Abstract
The aims of study are to analyze the effect of dissolved nitrate and phosphate content of the intensive shrimp farming pond Situbondo to maximum growth rate and carrying capacity of Oscillatoria population density in the laboratory. This is an experimental research method using completely randomized design with three replications. The treatment were variation of nitrate and phosphate concentration (N0; N6; N12; N24; N48; P0,2; P0,4; P0.8, P1.6 mg.L -1 ). Experiment was done using a pure Oscillatoria culture in condition 25 watt lamp; 12 hours a day. The initial amount of Oscillatoria cells used for the treatment is 8 – 15 x 10 4 cell.mL -1 . During the incubation process, chemical parameters were also observed including nitrate, phosphate, DO, and pH at the beginning of the incubation period. Oscillatoria cell was count every day until stationary phase for 30 days. Furthermore, a different test between treatments was conducted to determine levels of nitrate and phosphate in triggering the blooming of Oscillatoria using Oneway ANOVA analysis with SPSS Program. The results showed that the intensive shrimp pond waters of Situbondo already contain dissolved phosphate between 0.4 - 0.5 mg.L -1 . Oscillatoria growth is strongly influenced by dissolved phosphate content in waters, phosphate levels of 0.2 - 0.4 or equivalent to the actual level of 0.6 - 0.7 mg.L -1 can cause the highest abundance of Oscillatoria that could endanger the ecosystem. Keywords: dissolved phosphate, intensive shrimp farming, Nitrate, Oscillatoria .
Highlights
Nitrates and phosphates are essential components that determine the primary productivity of the water
In the intensive shrimp farming pond system, both compounds have been fulfilled on the content of artificial feed that was applied during the cultivation takes place
Intensive shrimp farming pond Situbondo waters are known to contain nitrate with levels ranged from 0.07 - 0.42 mgL-1 and dissolved phosphate ranged from 0.4 to 0.5 mgL-1
Summary
Nitrates and phosphates are essential components that determine the primary productivity of the water. The utilization of nitrates by organisms aims for the formation of biomass, as a component of amino acids, and various proteins from the synthesis [1]. In the intensive shrimp farming pond system, both compounds have been fulfilled on the content of artificial feed that was applied during the cultivation takes place. Over the long period of shrimp cultivation cycle, there has been an increased content of organic matter in the waters. The content of organic materials in the pond ecosystems comprised of dissolved nitrate and phosphate, which is generally derived from shrimp feed residues that were applied during cultivation process [3]. Based on the results of weekly monitoring during the four cultivation cycles in intensive shrimp (Litopenaeus vannamei) farming ponds Situbondo, it is known that Oscillatoria has a high density and susceptible population explosion [5]
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