Carcass analog addition enhances juvenile Atlantic salmon (Salmo salar) growth and condition

Canadian Journal of Fisheries and Aquatic Sciences
By: , and 

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Abstract

Our study used historic marine-derived nutrient (MDN) delivery timing to simulate potential effects of restored connectivity on juvenile Atlantic salmon (ATS; Salmo salar) growth and condition. Four headwater streams were stocked with ATS young of the year (YOY) and received carcass analog additions (0.10 kg·m–2 wetted area) in treatment reaches to match the timing of sea lamprey (Petromyzon marinus) spawning. Individual ATS mass was 33%–48% greater and standard length was 9%–15% greater in treatment reaches relative to control reaches for 4 months following nutrient additions. Percent total lipids in YOY ATS were twice as great in treatment reaches 1 month following carcass analog additions and remained elevated in treatment fish for 2 more months. Absolute growth rates, based on otolith microstructure analysis, correlated with water temperature fluctuations in all reaches and were elevated by an average of 0.07 mm·day–1 in treatment reaches for 1 month following carcass analog additions. Simulated sea lamprey MDNs increased juvenile ATS growth, which, via potential increases in overwinter survival and decreases in smolt age, may contribute to population persistence and ecosystem productivity.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Carcass analog addition enhances juvenile Atlantic salmon (Salmo salar) growth and condition
Series title Canadian Journal of Fisheries and Aquatic Sciences
DOI 10.1139/cjfas-2012-0496
Volume 70
Issue 6
Year Published 2013
Language English
Publisher Canadian Science Publishing
Contributing office(s) Coop Res Unit Leetown
Description 11 p.
First page 860
Last page 870
Online Only (Y/N) N
Additional Online Files (Y/N) N