450 
i 1 
Fig. 3. Scomberomorous sierra, 12 mm long; 
dorsal view of the head. Specimen caught off Punta 
Foca, Peru. 
PACIFIC SCIENCE, Vol. XX, October 1966 
stages or both come to hand, or until research 
on the seasonal development of the gonads is 
carried out. 
ACKNOWLEDGMENTS 
This report is possible only because many in- 
dividuals and institutions were willing to pro- 
vide me with the material and data on which 
this study is based. Their cooperation is grate- 
fully acknowledged. I am particularly grateful 
to Dr. E. H. Ahlstrom for loaning the speci- 
mens from plankton tows made by the staff 
members of the organization now known as 
the California Current Resources of the United 
States Bureau of Commercial Fisheries. My 
special thanks go to Mr. Harold B. Clemens, 
California State Fisheries Laboratory, San 
Pedro, California. Mr. Clemens not only pro- 
vided the numerous specimens and the data 
gathered by him and his colleagues but also 
contributed to this paper by discussing the 
subject with me at various stages of preparation 
of the manuscript. 
REFERENCES 
Berdegue A., Julio. 1956. Peces de impor- 
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de Mexico. Comision para el Fomento de la 
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Clemens, Harold B. 1956. Rearing larval 
scombroid fishes in shipboard aquaria. Calif. 
Fish and Game 42(1) : 69-79. 
Collette, B. B., F. H. Talbot, and R. H. 
Rosenblatt. 1963. The first California 
record of sierra, Scomberomorus sierra Jordan 
and Starks. Calif. Fish and Game 49(1) :53- 
54. 
Earll, R. Edward. 1882. The Spanish mack- 
erel, Cyhium maculatum (Mitchill) Agassiz; 
its natural history and artificial propagation, 
with an account of the origin and develop- 
ment of the fishery. Rept. U. S. Commis- 
sioner Fish and Fisheries, 1880 (1883) : 395— 
426. 
Eckles, Howard H. 1949. Observations on 
juvenile oceanic skipjack ( Katsuwonus pe la- 
mis) from Hawaiian waters and sierra mack- 
erel ( Scomberomorus sierra) from the east- 
