Never seen this before


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Not sure if I’m in the right place but hopefully the water experts can help.

I need to find out what this is but I’m struggling. It’s in an whopping great estate pond, concrete built and has aeration and a fairly decent fish stock. This has been building up on the cables and Pipework for at least a year but is a lot worse this year. Strange stuff, hopefully someone can help. I should probably mention this is UK.

83987411-50B9-4544-B2BC-3E3EC0BB00B0.jpeg
 
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JRS

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Nothing I've seen before. Is that a power cord around it? Consistency? Some type of black algae perhaps but looks almost foamy?

I heard you also have those fatbergs over there...;)
 
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That’s the power cable yeah. I haven’t been up there for a while and I didn’t take the pic but I remember it being pretty tough and not foamy. Pretty odd stuff, looks like something you’d find in the sea not a pond.

And haha no, I seriously hope it’s not a fatberg.
 

Mmathis

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Well, my first thought was a contorted water Lily tuber, but IDK…. Have you tried to cut into it, or scrape it?
 
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Well, my first thought was a contorted water Lily tuber, but IDK…. Have you tried to cut into it, or scrape it?
There’s no lilies at all so I wouldn’t have thought so. I need to get up there and take a look I guess. I’ll get some better pictures and hopefully all will become clear.
 

addy1

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If we leave our ropes, hoses in the water at our boat stuff builds up fast on the items. It is possible just some dense algae that has decided to grow there.
 
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If we leave our ropes, hoses in the water at our boat stuff builds up fast on the items. It is possible just some dense algae that has decided to grow there.
I think you must be right, I’ve been working on ponds for nearly a decade and I’ve just never seen anything like it. I’ll grab a sample when I’m back there and maybe get it under a microscope or something to try and confirm.
 
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IT's black foam that was not pressed into a square. like waterfall foam i guarantee it. if your on the ocean then it may have had a form prior but the surf beat it up to its now shape
 
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IT's black foam that was not pressed into a square. like waterfall foam i guarantee it. if your on the ocean then it may have had a form prior but the surf beat it up to its now shape
Whatever it is, it’s growing so I can’t see how it can be foam but I’ll cut into the stuff and see when I’m up there next. Won’t be for a week or so but I will update as I’m sure you’re all dying to know
 
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Does anyone know anything about pectinatella? A slimy mass of organisms that form apparently.

I think there’s different types of pectinatella but here’s a picture for reference.
 

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Interesting, never heard of that. Very similar to your stuff.

It’s pretty similar but not an exact match to any pictures I can find. It’s got to be living though if it’s growing right?
 
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Not sure if I’m in the right place but hopefully the water experts can help.

I need to find out what this is but I’m struggling. It’s in an whopping great estate pond, concrete built and has aeration and a fairly decent fish stock. This has been building up on the cables and Pipework for at least a year but is a lot worse this year. Strange stuff, hopefully someone can help. I should probably mention this is UK.

View attachment 152818
Any kind of freshwater sponge?
 
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