The Sublethal Effects of Tannery Wastewater Exposure on Oxygen Consumption Levels and Operculum Movement of Indonesia Mahseer Fish

This study aimed to analyze the effect of tannery wastewater exposure of Padang Panjang, Indonesia, on the level of oxygen consumption (OC) and the operculum movement of the Mahseer fish (Tor tambra CV). Mahseer is an endemic fish in the BatangAnai River in West Sumatra Province. The study is started by determining the acute toxicity value of LC50-96h using a static method within 96 hours of observation. Based on the results of the Probit Method, the LC50-96h amount of mahseer was 15.41%. Furthermore, variations in the wastewater concentration were 0%, 10%, 20%, and 30% of the LC50-96h value. Observations were carried out for 30 days in triplicate. Based on OC value, the concentration of 10%, 20% and 30% has decreased by 0.13 mg O2/g.hours; 0.18 mg O2/g.hours, and 0.27 mg O2/g.hours consecutively otherwise in control, treatment increased by 0.05 mg O2/g. While the operculum movement, the concentration of 10%, 20%, and 30% have increased by 90 times/minute, 108 times/minute, and 116 times/minute, respectively. In control, treatment has risen by 44 times/minute. OC's correlation value and mahseer's operculum movement ranged from 0.94 to 0.97, which means the correlation was reliable. The significance value obtained p <0.05, which means that there were significant differences in OC values and movements of the mahseer's operculum.