What is this

[Paddlehands]

Ok so cleaned out my pond filters and saw these...
What are they...
Of course tge ducks ate them... but is this a larvae or

a parasite (they excrete and reingest)

 

[azygous]

That's certainly a revolting mess in that puddle. Given that the microscopic fauna and flora can number in the thousands when it comes to the numerous species it could be, we can't tell from a video. But, the safe thing to do would be to clean up all such puddles to deprive the ducks of whatever mystery villains might be waiting in there to make them sick. Then you'd be trying to scramble to figure out what to treat and how to treat which can be a nightmare challenge.

 

[Paddlehands]

This puddle is the remnant of my pond filter system... so there is no where near this quantity in their pond..
I have a diy filtration system, to remove muck and grit and these come out at the current last stage; washing machine bag step.

 

[D Uccle Uncle]

Difficult to see in the videos, but given the environment and red color I'm thinking bloodworms.