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Stocking success of newly hatched pike evaluated by radioactive strontium (85Sr) marking

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The stocking of newly hatched pike Esox lucius labelled with radioactive strontium (85Sr) and later electrofishing of the same area was found to be a workable tool in assessing the success of pike stockings. 85Sr‐labelled individuals constituted 96% of the 0+year pike catch from late summer electrofishing in the stocked littoral areas of the heavily regulated Lokka Reservoir. The density of 0+year pike reached 2·1 individuals 100 m−2 in the stocked areas in comparison to 0·3 individuals 100 m−2 in the reference areas. In the three other stocked lakes the proportion of labelled pike in the catch ranged from 0 to 42% in late summer. The results suggest that pike stockings are profitable in filling empty or nearly empty 0+year pike habitats of regulated lakes or other waterbodies, where the natural reproduction of pike has declined due to human activities.
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Keywords: Esox lucius; electrofishing; labelling; pike; stocking; strontium

Document Type: Regular Paper

Affiliations: Finnish Environment Institute, PL 140, FIN-00 251 Helsinki, Finland and

Publication date: 2004-03-01

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