Tadpole story

Tadpole story

Observation - Tadpole story - UK and Ireland. Description: I monitor my frogs and poles very closely. I have two ponds, one open, the other, far more natural,

I monitor my frogs and poles very closely. I have two ponds, one open, the other, far more natural, hidden and vegetated.
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This year in the open one, something drastic happened. Much of it failed, sinking within 10 days to become cloudy and later, about three weeks or so, to become a rotting and rancid mess in the pool. Between times, in that period, something, like an otter perhaps, came and drastically disturbed the mass, taking much of it away (which is why I doubted ducks or herons)
But the frogs come in two phases, so new clean spawn arrived. In all years, I interchange spawn between the two ponds.
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The first pictures 1, 2, 3, 4 and 5 are all taken on the same day with the same batch, not long hatched from their jelly food. One can see their external (salamandan) gills which disappear in less than a week. And we can see the colour variation - discussed here https://www.ispotnature.org/communities/uk-and-ireland/view/observation/800659/
Lighting is obviously different and Pictures 6 & 7 are taken in a glass dish 2 days later (from the same batch). We may infer that lighting is the key to colour rendering. But, although I knew there were colour differences, it did not grab me firmly enough, so I (we!) will have to wait until next year when I can study it closer.
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I have added more pictures than are needed for this record, so that they are together.
The pond is still somewhat rancid but the water is clear enough to see very healthy poles going about their business, at both sites. Neither are overcrowded.