Bacterial film on a pond surface

Bacterial film on a pond surface

Observation - Bacterial film on a pond surface - UK and Ireland. Description: I think this oily-looking film is caused by bacteria. I dipped a white envelope into the pond and slowly drew it out to sample the film, as you can see in the second picture

I think this oily-looking film is caused by bacteria. I dipped a white envelope into the pond and slowly drew it out to sample the film, as you can see in the second picture