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Quick answer
White spawn may have died or could grow into albino tadpoles.
Further
information
If you have noticed that the normally black centre of the spawn
is white then it could be because it has not been fertilised.
This spawn will naturally break down in the water.
However, if
the white dots start to become 'comma' shapes, like ordinary
spawn, then this will hatch into white or 'transparent'
tadpoles. These tadpoles are either albino (missing all skin
colour pigments and will have pink eyes) or are just missing
certain skin pigments.
White tadpoles do not always survive well in the wild as they
are so conspicuous to predators. Those that do survive don't
necessarily turn into white frogs, often they become darker in
colour as they grow.
It may not be an albino frog that has laid these eggs, it could
just be that there is a high proportion of the local frog
population that carries the gene for albinism. If this is the
case then you may see this occurring in future years.
Native amphibians.
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