Correlation methods were employed in a statistical analysis of the relation between catch fluctuations and economic factors for the principal Canadian commercial species of the Atlantic and Pacific coasts. The results indicate that the major part of catch fluctuations are ascribable to economic factors in the cases of Atlantic herring, "sardines", and cod (tentative), and Pacific herring. Economic factors appear to have had no significant effect on the catches of Atlanta lobsters and Pacific halibut and salmon.