JACK MACKEREL EGGS, PACIFIC COAST, 1951-1954 



This report contains the results of quantitative sampling of eggs of 

 jack mackerel, Trachurus symmetricus . for the years 1951 through 1954. This 

 report may be considered as an extension of information given by Ahlstrom 

 (1953 and 1954) and Ahlstrom and Kramer (1955 and 1956). 



The plankton hauls from which the eggs were taken were made at monthly 

 intervals by agencies participating in the California Cooperative Oceanic 

 Fisheries Investigations which is sponsored by the California Marine Research 

 Committee, and which comprises the following organizations: The Scripps 

 Institution of Oceanography of the University of California, the California 

 Department of Fish and Game, the Hopkins Marine Station of Stanford Uni- 

 versity, the California Academy of Sciences and the South Pacific Fishery 

 Investigations of the U. S. Fish and Wildlife Service. 



The data are presented in six tables: 



la. Monthly totals of jack mackerel eggs for 1951-1954. 



lb. Regional distribution of jack mackerel eggs for 1951-1954, 



2. Jack mackerel eggs by stage for selected stations in 1951. 



3. Jack mackerel eggs for 1951. 



4. Jack mackerel eggs for 1952. 



5. Jack mackerel eggs for 1953. 



6. Jack mackerel eggs for 1954. 



These tables give the standard numbers of eggs (see below). 



The author wishes to express his gratitude to Dr. E. H. Ahlstrom for the 

 aid given in identifying the material, and assistance in the preparation of 

 this manuscript. Mr. James R. Thrailkill has prepared the figures. The 

 Staff, South Pacific Fishery Investigations have contributed materially to 

 the routine tasks associated with the collection and preliminary processing 

 of the data. My wife, Paula Farris, has helped with the laborious proof- 

 reading of this report. 



