CalCOFI  Reports, Vol. 2, 1952 Contents   Page INTRODUCTION 7   PART 1: THE SARDINE AND  ITS ENVIRONMENT,     YESTERDAY  AND TODAY 9   Distribution of Sardines 9   Eggs and Larvae 9 Young  Fish 9 Adult  Sardines 9 Subgroups 10 Numbers  of Sardines 12   Adult Sardine 12   The Total Population 12 Variations in Mortality Rates 13 Age Composition of the Catch 14 Size of Older Year Classes 14   Eggs, Larvae, and Young Fish 14   Spawning Surveys 14 Young  Fish 16 Habits and Behavior 22   Olfactory  Sense 22 School Patterns 22 Behavior in an Electrical Field 22 Food of the Sardine 23   Food of the Larvae             23 Food of the Adult              23 The  Environment               24   Oceanographic  Conditions 24 Relation of Oceanographic Conditions to Other Factors 33   Population Size                 33 Year-Class Size                  33 Mortality  Rates                  33 Fishing  Success                 33   The  Food Supply               37 Predators  and Competitors 37   Bacteria         37 Other  Fishes                        38 Future Studies 44   PART 2: THE OUTLOOK FOR THE FISHERY 45   APPENDIX:  TABULAR MATERIAL 47