. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. FISHES OF THE GULF OF MAINE 419 even in the Gulf of Maine large cod shift their range in depth with the seasons, coming up into shoal water in autumn and winter as the temperature cools and sinking deeper again in spring when the surface warms. Breeding migrations.—With the first ripening of the sexual products the feeding and thermal migrations are annually interrupted by concentration on certain rather definite spawning grounds, which for the larger fish involves a journey inshore or t
. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. FISHES OF THE GULF OF MAINE 419 even in the Gulf of Maine large cod shift their range in depth with the seasons, coming up into shoal water in autumn and winter as the temperature cools and sinking deeper again in spring when the surface warms. Breeding migrations.—With the first ripening of the sexual products the feeding and thermal migrations are annually interrupted by concentration on certain rather definite spawning grounds, which for the larger fish involves a journey inshore or to the shoaler part of the banks, and the breeding and thermal migrations are combined in the case of those cod that winter west of Nantucket. Tagging —It is not known whether individual cod return year after year to spawn on any particular ground or whether they may visit one region in one season and another the next, nor has any attempt been made to trace the lines of dispersal which they follow in the northern parts of the Gulf of Maine when they are spent and recommence feeding. Apparently, however, tagged fish released at N UMBER OF FISHHECOYERID EASTOF WOODS HOLE 0 2 4 6 8 10 12 14 16 18 MUMBER OF FISH RECOVERED WEST OF W0005 HOLE 0 2 4 6 8 10 12 14 16 18. Fig. -Numbers of tagged cod released at Woods Hole in 1898-1901 that were subsequently recovered east and west of that point in different months Woods Hole after they had spawned (4,000 of them were liberated from December to February of three successive years 84 and 4 per cent were recovered), moved west at first, for a number were retaken along the southern shores of New England and of New York during December and January, while half a dozen were reported from New Jersey, but not one east of Woods Hole until March 27. In April and May, however, tagged fish were reported east of Woods Hole as well as west, and it was during these two months that most of the recoveries were made, chiefly off Rhod
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