Document Type : Research Paper
Department of Geography, University of Karachi
This study was carried out to evaluate natural resources of some Indus creeks using geospatial technologies. The first phase of the study was a detailed monthly water quality and fish stock survey for one year along with associated environmental observations, which was analysed via Landsat 8 imagery for 2014. In the second phase of the study, appropriate indicators were selected in weighted overlay on ArcGIS platform to perform creek productivity analysis. For this purpose, 13 creeks of Indus delta were selected for detailed analysis. These creeks were chosen using GIS techniques based on accessibility, depth and size. Results obtained from a total number of 65,085 fish catch from 252 identified fisheries important species in which 134 species were estuarine, 107 species marine and 11 species belonged to freshwater. Out of these, six species of Penaeus indicus, Pennahia anea, Stolephorus indicus, Escualosa thoracata, Charybdis sp.and Acanthopagrus arabicus were selected for spatial distribution analysis. It is observed that creeks of west of Jhang River known as Issaro, Waddi Khuddi, Patiani, Mal, Dabbo, Chann, Richhal had higher fish abundance and species richness than those of eastern creeks. The important fisheries species showed strong correlation with mangroves, salinity and temperatures. This study indicated that all parameters were strongly dependent on anthropogenic interventions at the study area and these activities seriously affected fish catch and growth of species mainly because of recent environmental changes. It has been revealed from the creek productivity analysis that the study area is still highly productive and intact as an ecological unit.