Historical clue formulations

• Reef predator — 2025-06-14
• Cooperative hunter with the coral grouper — 2023-10-27
• Menacing eel — 2022-09-27
• Reef denizen — 2015-12-12
• Encounter for a reef diver, maybe — 2015-04-15
• Kind of eel — 2012-08-27
• Conger cousin — 2010-11-07
• Reef predator — 2008-12-20
• Feared eel — 2002-03-25
• Ichthyologist's specimen — 1995-11-10
• Conger's cousin — 1994-07-17