The Plankton community structure in Rawa Pening Lake’s floating net cages and its correlation with the quality of the feed used
Abstrak
Nitrogen (N) and phosphate (P) pollution from floating net cage (KJA) is one causes of the critical condition of Rawa Pening Lake. Previous research shown that feed waste causes a load of organic matter (BOD), N, and P contamination in the waters of Lake Rawa Pening. This survey research is a quantitative descriptive approach aims to see the correlation between the quality of feed used in KJA toward N and P pollution through a plankton community structure analysis. There are three observation locations, namely in the KJA located surrounding Bukit Cinta - Banyubiru District (feed protein content 26% -28%), Jembatan Biru - Bawen District (feed protein content 31% -33%), and in the middle of ??the lake where no KJA activity as a control. Water samples from the observation location were analyzed ex situ and in situ for water quality and plankton community structure. Plankton community structure shows that in all three observation locations have been lightly polluted and are eutrophic (abundance 16,111 - 34,356 ind/L eutrophic category; H' = 2.098-2.689 medium diversity category; C = 0.066 - 0.179 medium dominance category; and E = 0.605-0.691 even category). The quality of feed used in KJA has a low correlation with plankton abundance (r = 0.289). The abundance of plankton at the observation location was positively correlated with the BOD (r = 593) and negatively correlated with the transparency level (r = 691). This means that higher the BOD value, the higher abundance of plankton and lower transparency of the lake waters. Fragilaria sp. is a potential genus of plankton to be used as a bioindicator of high BOD and nitrate in water bodies.
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