In the hope of throwing some light on their migratory habits 10998 haddock were tagged in the Gulf of Maine from 1923 to 1932 by the United States Bureau of Fisheries vessels Halcyon and Albatross II, during the course of cod marking experiments, made between the months of April and October. This paper gives an account of the recaptures reported from these tagged haddock, together with a brief discussion of rate of growth....