Abstract:
A research on vertical profile of Phosphate and Chlorophyl-a around floating cage
area in the Bandar Khayangan Reservoir, Riau Province has been conducted on
August 2011. This research aims to understand the vertical profile of phosphate and
chlorophyll-a and trophic status of the water. Water samples were collected from 3
stations, namely station 1 ( in the upstream of the floating cage area), station 2 (in
the floating cage area) and station 3 (downstream of the floating cage area). There
were 2 sampling sites in each station, in the surface and in 2.5 secchi depth.
Sampling was done three times, once a week. Results shown that Phosphate content
in the surface was lower than that of the 2.5 secchi depth. In contrast, the
chlorophyl-a in the surface was higher than that of the 2.5 secchi depth. Phosphate
content in the surface was ranged from 0.09-0.15 mg/l, in 2.5 secchi depth was 0.09-
0.28 mg/l. Chlorophyll-a in the surface was 16.04-31.55 mg/l and in 2.5 secchi
depth was 12.54-21.84 mg/l. Transparency was 53.0-68.3 cm, depth was 1.8-3.51 m,
water temperature was 29.6-30.3oC, pH 5.5, dissolved oxygen was 4.5-6.0 mg/l and
CO2 was 4.7-8.0 mg/l. Based on data obtained, it can be concluded that the water of
the Bandar Khayangan Reservoir was very productive and able to support aquatic
organisms living in that dam.
