Struktur Komunitas Nekton di Danau Pondok Lapan Kecamatan Salapian Kabupaten Langkat

Abstract

Nekton is organisms that can swim and move on their own accord with example amphibians and aquatic insect. This study aims to determine the structure of nekton community and relation about physical and chemical conditions in the Lake Pondok Lapan . This study was carried out from January to March 2015. Data collection were nekton species composition and abundance, as well as water quality data as a supporter. Nekton retrieval used fish nett and fishing rod. The results showed there were 5 of the Ordo, of which 4 ordo belongs to fish and 1 ordo of shrimp. Sepat rawa (Trichogaster trichopterus) was found to be caught at most in the amount of 141 and 56% relative abundance. Diversity nekton in Pondok Lapan lake including low at 0,1. General dominance index value approaching 0 is equal to 0.2. It shows that almost no one species dominates. Value uniformity tends to approach the number 0 is equal to 0.07. The figure shows the number of individuals of each type of deployment is not the same. SPSS correlation analysis results showed that temperature, depth, brightness pH ,DO and COD has a positive correlation with the abundance of nekton while turbidity and COD have a negative correlation or do not have the relationship with the abundance of nekton.