00000nam 2200000za 4500 9.804784 CaOODSP 20221107135508 cr ||||||||||| 150406s1998 oncdb ob f000 0 eng d CaOODSP eng eng fre n-cn--- Fs70-1/1998-126E-PDF Knoechel, R. Juvenile Atlantic salmon (Salmo salar L.) abundance in the Experimental Ponds Area relative to adult returns to the Gander River as an index of marine survival [electronic resource] : evidence for increased marine mortality in 1997 / R. Knoechel, P.M. Ryan and M.F. O'Connell. Ottawa : Fisheries and Oceans Canada, 1998. 10 p. : fig., graphs, maps, tables. Canadian Stock Assessment Secretariat research document, 1480-4883 ; 98/126 Includes bibliographical references (p. 5). A marine survival ratio index was calculated as the number of adult salmon returning to the Gander River divided by the total juvenile salmon populations in the Experimental Ponds Area at the headwaters of the river in the previous spring. This survival index increased more than four-fold in the first four years (1992-1995) following closure of the fishery in 1992. The index dropped moderately in 1996 and then precipitously to pre-closure levels in 1997, suggesting that there has been a sudden decrease in marine survival despite the continued closure of the commercial fishery in insular Newfoundland. It is thus unlikely that the Gander River conservation requirement of 21,828 spawners will be met in 1998. gccst Fisheries resources gccst Salt water fish gccst Fishing area gccst Fisheries management Ryan, P. M. (Patrick Michael) O'Connell, M. F. Canada. Department of Fisheries and Oceans. Canada. Canadian Stock Assessment Secretariat. Canadian Stock Assessment Secretariat research document, 1480-4883 ; 98/126 (CaOODSP)9.507740 PDF 382 KB https://publications.gc.ca/collections/collection_2015/mpo-dfo/Fs70-1-1998-126-eng.pdf