Tonj South Wildlife Officer in Warrap State on Tuesday urged all fishermen to have licenses.
Deng Chol threatened that Wildlife officers would walk around and arrest unlicensed fishermen, Don Bosco reported.
Mr Chol directed all fishermen not to kill crocodiles and other animals living in water because wild animals and water animals were sources of development.
He advised pastoralists not burn bushes and keep their tame animals far from wild animals.