Abstract
Cadmium is a metal that has high toxic effects in high and low concentrations. The presence of cadmium will adversely affect the biological processes of aquatic organisms, mainly carp, which can threaten the sustainability of their lives, including humans, through the food network. Lau Kawar Lake was formed several thousand years ago when lava flowed from the Sinabung volcano and covered the Tupin River. This study aims to analyze the level of cadmium in carp organs at Lau Kawar Lake, Karo Regency, North Sumatra. The samples were taken by purposive sampling three times. Metal tests were conducted by using the Atomic Absorption Spectrometry Method. The data were analyzed through the F—test using one-way ANOVA at a 95% confidence interval. The test results showed that the highest and lowest average cadmium levels were found in the kidneys and liver. The statistical data analysis obtained that the average Cd levels in each sample were not significantly different in the gills, kidneys, liver, and muscles. The results showed that cadmium was detected in organs of carp but was still in low levels because it had not passed the quality standard limit set by the FDR New Zealand, FAO, and FDA RI Regulations.
Highlights
Indonesia is known as a country that has a high biodiversity with the various richness of its waters
There are 3000 types of fish found in kind waters, of which 1300 species of fish live in freshwater in Indonesia [1, 2]
The concentration of Cd in the sample showed a value still in the low category because it had not passed the quality standard limit set by the FDR New Zealand, FAO, and FDA RI regulation
Summary
Indonesia is known as a country that has a high biodiversity with the various richness of its waters. There are 3000 types of fish found in kind waters, of which 1300 species of fish live in freshwater in Indonesia [1, 2]. Lau Kawar Lake is one of the lakes in North Sumatra, precisely located at the foot of Deleting Puncak, Kuta Gugung Village, Simpang Empat District, Karo Regency. This lake formes several thousand years ago when lava flowed from the Sinabung volcano and covered the Tupin river. Lau Kawar Lake is around 116 ha and only increased slightly after the dam builds because the sides are steep It knows that the volume of the lake water is 41.5 million m.
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