Abstract
The malacosporean Tetracapsuloides bryosalmonae was detected in kidneys from Atlantic salmon parr in 64 of 91 sampled Norwegian rivers. Using real-time PCR, this parasite was found to be present in Atlantic salmon parr in rivers along the whole coast, from the northernmost and southernmost areas of the country. In addition, T.bryosalmonae was found in kidneys from brown trout parr in 17 of 19 sampled rivers in south-east Norway, and in Arctic charr sampled in the River Risfjordelva, located at the northernmost edge ofthe European mainland. In conclusion, T.bryosalmonae has a widespread distribution in salmonids in Norwegian watercourses. Proliferative kidney disease (PKD) caused by T.bryosalmonae and PKD-induced mortality has been observed in salmonids in several Norwegian rivers and it can be speculated that more PKD outbreaks will occur as a result of climate change.
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