Due to illegal fishing by the non-local fishermen, who belong to nomad community, the Netravati river water is getting contaminated and it has been alleged that organisms living in water are being destroyed.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/illegal-fishing-poses-threat-netravati-water
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/deccan-herald-bangalore
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fisheries
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/karnataka
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/netravati
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/kannur-d