To je ustvari alga
Lake balls. These green algae grow on the lake bottom
and form a carpet which is very useful for small
bottom-living animals. Some of the algae grow into fist-size
balls. A large part of the lake bottom is covered by the algae.
Vjerovatno je zabranjena za prodaju jer se boje da je neko ne baci u prirodu pa da se ne dogodi s...e.