UNITED STATES DEPARTMENT OF THE INTERIOR 

 U.S. Fish and Wildlife Service 



BUREAU OF COMMERCIAL FISHERIES 



Maturity and Spawning of Skipjack Tuna 



( Katsuwonus pelamis ) in the Atlantic Ocean, 



with Comments on Nematode 



Infestation of the Ovaries 



By 



DAVID C„ SIMMONS 



Contribution No. 83, Bureau of Commercial Fisheries Tropical 

 Atlantic Bioloicgal Laboratory, Miami, Fla. 33149 



United States Fish and Wildlife Service 

 Special Scientific Report.-Fisheries 580 



Washington, D. C. 

 January 1969 



