Robin Biznis
When I was back, I noticed a fisherman holding a fish in his hand.
I came closer to see what he caught.
Then they explained to me that they were fishing there for a fish called a tostolbik.
They have a special system for fishing.
Lat.Hypophthalmichthys nobilis-Tostolobik on Serbian
The bighead carp is a species of freshwater fish, one of several Asian carps. It is one of the most intensively exploited fishes in aquaculture, with an annual worldwide production of over three million tonnes in 2013, principally from China. source: Wikipedia
I learned something. I have heard of carps.