The population of Palla fish in Sindh has declined to a significant extent. This phenomenon is attributed to the reduced flow of Indus River, resulting in the restricted upstream migration of Palla fish for breeding.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/palla-population-declining-fast
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/nation-pakistan
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fish
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sindh