In my pond, what are long thin white worms?

Answer by  ferfer72 (2623)

They could be flatworms, or Platyhelminthes. They're harmless. They usually mean that you're over-feeding your fish, and there are too many leftovers. You should clean your pond and re-evaluate your feeding amounts. If you see that your fish are suffering in any way, you should get a professional opinion. There are other problems that could be happening.

Answer by  mb (5482)

These are probably just simple earthworms. If they are living in a anerobic (oxygen lacking) enviroment (like the muck of a pond) they will lose their natural pigmentation. Look for the striations, they will still be there, just paler.

Answer by  srainne (2597)

These are probably horsehair worms, as they love wet areas such as pools, ponds or puddles. They grow as parasites in crickets, grasshoppers, beetles, etc. However, they are not parasitic to humans.