Virtually every inch of the Miramichi and its tributaries holds brook trout – actually a char. During the warm parts of the summer these fish move out of the main stem of the Miramichi and into cooler tributaries or locate spring holes. The average riverine trout are relatively small with very few larger than 12 inches in size. Some of these fish become sea-run brook trout, and these can attain sizes as large as 7 pounds. Generally speaking, the sea-run trout migrate down to the estuary, and enter tidewater after spawning in October. After feeding in the estuary for the winter they return to the Miramichi and its tributaries in May. They spend the summer in fresh water in anticipation of fall spawning.
Many large sea run trout are caught during the April and early May kelt fishery. Some are also caught during the summer in cool areas of the headwaters. During the fall many are caught on flies fished for salmon.
The Miramichi River system has a native spawning population of striped bass. Striped bass spawn in late May in the lower reaches of the Northwest and Southwest Miramichi. These fish grow to be large with some individuals reaching up to four feet in length and over 30 pounds in weight. Most striped bass go out into the ocean from June through September. Several of the Atlantic salmon outfitters offer guided striped bass fishing during May and very early June before the salmon runs get busy.