Density Population and Growth Pattern Hemibagrus nemurus(Valenciennes 1840) inBilah River

Abstract

The purpose of this study is to find out the bioecological aspects of Asian Redtail Catfish (Hemibagrus nemurus) in Bilah river, Labuhanbatu regency, this study uses purposive sampling method. Correlation of physical and chemical factors of the waters with population density, growth patterns, population density, and genital ratio of H. nemurus. In this study the determination of observation stations as the location of sampling of fish using purposive sampling. The result showed population of H. nemurusfrom station 1 found (6individual/m2), station 2 found (12ind/m2) individual fish, station 3 found (12ind/m2), station 4 found (14ind/m2), at station 5 found (12ind/m2), at station 6 found (6ind/m2), at station 7 found (10ind/m2) individual, at the station 8 found (8ind/m2) and station 9 found (8ind/m2). The density of Asian Redtail Catfish population in the central Bilah river were obtained between 0.03-0.07 individuals/m², and the Growth Pattern of the length and weight of Asian Redtail Catfish Fish result were positive allometrics (b=3,136). Growth can provide information about the relationship of length-weight and chemical physics factors in the water of Bilah river. This is a very important effort in the management of fish growth patterns in Bilah river waters and as an information base for the management of sustainable fishery growth patterns.