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Quick answer
The death of tadpoles is often related to a lack of oxygen in
the water, usually caused by a sudden algal bloom.
Further
information
If there has been some warm weather and the water has turned
green, this indicates that there is a lot of algae growing in
the water. Algae removes oxygen, leaving the water 'anoxic', and
the tadpoles suffocate. To avoid this happening again, make sure
the pond is not completely in sunlight and that there are plenty
of aquatic plants present, which use up excess nutrients (stopping
too much algae growing) and produce more oxygen.
If the water is not green then it could be that some sort of
chemical/product has been washed off surrounding land by rain
and run into the pond, or even the bark or leaves of a toxic
plant have landed in the water. If you suspect this to be the
case contact the
Environment Agency or
Pond Conservation for
further information.
Just Add Water
- your guide to creating and maintaining the perfect pond
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