Which species of trout is considered native to Maine?

Brook trout is recognized as a native species to Maine, making it the correct answer. This species, scientifically known as Salvelinus fontinalis, is well adapted to the state's cold, clean water habitats, and it has a long-standing historical presence in the region.

Brook trout thrive in various water bodies, including streams, rivers, and lakes, and they play a vital role in Maine’s aquatic ecosystems. Their native status is significant because it underscores the importance of conservation efforts aimed at preserving natural habitats for native species, especially in the face of non-native fish species introduction that can compete for resources, alter habitats, or disrupt the ecological balance.

In contrast, while rainbow trout and brown trout are popular in Maine's waters, they were introduced from other regions and are not indigenous to the state. Lake trout is a native species in certain parts of the state but does not have the same widespread historical presence as brook trout across all of Maine's waters. Thus, brook trout is uniquely recognized as the true native trout species in the state.