Radioactive strontium (85Sr) in marking newly hatched pike and success of stocking |
| |
| Authors: | P J Vuorinen ‡ K Nyberg ‡ H Lehtonen ‡ |
| |
| Institution: | Finnish Game and Fisheries Research Institute, P.O. Box 6, FIN-00721 Helsinki, Finland;Department of Limnology and Environmental Protection, Box 27, Viikki, E-Building, FIN -00014, University of Helsinki, Finland |
| |
| Abstract: | Immersion of newly hatched pike fry in an aqueous solution of 1·85 MBq ml?185Sr did not affect their growth or survival over 3 weeks. Cannibal pike fry retained only l.2–3·3% of the 85Sr from their labelled prey. Newly hatched 85Sr-marked fry stocked into two lakes in 3 years were distinguishable from wild fish 4–6 weeks later. Stocked and wild fry grew equally well, and stocked pike survived best where density of wild pike was highest. There was no evidence of increase in density as a result of Stocking. |
| |
| Keywords: | strontium-85 pike Esox lucius radioactive labelling stocking |
|
|
