IT. S. BUREAU OF FISHERIES 

 Table 2. — Catch of fish according to localities 



Table 3. — Number of recaptured fish reported up to December 31, 1925 



In addition to these there are 38 records of cod recaptured a second 

 time. No marked pollock or haddock were caught more than once, 

 with the single exception of pollock No. 16,418, which was taken a 

 second and a third time. 



The regions of Mount Desert and Platts Bank, Me., have proved 

 to be of unusual interest as experimental tagging grounds. Platts 

 Bank, an isolated ledge in the Gulf of Maine, has an area of about 

 35 square miles, a depth 29 to 50 fathoms, and hard bottom such as 

 cod prefer. Except for the north prong of Jeffreys Ledge, 11 miles 

 west, it is surrounded for many miles by soft bottom, which cod usu- 

 ally avoid, and depths of 60 to 100 fathoms. During June and July, 

 1925, 604 cod were tagged on Platts Bank, and by the middle of 

 November 13 per cent of these had been reported recaptured. This 

 relatively high percentage is remarkable when it is considered that 

 almost all recaptures were made by several Portland vessels fishing 

 there in October and November and by the Halcyon during 7 days' 

 tagging. 



Scale samples were taken from all cod tagged in 1925 as well as 

 from miscellaneous fishes. Over 10,000 scales, each from a different 

 fish tagged in 1924, have now been mounted for study. It is believed 

 that an analysis of these scales will give valuable data on the age, 

 with respect to size and rate of growth, of various stocks of cod, pol- 

 lock, and haddock along the New England coast. 



A preliminary report on the Nantucket Shoals cod is now in 

 course of preparation. This is practicable because it has been found 

 that the stocks of cod inhabiting this region have carried out migra- 

 tions of the same sort from year to year and that their lives differ 

 in several important respects from the lives of those occurring north 



