From the photo, one does not have a good view of the tail.
Taxonomic key for Fishes of Canada says pattern on pike is dark gound color with white to yellow wavy, vertical stripes in young, or horizontal rows of yellow bean shaped spots in adults, cheeks fully scaled.
The key says Muskellunge pattern is silvery or light ground color with dark spots, blotches or vertical stripes; neither cheeks or opercula completely scaled.
The fish looks to have creamish to yellow spots on ground color body to me. The spots merge into or become wavy lines on the caudal peduncle. Note the small cream spots all over the dark colored opercule cover.
