VERTICAL-HORIZONTAL WATER QUALITY PROFILES OF BATUR LAKE, BANGLI DISTRICT, BALI SUPPORTING SUSTAINABLE LAKE MANAGEMENT
Abstract: Batur Lake located
in Bangli District is one of fisheries-basedregions in Bali with niletilapia as
the main cultured species. Monitoring on environmental conditions of the lake
was carried out to get the vertical and horizontal water quality profiles of the
lake. Climatology condition of the area was also presented in the study. The
study area were between 8o13’-8o18’ S and 115o22’-115o26’ E. Field survey was
done with random and transect sampling points distribution. The water quality
monitored in the lake essential ly covers important parameters such as depth,
transparency, temperature, pH, dissolved oxygen, salinity, nutrients (ammonia,
nitrate, nitrite, and phosphate), sulfide, chlorophyll, and planktonic
composition. Results of spatial analysis (vertically and horizontal ly) of
water quality indicated that oxygen concentration up to 10 m deep is still
appropriate for nile tilapia culture. Nutrient (phosphate, ammonia, nitrate,
and nitrite) contents of the lake meet the standard levels set by Ministry of Environment
of Indonesia, and were still suitable for aquaculture operation at depth 710 m.
From climatology point of view, it is known that the extreme climate occurred
in June-August resulting in water mass changes, thus, affecting aquaculture
sustainability in the lake.
Keywords: water quality;
climatology condition; Batur Lake; sustainable lake management; aquaculture
Author: Sophia Sagala, I
Nyoman Radiarta
Journal Code: jpperikanangg120040
