Research Document - 2001/042

Status of Atlantic salmon (Salmo salar L.) in Middle Brook (SFA 5), Northeast Brook, Trepassey (SFA 9), and Northeast River, Placentia (SFA 10), Newfoundland, in 2000

By M.F. O'Connell, A. Walsh and N. M. Cochrane

Abstract

The status of Atlantic salmon stocks in 2000 was determined for Middle Brook in Salmon Fishing Area (SFA 5), Northeast Brook, Trepassey in SFA 9, and Northeast River, Placentia in SFA 10. Total returns of small salmon to Middle Brook in 2000 decreased from 1999 (11%), remained above the 1984-1989 (39%) and 1992-1996 (63%) means, but decreased slightly from the 1992-1999 mean (7%). Total returns of large salmon increased over 1999 and the means (45, 651, 1106, and 33%, respectively). Total returns of small salmon to Northeast Brook, Trepassey in 2000 decreased from 1999 and the 1984-1989 and 1986-1991 means (13, 20, and 14%, respectively) but increased over the 1992-1999 mean (8%). Total returns of large salmon followed a similar pattern but differed in magnitude (-22, -51, -29, and 5%, respectively). Total returns of small salmon to Northeast River, Placentia in 2000 increased over 1999 (57%) but decreased from the means (6, 8, and 33%, respectively); total returns of large salmon increased over 1999 and the means (54, 1138, 1258, and 103%, respectively). Conservation requirements in terms of both eggs and small salmon were achieved in all rivers in 2000. Smolt-to-adult survival for small salmon (repeat spawners included) for Northeast Brook, Trepassey in 2000 (adult year) was 5.8%, a slight improvement over the 5.5% observed in 1999, and low compared with the record high of 9.2% in 1996. Survival in terms of virgin grilse in 2000 was 5.4%. Egg-to-smolt survival for the 1995 spawning year-class was 0.47 (preliminary), an increase over the value of 0.43 for observed 1994. The 1995 year-class value however remained substantially below the high recorded for the 1992 year-class (1.09%) and was more in line with values observed prior to 1992.

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