Related Clues:

• Mud, sand and cusk
• Sushi candidates
• Serpentine fish
• Anguine fish
• Electrolocation users
• They're slippery when wet
• Shockers in the deep
• Otters' prey
• Electric swimmers
• Conger line?
• "Electro-Shock Blues" band
• Wiggly swimmers
• Wet wigglers
• Fish with slimy layers
• Sniggler's reward