Pale tadpole - maybe diseased?

Pale tadpole - maybe diseased?

Observation - Pale tadpole - maybe diseased?. Description: Large tadpole, but very pale - rear legs colourless and reddish around where front legs are developing. Is it diseased?

Large tadpole, but very pale - rear legs colourless and reddish around where front legs are developing. Is it diseased?