Hubungan Struktur Komunitas Ikan dengan Kualitas Air di Perairan Sungai Asahan Kabupaten Toba Samosir Provinsi Sumatera Utara

Abstract

Corelation of structure of fish community to the water quality in Asahan river regency of Toba Samosir at North Sumatera has been studied. Three different study site was settle using purposive sampling method based on activities. Ten genera of fishes, classifying into three orders (Cypriniformes, Perciformes, Siluriformes) and five families (Cyprinidae, Balitoridae, Mastacembellidae, Bagridae, Sisoridae) were recorded from research location. The highest diversity is found at first location with the number 0,157 ind/m2 and the lowest one is found at the third location with the number 0,013 ind/m2 . The highest diversity index recorded from second location with the number 1,554; while the lowest is found in the the first location with the number 0,487. Nitrat, phosfat and light intensity are evidently correlated to the diversity of fishes.