Sadiq Ali, Tehmina, and Sundas Ejaz
Trout is the general name for many species of fish belonging salmon family. Out of 39,900 species of vertebrates, about 21,723 living species of fish have been reported. In 1930, in Gilgit, a British officer introduced the species. It has large scales, dark and red spots on the sides that are thickly spotted. The purpose of the study was to investigate the presence and absence of heavy metals, Lead, Chromium VI, Arsenic and Cadmium in rainbow trout (Oncorhynchus mykiss) in the Gilgit river environment. Descriptive statistics of concentrated heavy metals in different organs of trout fish revealed that only chromium VI was found in range of (p<0.35) to (p>0.97) ppm was recorded. The maximum concentration of chromium was detected from gills (p>0.97) whereas minimum concentrations were observed from skin (p<0.35). The average concentration of chromium was noticed from muscles (p>0.53) of trout fish. The directional flow of municipal liquid effluents and solid waste in the river Gilgit at various points is the main precursor behind the situation. Before joining the river, there should be a proper drainage system to remove hazardous metals and chemicals.