What key external marking differentiates a pure Paiute Cutthroat Trout?

Answer

A distinct, dark spot at the base of the tail fin (caudal spot).

The critical identifier used by biologists to verify unhybridized Paiute Cutthroat Trout stock, distinguishing them from closely related cousins, is a specific marking located at the caudal fin base. This marking is described as a distinct, dark, often black spot, officially referred to as a caudal spot. This feature is essential during restoration efforts to confirm that the fish being propagated have not interbred with introduced rainbow or brook trout, which might lack this consistent and specific spotting pattern. This granular visual detail, while subtle to a non-specialist, serves as the primary visual marker confirming the fish's pure lineage.

What key external marking differentiates a pure Paiute Cutthroat Trout?

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