Disappearing tadpoles

A couple of weeks ago we had dozens of newly hatched tadpoles clinging to the side of the pond in shallow water (I netted the area to protect from birds). They seemed happy in this particular part of the pond for a few days. Suddenly they disappeared & there is now no sign of them anywhere. Has anyone else experienced this? Could they just have dispersed & gone to deeper parts?
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If you live in Derbyshire, as I do.