Hubungan Panjang Berat Ikan Juaro (Pangasius polyuranodon) DI Perairan Sungai Siak, Riau

The water quality of the Siak River is classified as polluted. This is due to the many sources of pollutants that enter river waters. The decrease in water quality will affect the living things in it. Although the Siak River has been polluted, there are still many juaro fish (Pangasius polyuranodon) to be found. This research will look at the long-weight relationship of juaro fish that live in polluted Siak River waters. This research was conducted in December 2016 in the waters of the Siak River with 4 samplings. The method used in this research is a survey method. The results of the analysis showed the similarity of the length-weight relationship for male juaro fish W = 0.013L 2.899 while for female fish W = 0.017L 2.805 . The relationship between length and specific gravity of male and female fish caught showed a growth pattern that was not much different. the coefficient of determination (R 2 ) is 0.9793 for female fish and 0.9219 for male fish, this means that the growth of juaro fish in the Siak River shows negative allometric properties Even though there has been a decrease in the waters quality of the Siak River which exceeds the water quality standards, these conditions are still suitable for the growth of the length-weight of the juaro fish which supports the availability of food for the juaro fish, which the juaro fish have opportunistic characteristics, so that these fish can take advantage of all the available food availability. located in the waters of the Siak River.