What was this weird mucus in my pond?

So I have 10 koi in my pond, 1 sterlet and recently a frog decided it was his home. Today, my family was cleaning it and we found a really long string of mucus in it. I dont think its algae, as its not green at all and looks VERY similar to what human snot looks like if it had been stretched out super far. Could... show more So I have 10 koi in my pond, 1 sterlet and recently a frog decided it was his home.
Today, my family was cleaning it and we found a really long string of mucus in it. I dont think its algae, as its not green at all and looks VERY similar to what human snot looks like if it had been stretched out super far.

Could it be something like frogspawn or koi eggs? I have no pictures, but just imagine what I said (super long snot lmao)
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