Abstract:
Maninjau Lake utilization for the development of fish farming system floating net (KJA) already exceeded the carrying
capacity of the number KJA waters in 2012 as many as 15 860 plots are used to maintain tilapia and carp, so the impact of
organic matter pollution load is high enough. Water quality research and loading of organic matter and its distribution has
been carried out in Maninjau Lake in July 2013. Quality of the surface water dissolved oxygen at each station showed
almost the same conditions ranged from 5.70 to 6.77 mg/L, except for dissolved oxygen at a depth of 15 meters ranged
from 3.26 to 4.12 mg/L, pH ranged between 8-10, low brightness range between 1.2-2.0 meters and electrical conductivity
ranges quite high ranging from 33.66 to 45.32 ms/cm. Total organic content (TOM) on Koto Malintang station at 19.94 mg/L,
Koto Kaciek station at 16.69 mg/L, Bayur 9.32 mg/L, the station on the lake outlets Hydropower Intake of 9.35 mg/L and
Sigiran station at 14.10 mg/L. TOM accumulation in Maninjau Lake was 10.59 mg /L or 53.10% of the incoming load of KJA.
KJA organic load of waste since 2001-2012 in Maninjau Lake have accumulated as much as 167,790.91 tons per year as
the average load 13982.57 tons.
