
nile albacore now extends as far east as the 
Hawaiian Islands in the North Pacific and as 
far as 162° W longitude in the South Pacific. 
Although the number of specimens is small, 
the discovery of juvenile albacore in these areas 
supports the findings of past studies on alba- 
core spawning based on gonad condition and 
also provides positive evidence of spawning. It 
had been hypothesized that albacore in the 
North Pacific spawn in a broad area extending 
westward from the Hawaiian Islands (Ueya- 
nagi, 1957; Otsu and Uchida, 1959). Similarly, 
in the South Pacific ( also on the basis of gonad 
studies) Otsu and Hansen (1962) indicate that 
albacore may spawn in a broad area north of 
20° S. It can be seen in Figure 6 that juvenile 
TABLE 2 
Juvenile Albacore Found in Stomachs of Predators 
SPECIMEN 
NO. 
DATE 
LOCALITY 
STANDARD 
LENGTH 
PREDATOR 
1 
8-11-60 
23°46' N, 171°02' E 
131 mm* 
blue marlin 
2 
8-11-60 
23°46' N, 171 °02' E 
131 mm* 
blue marlin 
3 
2-25-62 
10°43' S, 178°46'E 
85 mm 
blue marlin 
4 
2-26-62 
13°25' S, 179°15' W 
61 mm* 
yellowfin 
5 
2-26-62 
13°25'S, 179° 15' W 
75 mm* 
yellowfin 
6 
3-13-62 
15°35'S, 171°16'W 
88 mm 
blue marlin 
7 
3-24-62 
06°32'S, 162°45'W 
74 mm 
wahoo 
8 
8- 1-62 
off Kona, Hawaii 
184 mm 
blue marlin 
9 
8-13-62 
off Waianae, Oahu 
135 mm* 
striped marlin 
10 
9-13-62 
off Waianae, Oahu 
184 mm* 
blue marlin 
11 
11- 2-62 
off Waianae, Oahu 
257 mm 
striped marlin 
12 
11- 2-62 
off Waianae, Oahu 
283 mm* 
striped marlin 
Estimated. 
