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Utojo*), Akhmad Mustafa*) and Taruna Mulia*)
*)Researcher at Research Institute for Coastal Aquaculture,  Maros, South Sulawesi, Indonesia
M. Dg Sitakka Street No. 129, Maros, 90512 South Sulawesi, Indonesia

This study aims to stability level of traditional and intensive brackishwater pond waters through biological index calculation (diversity, uniformity and dominance) of plankton in  Probolinggo Regency, East Java Province. Sampling plankton and water from the 14 site, each considered to represent the diversity of plankton and water stability of 7 traditional and 7 intensive brackishwater pond site. Plankton was collected using a plankton net meshsize 60µ, then preserved using 1% lugol solution. Measurement of water quality variables include temperature, salinity, dissolved oxygen and pH,while parameters that was analyzed in  laboratory such as Total Organic Matter (TOM), NO2, NO3, NH3, PO4, Total Suspended Solids (TSS), and Fe. Plankton was identified using microscope and calculated with cell counting method. The results showed that in intensive brackishwater pond waters are obtained as much as 23 genus (16 genus of phytoplankton and 7 genus of zooplankton) with abundance ranges 702 - 4269 ind./L. In traditional brackishwater pond earned as much as 13 genus (10 genus of phytoplankton  and 3 genus of zooplankton) with abundance ranges 134 - 776 ind./L. Traditional and intensive brackishwater pond waters condition still within the limits that can be tolerated by the culture organism. Based on the index value of biological, diversity of genus in the intensive brackishwater pond is relatively higher than traditional brackishwater pond and the community stability moderate, whereas traditional brackishwater pond unstable. On average, the uniformity of the genus in both  brackishwater ponds are relatively evenly and genus of plankton was not dominating the others genus. Positive effects of water quality variables on the abundance of plankton in intensive pond are nitrate and phosphate, temperature, DO and pH, and negative effects are TSS, Ammonia, TOM and nitrite. Positive effects of water quality variables on the abundance of plankton in traditional pond are nitrate and phosphate, and negative effects are temperature, TOM, DO, TSS, ammonia, pH, and nitrite.    

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