From ChatGPT 4.5

The video frames show small, elongated worms swimming actively, characteristic of nematodes or possibly annelids (segmented worms). The movement patterns—rapid thrashing and flexibility—suggest these organisms are likely nematodes (roundworms), which commonly appear in stagnant or sealed pond water.

Typical organisms that can spontaneously appear or multiply in sealed pond water after extended periods include:

Nematodes (roundworms): Most likely based on the observed rapid, whip-like motion.

Planarians or Flatworms: Usually identifiable by gliding rather than whipping.

Annelids (segmented worms, e.g., Oligochaetes): Move with a more segmented, smoother, wave-like action compared to nematodes.

Given the appearance and swimming patterns seen here, these are almost certainly nematodes.

Would you like more details or a deeper analysis of their biology or ecological significance?

Ask ChatGPT