Fishes of the Western North Atlantic 513 



Table VI. Average Lengths (mm)* of S. alpinus at Different Ages for Localities in 

 North America, Greenland, and Spitsbergen 



Labrador Herschel I. Frobisher Bav •,■,, r^ i , c • 



Ages'* Northwestern ^ Hebron to Arctic Baffin ' W Greenland Sp.ts- 



8 Hudson Bayt ^j^^^^j^^^^ ^anada^ Island" L""''""'" ''"^'^"^ 



5 382 — 246+ 130 201-224 369 



6 408 — 362+ 139 237-258 412 



7 446 412-449 407+ 172 275-310 483 



8 468 423-557 425+ 302 268-525 533 



9 494 442-576 421+ 337 430-546 611 



10 524 472-584 524+ 363 480-554 670 



II 567 478-626 557+ 414 489-571 700+ 



12 597 495-626 — 425 519-550 — 



13 638 503-656 — 484 530-606 — 



14 636 608+ — 510 — — 



15 — 671+ — 553 — — 



16 682+ 764+ — 557 605 — 



17 791 — — 559 — — 



18 750+ — — 600 — — 



19 _ _ _ 613 — — 



20 — — — 649 — — 



21 — — — 642 — — 



22 822+ — — 655 — — 



23 — — — 678 — — 



24 — — — 678 — — 



24+ — — — 685 — — 



* Measurements for Labrador and Frobisher Bay fish were given as fork length (snout to fork of caudal 

 fin); those for Herschel Island, originally given as standard length, have been adjusted here to fork length by 

 adding 90/0 of the standard length given. The standards of measurement were not stated for either western 

 Greenland or Spitsbergen. 



** Ages for Hudson Bay, Labrador, western Greenland, and Spitsbergen were given in years, those for 

 Frobisher Bay and Herschel Island in "winters." Those for Labrador, Frobisher Bay, Herschel Island, and 

 western Greenland were derived from studies of the otoliths, those for Hudson Bay and Spitsbergen from 

 studies of the scales. 



t Sprules, 62: 8, tab. 2. ft Andrews and Lear, 2: 851. a Grainger, 28: 341-348. A Hansen 

 in 28: 354, 369. /S Dahl, II: 1-12. + One fish only. 



water and to a more abundant food supply) than those to be expected among the anadro- 

 mous populations with which we are immediately concerned. 



The average lengths reached at equal ages by the Arctic Charr at different local- 

 ities are summarized in Table vi. Although the data are not strictly comparable (see 

 Table vi, footnotes), it seems evident from these data, added to other available informa- 

 tion, that: (i) "the char[r] grow very slowly and may reach an age of more than 

 24 years" {28: 327); (2) the rate of growth varies widely from place to place, even 

 within short distances, both for Labrador and for the western Greenland coast; and 

 (3) sea-run Arctic Charr grow considerably faster along the Atlantic coast of Labrador, 

 in the Hudson Bay region, near Herschel Island, along the coast of western Greenland, 

 and at Spitsbergen than they do in Frobisher Bay, Baffin Island. Grainger has pointed 

 out also that those within a given age class may vary widely in size, irrespective 



