Sebaran Spasial dan Temporal Nekton di Perairan Danau Toba Provinsi Sumatera Utara

Abstract

Lake Toba has a variety of potential uses, ranging from floating net cages (KJA), sources of clean water raw materials, transportation routes, to the tourism sector. The increasing high human activity in Lake Toba has resulted in the potential for a decline in water quality, which will have an impact on the survival and diversity of nekton. This study aims to determine the spatial and temporal distribution of nekton in Lake Toba using the purposive sampling method at twenty-one observation stations during the rainy season and dry season in August-December 2024. The analysis calculations using the Shannon-Wiener diversity index (H '), uniformity index (E) and dominance index (D). The results of the analysis showed that there were 11 families and 20 species of nekton, with Amphilophus labiatus being the highest catch with a value of 14015 ind/m2 (dry season) and 15668 ind/m2 (rain), and the lowest was in the species Hemibagrus nemurus (1 ind/m2).