WATER QUALITY STATUS USING THE TROPHIC INDEX (TRIX) VALUES IN THE COASTAL WATERS OF SUMBERKIMA VILLAGE, BULELENG PROVINCE OF BALI
Iis Triyulianti*, Eghbert Elvan Ampou, Dessy Berlianty, Vivi Eka Indrayani, I Gede Adi Swastana

Research Center of Deep Sea and Research Center of Oceanography, BRIN

Abstract

Water quality can be assessed utilizing physical, chemical and biological parameters in marine coastal waters. The assessment of water quality in this research was using trophic index (TRIX) value as a piece of basic information that is needed in terms of aquatic management resources. TRIX value giving us the depiction of water enrichment by nutrients that cause the increase of water productivity. The objective of this research was to determine the status of water quality by using the value of the TRIX index in coastal waters of Sumberkima Village, Buleleng, Province of Bali. The TRIX values were calculated from the result of nutrient and the level of transparency waters measurements includes biological activities in those water columns. The calculation uses a linear logarithmic combination of 4 variables were Chlorophyll-a, the concentration of dissolved oxygen, Total Nitrogen (Nitrate, Nitrite, Ammonia) and Phosphate. The range value of the TRIX index for water quality status in marine coastal of Sumberkima Village waters were 3,11 - 3,77 for all stations. Those TRIX index values showed the water quality status in the coastal waters of Sumberkima Village was in Low Tropic Level or Oligotrofic condition. The Low Tropic Level indicating values lower than 4 TRIX units are associated with scarcely productive coastal waters.

Keywords: Water Quality, TRIX index, Sumberkima, Oligotrofic, Coastal

Topic: Marine Hazard, and Coastal Protection