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The strontium content of roe collected from spawning brown trout Salmo trutta L. reflects recent otolith microchemistry

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The relationship between the strontium content of the outer layers of otoliths (an indication of recent marine, estuarine or riverine habitat use) and the strontium content of roe in ripe female brown trout Salmo trutta was examined in fish collected from the Pomahaka River and the lower reaches of the Clutha River, South Island, New Zealand. A close relationship was found between the strontium content of roe and the outer layers of otoliths. This finding suggests that spawned eggs collected from redds could potentially be used to track the extent of upstream spawning migrations by anadromous brown trout.

Keywords: eggs; migration; otolith microchemistry; salmonid

Document Type: Research Article


Affiliations: 1: Department of Zoology, University of Otago, P. O. Box 56, Dunedin, New Zealand 2: Department of Chemistry, University of Otago, P. O. Box 56, Dunedin, New Zealand 3: GNS Science, Rafter Laboratory, P. O. Box 31-312, Lower Hutt, New Zealand 4: Fish and Game New Zealand, P. O. Box 76, Dunedin, New Zealand

Publication date: 2008-05-01

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