Northwest Fisheries Science Center

Monster Seminar JAM

Event Information

Monster Seminar JAM - Production losses in Baltic Atlantic salmon stocks -- causes and potential mitigation measures

Dr. Kjell Leanardsson, Researcher, Dept. of Wildlife, Fish and the Environment, Swedish University of Agricultural Sciences

More Information:
Background of the development of the Baltic salmon stocks. Cleaning of the rivers for timber floating, hydropower regulation of many rivers, and later on sea fishery reduced the stocks to very low levels. Reduction in the sea fishery after critically high prevalence (95 % mortality of alevins) of the disease M74 (unknown cause) has led to the recovery of the wild salmon stocks in the few rivers that so far have been left unregulated. However, during the last 20 years the post-smolt survival has declined by ca. 50-70 % and the causes behind this decline have not been identified. It seems that the decline is more pronounced among the wild post-smolt than among the larger sized hatchery reared post-smolt. I show how models can help us to identify:
  1. when and how re-establishment of salmon into a highly regulated river may be possible, and
  2. potential causes to high mortality in the sea phase of migrating fish populations

2725 Montlake Blvd. E.
Seattle,  WA  98112

Date and Time:
Thursday, May 5, 2011, 11:00 am - 12:00 pm

Contact Person(s):
Diane Tierney
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NWFSC Monster Seminar JAM
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