Stocking success of newly hatched pike evaluated by radioactive strontium ( 85 Sr) marking
The stocking of newly hatched pike Esox lucius labelled with radioactive strontium ( 85 Sr) and later electrofishing of the same area was found to be a workable tool in assessing the success of pike stockings. 85 Sr‐labelled individuals constituted 96% of the 0+year pike catch from late summer elect...
| Published in: | Journal of Fish Biology |
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| Main Authors: | , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Wiley
2004
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1111/j.1095-8649.2004.00329.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.2004.00329.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.2004.00329.x |
| Summary: | The stocking of newly hatched pike Esox lucius labelled with radioactive strontium ( 85 Sr) and later electrofishing of the same area was found to be a workable tool in assessing the success of pike stockings. 85 Sr‐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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