The occurrence of Myxobolus neurobius (Myxosporea) in wild young Atlantic salmon and Arctic char in Newfoundland

Spores identified as Myxobolus neurobius were found in head homogenates of both wild young Atlantic salmon Salmo salar and Arctic char Salvelinus alpinus . Formalin-preserved spores from Atlantic salmon measured an average of 12.9 x 9.4 mu m and contained two polar capsules that measured 6.4 x 2.9 mu m. The spores from the Arctic char appeared morphologically identical by bright-field microscopy to those from the Atlantic salmon except they measured 13.7 x 9.6 mu m and had polar capsules that measured 6.9 x 3.4 mu m. Myxobolus neurobius has not previously been reported from Atlantic salmon or Arctic char.