Summer survival and activity patterns of estuary feeding anadromous Salmo trutta

Honkanen, H. M., Rodger, J., Stephen, A., Adams, K., Freeman, J. and Adams, C. E. (2020) Summer survival and activity patterns of estuary feeding anadromous Salmo trutta. Ecology of Freshwater Fish, 29(1), pp. 31-39. (doi: 10.1111/eff.12485)

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Abstract

There is generally a very poor understanding of how anadromous brown trout, Salmo trutta, use marine ecosystems. In this study, we use acoustic telemetry techniques to test four alternative hypotheses for estuarine coastal habitat use by this species on a population in the Clyde, west‐central Scotland. Anadromous brown trout in their second (or more) summer feeding in the marine environment did not show patterns of estuarine use predicted from studies on other populations of this species. They did not (a) use the inner Clyde Estuary as a staging post for onward migration to open coastal waters, nor did they (b) pass through the estuary rapidly nor did they (c) make multiple incursions into freshwater. In contrast, fish utilised a very geographically constrained area of the inner estuary (<8 km in length), within which fish were highly mobile, exhibiting more activity during a flooding tide and exhibited high survivorship compared with reports from other studies. The reasons why estuarine use by anadromous brown trout in the Clyde may differ from that reported elsewhere is discussed.

Item Type:Articles
Additional Information:Funding information: EU Interreg IVA, Grant/Award Number: 2859.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Rodger, Miss Jessica and Adams, Professor Colin and Honkanen, Ms Hannele
Authors: Honkanen, H. M., Rodger, J., Stephen, A., Adams, K., Freeman, J., and Adams, C. E.
College/School:College of Medical Veterinary and Life Sciences > Institute of Biodiversity Animal Health and Comparative Medicine
Journal Name:Ecology of Freshwater Fish
Publisher:Wiley
ISSN:0906-6691
ISSN (Online):1600-0633
Published Online:10 May 2019

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