Sebaran Spasial Nekton di Sungai Deli, Provinsi Sumatera Utara

Abstract

The Deli River Basin is an area that covers parts of the area located in Karo Regency, Deli Serdang and Medan City. There are many community activities along the Deli River, such as bathing, sand dredging, agriculture and it is not uncommon for local communities to use the Deli River as a place to collect rubbish. This affects the quality of the Deli River and can influence the life of organisms in it. Nekton is biota that can live freely and actively swim without being affected by water currents. In an effort to determine the spatial distribution of nekton, it can be assessed using population density, relative density, frequency of presence, Shannon Weinner diversity index, and equitability index. The aim of this research is to determine the structure of the nekton community and the spatial distribution of nekton in the Deli River. This research uses quantitative descriptive where the author will explain or conclude the data in the form of numbers. The method used to determine stations is purposive sampling, namely by selecting 18 points along the Deli River. Physical and chemical water parameters were also measured in the form of temperature, Ph, DO, river body width, depth, brightness, current speed and turbidity. The results of the research show that the nekton community structure in the Deli River is 12 species and 9 families, and the spatial distribution of nekton in the downstream area is dominated by the clarias batrachus species, while in the middle and upstream parts it is dominated by the caridina gracillirostris species.