Into the blue: inferring marine distribution of Canadian and Irish Atlantic salmon, Salmo salar (L.) in the North Atlantic Ocean from tissue concentrations of bioaccumulated cesium-137

Spares, A. D. (2006). Into the blue: inferring marine distribution of Canadian and Irish Atlantic salmon, Salmo salar (L.) in the North Atlantic Ocean from tissue concentrations of bioaccumulated cesium-137. https://scholar.acadiau.ca/islandora/object/theses:2993

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Title

Into the blue: inferring marine distribution of Canadian and Irish Atlantic salmon, Salmo salar (L.) in the North Atlantic Ocean from tissue concentrations of bioaccumulated cesium-137

Author
Spares, Aaron Drew
Call Number

LE3 .A278 2006

Date

2006

Supervisor

Dadswell, Michael

Degree Grantor

Acadia University

Degree Name

Master of Science

Degree Level

Masters

Discipline

Biology

Affiliation

Biology

Abstract

Atlantic salmon returning from marine migrations to eastern Canada and western Ireland during 2002/2003 were analyzed for tissue concentrations of bioaccumulated cesium-137 (137Cs). Canadian and Irish salmon demonstrated concentrations (0.20 0.14 Bq kg-1 and 0.19 0.09 Bq kg-1, respectively) suggesting similar oceanic feeding distributions. Canadian aquaculture escapees had similar mean tissue concentrations (0.28 0.22 Bq kg-1 wet wt) suggesting migration with wild salmon, however significantly higher concentrations in 1SW escapees (0.43 0.25 Bq kg-1 wet wt) may alternatively suggest feeding on freshwater prey within original estuaries. High concentrations of wild Canadian 1SW salmon indicated trans-Atlantic migration. Estimates of Canadian and Irish salmon feeding east of the Faroes (~8W) were 15.6% and 10.0%, respectively. I propose most anadromous North Atlantic salmon utilize the North Atlantic Gyre for marine migration and should be classified as one trans-Atlantic straddling stock.

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Permanent Link

https://scholar.acadiau.ca/islandora/object/theses:2993

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