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Recruitment sources of brown trout identified by otolith trace element signatures.

Olley, R. and Young, R.G. and Closs, G.P. and Kristensen, E.A. and Bickel, T.O. and Deans, N.A. and Davey, L.N. and Eggins, S.M. (2012) Recruitment sources of brown trout identified by otolith trace element signatures. New Zealand Journal of Marine and Freshwater Research, 45 (3). pp. 395-411.

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Article Link(s): http://dx.doi.org/10.1080/00288330.2011.592196

Publisher URL: http://www.tandf.co.uk

Abstract

This study examined whether element: Ca ratios within the otoliths of juvenile brown trout could provide accurate trace element signatures for specific natal tributaries, and attempted to match these to trace element natal signatures found within the otoliths of adult trout caught in the main stem rivers of the same catchment. The trace element signatures of juvenile trout otoliths were analysed from a sample of eight tributaries representing the main sub-catchments of the Motueka River catchment, New Zealand. Trace element signatures were determined using laser ablation inductively coupled plasma mass spectrometry, and differentiated using linear discriminant function analysis with an overall cross-validated classification success of 96.8%. Temporal stability in element: Ca ratios was investigated by repeat collections of juvenile fish over two years. Natal signatures from 11 of 23 adult trout sampled from the catchment main stems were matched to one of the eight tributary signatures showing recruitment sources to be spread relatively evenly throughout the catchment. This study demonstrates the potential of using otolith trace element analysis to determine the natal origins of freshwater fish within a catchment.

Item Type:Article
Corporate Creators:Department of Employment, Economic Development & Innovations (DEEDI), Biosecurity Queensland
Business groups:Biosecurity Queensland
Additional Information:© The Royal Society of New Zealand.
Keywords:Brown trout; otolith; element analysis; natal signatures; recruitment; raser-ablation-icpms; spatial variability; describe movements; fish populations; American shad; natal origins; marine fish; chemistry; river; juvenile.
Subjects:Aquaculture and Fisheries > Aquaculture > Fish culture
Deposited On:12 Apr 2012 04:56
Last Modified:12 Apr 2012 04:56

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