• adipose fin is present
• parr marks absent (NOT present)
• lower jaw obviously extends way beyond upper jaw, like an “under-bite”
• large head that looks quite pointed from the side
• caudal (tail) fin distinctly forked
• body not compressed, or seems elongated
• dorsal fin fairly far back towards tail of fish
  
  

Known distribution in Yukon: throughout the Yukon River system to its headwater and Mackenzie River system.

Other notable comments and clues:

• The most distinguishing feature of the juvenile inconnu is the lower jaw obviously extends beyond the upper jaw.
• Can be easily mistaken or confused with juvenile least cisco.