• no adipose fin is present
• ventral protrusible mouth, opening downwards
• snout rounded almost square when viewed from the side
  king when viewed downwards from above
  

Known distribution: Southeast Yukon and Mackenzie River systems (less common in the Yukon).

Other notable comments and clues:

• Sometimes referred to as the common sucker.
• The most distinguishing feature of the juvenile white sucker, like the longnose sucker, is its ventral protrusible mouth that opens downwards.
• The head is almost square shaped, unlike the longnose sucker, which is more pointed.
• Take note of the distribution as the white sucker is less commonly found.