• Great imitation for annelids, earthworms, aquatic worms.
  
• Plus a great attractor in murky waters.  Fish like worms!
  
• If you have never seen an aquatic worm, trying taking a small net into a muddy/sandy portion of a river bed, and you will probably find many!
• Fishermen often over look worms, at least fly fishermen do.  Don't make that mistake.