Kepadatan Populasi dan Pertumbuhan Kijing Taiwan (Anodonta woodiana) di Sungai Simangayat dan Waduk Samak Kota Pinang Kabupaten Labuhanbatu Selatan Provinsi Sumatera Utara

Abstract

Simangayat River and Samak Reservoir are two waters that have different characteristics. Both of these waters are inhabited by the Chinese Pond Mussel (Anodonta woodiana). The purpose of this study was to determine population density, growth patterns, growth parameters, and the relationship between population density of the Chinese Pond Mussel (A. woodiana) and water quality. The research method used is purposive sampling method. The research took place from September to November 2022. Chinese Pond Mussel obtained from the two study locations had a total number of 1456. The results showed that the population density in the Simangayat River was 33,870 ind/ha and in the Samak Reservoir 3,703 ind/ha. The long frequency distribution of the Chinese Pond Mussel 11-202 mm. The growth pattern at both stations is allometric negative. The results of the analysis of the growth parameters of the Chinese Pond Mussel growth at station 1 consist of a growth coefficient (K) of 1,51/year, asymptotic length (L∞) of 144.7 mm, theoretical age of shells at zero length (t0) of -1,17 year. The results of the growth parameters in the Samak Reservoir are the K value, which is 1.3/year, L∞ is 148.3 mm, t0 is -1.10 year. The results of the relationship between the population density of the Chinese Pond Mussel (A. woodiana) and water quality showed 2 parameters that were positively correlated, namely currents of 0.607 and pH of 0.683. While the parameters that have a negative correlation level are temperature -0.580, depth -0.401, brightness -0.201, DO (Dissolved Oxygen) - 0.277, and C-Organic -0.384.