Belarusian lobsters!

River people live in peace,
Life is measured here,
Won fish swim frivolously,
Won cancer under the stone in the afternoon lies.
He is one of the most important,
He loves to walk at night,
On the bottom of the river is always brave
He walks the river to check.
In the water, he only wanders clean
And in the dirty he will not live
Everyone knows if the cancer goes away -
Became means dirty water.