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Radioactive strontium ( 85 Sr) in marking whitefish [ Coregonus lavaretus (L.)] larvae and the dispersal of larvae from river to sea
Author(s) -
Lehtonen H.,
Nyberg K.,
Vuoronen P. J.,
Leskelä A.
Publication year - 1992
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1992.tb02670.x
Subject(s) - coregonus lavaretus , biology , strontium , larva , isotopes of strontium , hatching , fish migration , yolk sac , coregonus , radionuclide , strontium 90 , river mouth , zoology , serranidae , yolk , biological dispersal , fishery , ecology , fish <actinopterygii> , population , sediment , embryo , paleontology , physics , demography , sociology , nuclear physics , quantum mechanics
Anadromous whitefish [ Coregonus lavaretus (L.)] yolk‐sac larvae were marked with a radioactive strontium isotope, 85 Sr. Before marking the method was tested in accumulation‐elimination tests using various strontium concentrations. The first‐phase effective half‐life of 85 Sr in yolk‐sac larvae was 4 days. The mean 85 Sr radioactivity was 81 Bq per larva at the day of release and the half‐life of the slow component was 51 days, so the strontium label was easily detected up to 60 days after marking. The larvae were released into the River Simojoki about 12 km upstream from the river mouth and recaptured from early May to the end of July. Marked larvae were found at the river mouth 12–13 days after release, while the last marked fish in the river were found at 16 days. It is likely that all leave the river within 2 to 3 weeks post‐hatching. Two months after marking some larvae had attained a distance of 10 km from the river mouth.