Fish killer cause identified
Natural Resources Wales (NRW) said more than 500 dead fish were found in the River Afon, a tributary of the Vyrnwy near Llansantffraid-ym-Mechain.
And now, the BBC is reporting that NRW officers said the likely source was drainage of a wildlife pond and wetland by a landowner.
It is thought nutrients in this water reduced oxygen levels in the river.
Rob Ireson, senior environment officer at NRW, told the BBC: "Draining water from a pond to a stream may seem quite harmless - but it is what probably wiped out most of the fish on this stretch of the Cain.
"The water may look and smell normal - but it can be lethal for fish."
NRW said it was likely the fish suffocated when the drained water - which they believe contained low levels of dissolved oxygen and carried nutrients that could reduce oxygen levels even more when they break down - mixed with the river water.
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