Wildlife pond

frogspawn4

I have a small pond in my back garden - about 15 years old. I have been taking out some of the weed cos it is taking over the pond and I have come across what look like tiny clam shells. They are pale grey in colour and are about the size of a pea. I have never seen these before in the pond. Should I be worried and how did they get in the pond in the first place?

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