Habitat-based reference points for Saint John River Alewife, upstream of the Mactaquac dam

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Language of the publication
English
Date
2024
Type
Report
Author(s)
  • Canadian Science Advisory Secretariat
  • Canada. Department of Fisheries and Oceans. Maritimes Region
Publisher
Center for Science Advice (CSA), Maritimes Region, Fisheries and Oceans Canada, Bedford Institute of Oceanography

Alternative title

Habitat-based reference points for Saint John River Alewife

Abstract

Reference points were developed for the Saint John River Alewife stock subunit upstream of the Mactaquac Dam, in accordance with a previously peer-reviewed framework for the development of reference points for Alewife based on estimated nursery area and the median habitat carrying capacity per unit area. A nursery area of 58,676 acres, the sum of all habitat characterized as accessible or potentially accessible, was used to calculate reference points. This nursery area includes all accessible or potentially accessible nursery area above Beechwood, Tobique, and Tinker dams in New Brunswick. At 195 kg/acre, the spawning stock biomass in the absence of anthropogenic mortality (SSB0) was calculated to be 11,400,000 kg. The corresponding limit reference point (LRP) and proposed upper stock reference (USR) are 1,140,000 kg and 1,690,000 kg, respectively. If the 13,783 acres of nursery area upstream of anthropogenic barriers were accessible, the total nursery area would be 72,459 acres. For this amount of nursery area, the SSB0 is 14,100,000 kg. The corresponding LRP and proposed USR are 1,410,000 kg and 2,090,000 kg, respectively. Biomass reference point recalculation may be considered following new information on habitat accessibility and/or changes to the amount of available habitat resulting from modifications to passage efficiency or barrier removal.

Description

1 online resource (12 pages) : maps, charts, photographs

Subject

  • Terms of reference,
  • Habitats,
  • Fisheries management,
  • Dams

Pagination

12 pages

Identifiers

Government document number
Fs70-6/2024-051E-PDF
ISBN
9780660735306
ISSN
1919-5087

Report

Report no.
2024/051
Series title
Science Advisory Report (Canadian Science Advisory Secretariat)

Citation(s)

DFO. 2024. Habitat-Based Reference Points for Saint John River Alewife, Upstream of the Mactaquac Dam. DFO Can. Sci. Advis. Sec. Sci. Advis. Rep. 2024/051.

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Fisheries

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