Status of water quality and level of trophic in Juanda Reservoir of Purwakarta Regency, West Java, Indonesia

Iis Jubaedah,Pigoselpi Anas,Toni Ruchimat,Joni Haryadi,E.S Kartamihardja,S.M Bergmann,T Peristiwady,D.F Mokodongan,C.P.H Simanjuntak,A Collins,P.G Sasmita,E Setyobudi,S.B Andi Omar,Alimuddin Alimuddin,N Hubert,Djumanto Djumanto

doi:10.1051/e3sconf/202132201016

Abstract

Juanda reservoir is one of the reservoirs located in Purwakarta Regency, West Java Province, Indonesia, whose primary function is hydropower, water resources for irrigation, industrial and drinking water, and secondary function for fisheries and tourism activities. Currently, an increase in activities around the existing reservoir has affected its water quality. In order to determine the water quality and trophic level status of the Juanda reservoir, research has been conducted within five stations during the period of August-December 2020. The water quality status includes physical, chemical, and biological parameters that compared with Store standards on Class II and III. Meanwhile, the trophic status was determined by Trophic Level Index (TLI) based on the parameters of transparency, chlorophyll-a, total nitrogen, and total phosphorus. The results show that the water quality status of Juanda reservoir has been contaminated Class III and heavily polluted Class II. The parameters that exceed include ammonia, nitrate, and BOD5. The Juanda reservoir's tropic status was in the eutrophic category, with TLI values ranging from 4.6 to 5.2.

Highlights

Fisheries activities in Juanda reservoir have grown since the reservoir began to operate and have become a source of livelihood for residents around the reservoir
Fisheries activities developed in Juanda reservoir are expected to be a value-added function for society
The research was conducted in Juanda reservoir (Jatiluhur Reservoir) on Purwakarta Regency, West Java Province

Summary

Introduction

Fisheries activities in Juanda reservoir have grown since the reservoir began to operate and have become a source of livelihood for residents around the reservoir. Human activities near the reservoir include aquaculture fisheries, fish rearing on floating net cages (Keramba Jaring apung/FNC), and fish catches. Fisheries activities developed in Juanda reservoir are expected to be a value-added function for society. Numerous fisheries activities have triggered negative impacts, such as feed waste from the FNC, which causes silting. It threatens the sustainability of fisheries and the function of the reservoir as a water source. An increase in the number of fish cultivation in FNC that exceeds the carrying capacity of the reservoir has impacted the aquaculture productivity, by a frequent number of fish biomass mortality, especially for native species [1]

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Conclusion