Keanekaragaman dan Distribusi Ikan di Hulu Sungai Asahan Porsea

Abstract

Research about “The Diversity And Distribution Of Fish In Upper Course Of Asahan River Porsea” was investigated in January 2009. Purposive Random Sampling Method was applied in choosing place sampling station. Samples were taken from 5 stations and in each station was done 30 times restarting. Samples were taken by using netss. Identifiying was done in Natural Resources Management and Environment Laboratory, Biology Department, Mathematics and Natural Sciences Faculty of North Sumatera University. The results of research was found fish belong to Osteicthyes class, consist of 4 order, 8 family, 12 genera and 12 spesies. The highest population density, relative density and relative frequency was presented by Gambusia sp. for each value 9,505 ind/m2 , 57,891% and 40%. The lowest population density and relative density was presented by Osteochilus sp. namely 0,014 ind/m2 and 0,086% and the lowest relative frequency was presented by Clarias batrachus, Cyprinus carpio, Osteochilus sp. and Oxyeleotris marmorata with value 10%. The highest index of diversity was found 2nd station namely 2,109 and the lowest index of diversity was found 4th station namely 1,929. The highest index of equitability was found 5th namely 0,941 and the lowest index of equitability was found 2nd station namely 0,849. The pattern of distribution from each spesies of fish was categorized as clumped and reguler. From the correlation analisys showed that light penetration gave positif correlation (same direction) with index of fish diversity and COD