378 
PACIFIC SCIENCE, Vol. XI, October, 1957 
TABLE 4 
NUMBER OF GIANT TREMATODES IN STOMACHS OF WAHOO, BY HOST SIZE 
FREQUENCY OF OCCURRENCE BY HOST SIZE (CM.) 
OF WORMS 
PRESENT 
100- 
-119.9 
120- 
-139.9 
140-159.9 
160-179.9 
No. 
* 
No. 
« 
No. 
% 
No. 
% 
0 
3 
2.4 
1 
1.4 
1 
7 
5.7 
7 
9.7 
1 
7.7 
2 
10 
90.9 
90 
72.6 
41 
56.9 
3 
23.1 
3 
19 
15.3 
12 
16.7 
1 
7.7 
4 
1 
9.1 
3 
2.4 
8 
11.1 
6 
46.2 
5 
1 
0.8 
1 
1.4 
1 
7.7 
6 
1 
0.8 
1 
7.7 
8 
1 
1.4 
17 
1 
1.4 
Total 
11 
100.0 
124 
100.0 
72 
100.0 
13 
100.1 
stages of maturity present. The number of 
mature eggs in a single female was es- 
timated at over six million. 
4. The wahoo taken close to the islands 
showed little variety in their diet as judged 
by stomach contents. Of the identifiable 
food material the main items were mackerel 
scad, skipjack, and squid. 
5. An examination of size frequency distribu- 
tions from the Line Islands area revealed 
that the females attain a larger size than 
the males, and there is some suggestion 
that the two sexes grow at different rates. 
No attempt to estimate growth by modal 
progression is made since there are indica- 
tions that the samples were not representa- 
tive of a homogeneous population unit. 
6. A length-weight relationship for wahoo 
from the Line Islands is given by the 
equation: 
Log weight (pounds) = —9-4199 + 
3.50583 log length (millimeters). 
7. The wahoo was found to be parasitized by 
trematodes, nematodes, and copepods. 
REFERENCES 
Bates, D. H., Jr. 1950. Tuna trolling in the 
Line Islands in the late spring of 1950. 
U. S. Fish and Wildlife Serv ., Fisher. Leaflet 
351: 1-32. 
Chapman, W. M. 1946. Observations on 
tuna-like fishes in the tropical Pacific. Calif. 
Fish and Game 32(4): 165-170. 
Clark, F. N. 1934. Maturity of the California 
sardine ( Sardina caerulea ) , determined by 
ova diameter measurements. Calif. Dept. 
Fish and Game , Fish Bui . 42: 1-49. 
Fowler, H. W. 1938. The fishes of the George 
Vanderbilt South Pacific Expedition, 1937. 
Acad. Nat. Sci. Phila ., Monog. 2: 1-349. 
Hosaka, E. Y. 1944. Sport Fishing in Hawaii. 
ix + 198 pp. Bond’s, Honolulu. 
Iversen, E. S. 1955. Size frequencies and 
growth of central and western Pacific big- 
eye tuna. U. S. Fish and Wildlife Serv., Spec . 
Sci. Rpt., Fisheries 162: 1-40. 
Jenkins, O. P. 1904. Report on collections of 
fishes made in the Hawaiian Islands with 
descriptions of new species. U. S. Fish 
Comn., Bui. (1902) 22: 417-511. 
June, F. C. 1953. Spawning of yellowfin tuna 
in Hawaiian waters. U. S. Fish and Wildlife 
Serv., Fisher. Bui. 54(77): 47-64. 
Kishinouye, K. 1923. Contributions to the 
comparative study of the so-called Scom- 
broid fishes. Tokyo Imp. Univ., Col. Agr. 
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