Related Clues:

• Seaweed
• Kelp, e.g.
• Biology 101 subject
• Robin's quest
• Reef denizen
• Aquarium growth
• Unicellular creature
• Fishhook attachment
• Jellylike blob
• Bird's find
• Sea moss constituent
• Pool life form
• One-celled critter
• Word with inch or tape
• Sea lettuce, e.g.