UNITED STATES DEPARTMENT OF THE INTERIOR 



Stewart L. Udall, Secretary 



John A. Carver, Jr., Under Secretary 



Stanley A. Cain, Assistant Secretary for Fish and Wildlife and Parks 



FISH AND WILDLIFE SERVICE, Clarence F. Pautzke, Commissioner 



Bureau of Commercial Fisheries, Donald L. McKernan, Director 



Synopsis on the Biology of the Jack Mackerel 



(Trachurus symmetricus) 



By 

 JOHN S. MacGREGOR 



FAO Species Synopsis No. 86 



United States Fish and Wildlife Service 

 Special Scientific Report- -Fisheries No. 526 



Washington, D.C. 

 April 1966 



