"stella @ stejonda" wrote in
message ...
Hi

For the second year running the many tadpoles in my pond are failing to
grow legs and complete their transformation into frogs. Has anybody any
idea why this might be? Last year they just all died after lasting as
tadpoles well into the summer.

Stella
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stella @ stejonda
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This can be due to a deficiency of thyroxin[growth hormone]~~ caused
by a lack of Iodine [a basic ingredient of thyroxin]. The condition is
known as 'neotany' and in some exotic amphibians never lets them
metamorphose to reach their final stage.
A single drop of iodine in the pond should/could make a difference.
Best Wishes Brian.