Historical clue formulations

• Venomous reef dweller — 2024-07-26
• Source of a venomous underwater bite — 2018-11-21
• Coral reef inhabitant — 2017-10-21
• Venomous swimmer — 2017-01-06
• Dangerous swimmer with an oarlike tail — 2008-03-08
• Pacific wriggler — 2006-08-31
• Japanese delicacy — 2005-04-29
• Reef wriggler — 2001-07-20