Abstract:
Decreasing of water quality and exceeding the loading capacity of water pollution are the main causes of the
high mortality of cage aquaculture along the river in South Kalimantan province. The research objective was
to analyze the river water quality profile, and to evaluate the loading capacity of water pollution around the
cage aquaculture. The observations were made at 3 points (upstream, middle and downstream) along Harus
river where is the center for the development of cage aquaculture in Banua Lawas District, Tabalong
Regency. On each of these points, measurement of physico-chemical parameters of water and flow rates were
carried out. Measurement and data collection were performed twice with intervals between measurements for
30 days. Water quality parameters analyzed were water temperature, pH, TSS, NH3-N, NO3-N, PO4-P, BOD,
COD, and DO. Based the eight water quality parameters measured, there were three parameters that tend to
exceeding the loading capacity of water pollution on all the river segments, namely PO4-P, (at middle = 16 kg
day-1
, and downstream = 459 kg day-1
), BOD (at upstream = 301 kg day-1
, middle = 547 kg day-1
, and
downstream = 2,086 kg day-1
) and COD (at upstream = 521 kg day-1
, middle = 380 kg day-1
and downstream
= 1,249 kg day-1
). Exceeding the load capacity of BOD and COD were prone to cause depletion of DO in the
river in which can potentially cause massive fish mortality.
Description:
Water pollution control related to efforts to
reduce the burden of organic and inorganic
pollution must be carried out in an integrated
manner involving various government agencies /
institutions. Because the problems faced are the
result of contributions from various activities, so
cross-sectoral handling is needed. This
management body should have clear authority
over the water body being managed.
An inventory and mapping of environmental
conditions is needed to facilitate the management
and direction of land use, which includes the
unity of the area from upstream to downstream.
