Related Clues:

• Despite its weight, the timber will be floating in the water
• The weight of timber that's been in the water (8)
• Primitive life perhaps makes 5 down not up at last
• Sea food
• Microscopic organisms that float on the surface of water
• Stuff drifting in the ocean
• Whale's diet
• Support heavyweight sea creatures
• Exercises to keep thin and on seafood diet
• Tiny floating organisms
• Drifting marine organisms
• Microscopic sea food
• Drifting aquatic organisms
• Drifting ocean organisms
• Food source for aquatic creatures