The effectivity of using humic acid and fulvic acid from quickstick (Gliricidia sepium) compost to slow down lead (Pb) accumulation in red tilapia (Oreochromis sp.) cultivated in ex-tin mine waters

Robin, S.Pi., M.Si., - and Eddy Supriyono, - and Kukuh Nirmala, - and Ridwan Affandi, - and Dedi Jusadi, - (2020) The effectivity of using humic acid and fulvic acid from quickstick (Gliricidia sepium) compost to slow down lead (Pb) accumulation in red tilapia (Oreochromis sp.) cultivated in ex-tin mine waters. Journal of Environmental Research and Protection, 17 (2). pp. 12-26. ISSN 2248-3128

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Abstract

Abstract. The global demand for tin (Sn) is partially fulfilled by Indonesia. In Indonesia, one of the locations for tin exploration is in the Bangka Belitung Islands Province. Mining in this province has been conducted on land, but because the tin ore supply on land has significantly decreased, the mining is beginning to be conducted on the coast. The effects of mining on the land are the formation of large and deep water-filled pits in the ground. These pits are locally known as kolong. Utilizing kolong water as a source of water for freshwater fish aquaculture is hindered by lead (Pb) contamination; therefore, there needs to be conducted depuration and prevention of accumulation in the fish during the time the fish are raised in the kolong. The purpose of this study was to test the ability and determine the best dose for the G. sepium compost to prevent the accumulation of Pb in red tilapia (Oreochromis sp.) cultivated in a kolong. The method employed was mixing the G. sepium leaf compost into the test feed for the fish (as a feed additive). The fish which had an average weight of 10±0.01 g were raised for three months in 20 cage units. Each cage unit was 1.5×1×1.5 m 3 in size and the stocking density was 50 fish unit . A the end of the experiment, the Gliricidia sepium leaf compost mixed in the feed as a feed additive was able to prevent or slow down Pb accumulation in red tilapia raised in the ex-tin mine kolong. The 40 g kg dose was the best in preventing or slowing down the accumulation of Pb in red tilapia cultivated in the Pb-contaminated waters. Key Words: kolong, humic acid, fulvic acid, compost, depuration, tin mine.-1-1 . The method employed was mixing the G. sepium leaf compost into the test feed for the fish (as afeed additive). The fish which had an average weight of 10±0.01 g were raised for three months in 20cage units. Each cage unit was 1.5×1×1.5 m3 in size and the stocking density was 50 fish unit -1. A theend of the experiment, the Gliricidia sepium leaf compost mixed in the feed as a feed additive was ableto prevent or slow down Pb accumulation in red tilapia raised in the ex-tin mine kolong . The 40 g kg -1 dose was the best in preventing or slowing down the accumulation of Pb in red tilapia cultivated in thePb-contaminated waters

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