1076 



U. S. BUREAU OF FISHERIES 



Table 3. — A sinnniary of the number of cod. pollock, and haddock tagged and 

 recaptured during the years 1923-1929, inclusive 



Data on the haddock and pollock were collected incidental to the 

 cod-tagging operations. So few of the tagged haddock and pollock 

 have been recaptured that very little can be said specifically con- 

 cerning their migrations. In general it appears that some adult 



Figure 2.— Tagging ;i codfish to study its migrations 



haddock and pollock ma}^ remain for a year or more in one immediate 

 locality, but both species seem more irregular in their movements 

 than the cod. Apparently a fair proportion of the haddock along 

 the coast of Maine immigrate to the region southeast of Cape Cod 

 (South Channel). Neither the haddock nor tlie pollock migrate 

 westward from Xantucket Shoals in the fall in sucli bodies as do the 

 cod. for onh' an occasional one of either species reaches New Jersey. 



MACKEREL 



The year 1020 Avas of unusual interest in the mackerel investiga- 

 tions. For the past four year? the mackerel population had consisted 

 almost entirely of the brood ratchod in 102:5, and since their peak 

 year in 1026 they had been p'*oviding definitely declining catches. 

 The paramount (juestion was whether a new brood would materialize 



