Historical clue formulations

• Fast-sounding freshwater fish — 2022-11-13
• Sand ___ (perchlike fish) — 2013-09-29
• Freshwater fish of the perch family — 2006-12-09
• Fast freshwater fish — 2000-11-25
• Snail ___ (endangered fish) — 1997-04-15
• Furtive one — 1996-03-28