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Quick answer
Common causes of disappearing spawn/ tadpoles are predators and
cold weather.
Further
information
Spawn and tadpoles require warmth and light to develop properly.
If they have disappeared it may be because they've died. Late
frosts or a shady pond could be responsible for this. Sometimes
spawn sinks out of sight but still develops normally.
The most common cause of disappearing spawn/tadpoles in the
numerous predators in and out of the pond. These include fish,
newts, water boatmen, dragonfly larvae, birds, rats, foxes and
hedgehogs.
A disappearance could also just mean they have just moved on to the
next stage - if there is no spawn, it may have hatched, if there
are no tadpoles, they may have metamorphosed into froglets.
Spawn/tadpoles are being preyed on.
Protecting spawn from frost.
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