Assessments of Atlantic salmon stocks of salmon fishing areas 20 and 21, the Southern Upland of Nova Scotia, for 1999 / by P.G. Amiro, D.A. Longard and E.M. Jefferson. : Fs70-1/2000-009E-PDF
Assessment of the Atlantic salmon stocks of two Salmon Fishing Areas, SFA 20 on the eastern shore and SFA 21 on the southern shore of Nova Scotia indicated that returns in 1999 were insufficient to achieve conservation requirement in any index river. Returns to low-acidified index rivers were only 22% of the adult salmon requirement in the St. Marys River and 48% of the requirement for the area above Morgans Falls on the LaHave River. Generation-to-generation survival above Morgans Falls for the 1994 egg deposition year-class was again below replacement. Smolt to one-sea-winter survival of stocked hatchery smolts continued a declining trend since 1984 to 0.31% while survival to two-sea-winter salmon increased marginally to 0.17%. Wild smolt survival back to Morgans Falls decreased to 2.04%. The ratio of wild to hatchery returns for one-sea-winter salmon was 4.8, 5.0 and 6.6 for the 1996 to 1998 smolt classes. Low return rates to low-acidified rivers further constrain enhancement and restoration programs. Hatchery smolt return rates to partially acidified rivers has declined to 0.05% at East River Sheet Harbour and to 0.03% at Liscomb River. Total salmon count at the Liscomb River fishway was only 25 salmon, and only 33 salmon were counted at East River Sheet Harbour. Tusket River smolt and adult assessment data indicated that the proportion of adult salmon counted in fishways while operating in the assessment mode for a portion of the season as 76.3%. An estimate of 12,408 wild smolts was derived for Tusket River. The high production rate of 48 smolts per escaped salmon indicated that perhaps only the higher pH Carleton River was the origin of the wild smolts. Forecasts to two index rivers indicated a 65% chance of attaining the conservation requirement above Morgans Falls and a 33% chance for St. Mary's River in 2000.
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| Ministère/Organisme | Canada. Department of Fisheries and Oceans. Canada. Canadian Stock Assessment Secretariat. |
|---|---|
| Titre | Assessments of Atlantic salmon stocks of salmon fishing areas 20 and 21, the Southern Upland of Nova Scotia, for 1999 / by P.G. Amiro, D.A. Longard and E.M. Jefferson. |
| Titre de la série | Canadian Stock Assessment Secretariat research document, 1480-4883 ; 2000/009 |
| Type de publication | Série - Voir l'enregistrement principal |
| Langue | [Anglais] |
| Format | Électronique |
| Document électronique | |
| Note(s) | Includes bibliographical references (p. 25-26). |
| Information sur la publication | Ottawa : Fisheries and Oceans Canada, 2000. |
| Auteur / Contributeur | Amiro, P. G. Longard, D. A. Jefferson, E. M. J. |
| Description | 32 p. : fig., graphs, tables. |
| Numéro de catalogue |
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| Descripteurs | Fisheries resources Salt water fish Fishing area Fisheries management |