Related Clues:

• Be overly picky
• Ornamental pond fish
• Koi, for one
• Ontario lake
• Goldfish relative
• Have lots of beefs
• Be nitpicky
• Izaak Walton's ''very subtil fish''
• Minnow relative
• Gripe, gripe, gripe
• Bottom-feeding fish
• Bottom feeder
• 21-Across. e.g.
• Fault-find
• Koi