Pola Pertumbuhan dan Faktor Kondisi Ikan Oskar (Amphilophus Citrinellus Gunther, 1864) di Perairan Danau Toba, Sumatera Utara

Abstract

Oscar.fish (Amphilophus citrinellus) is aforeignfish that was introduced into the waters of Lake Toba and can be found around the waters of Lake Toba and has the potential to be invasive. This research was carried out in the waters of Lake Toba around Ajibata, Balige, Muara, Palipi and Tongging in January 2022. This study aims to determine the growth pattern and condition factors of Oscar fish and the relationship of fish density to physical and chemical factors in the waters of Lake Toba. Detennination of research location points using the "Purposive Sampling" method based on activities around the lake. Data analysis in.eludes growth patterns and condition factors of Oscar fish as well as physical and chemical facto rs of the waters. Based on the results of the research at the five stations, the growth pattern at stations 1, 2, and 4 was allometric positive (b>3) while at stations 3 and 5 was allometric negative (b<3). The value of the condition factor ranged.from 1.007015- /. 025093, -with this value, the fish, including the value of K < 2, stated that the fish body was classified as less flat. The results of the correlation test showed that there was a very strong influence, namely temperature, turbidity, phosphate and light intensity on the density of Oscar fish.