Wangboje , O.M. 2018. “Heavy Metals in Heterobranchus Longifilis (Cuvier And Valenciennes, 1840) Cultured in Earthen Ponds in Selected Communities in Warri Metropolis, Nigeria”. Uganda Journal of Agricultural Sciences 18 (2):67-82. http://journal.naro.go.ug/index.php/ujas/article/view/153.