| Abstract | The aim of this study is to find out the composition and conditionÃÂ of phytoplankton in theÃÂ white shrimp (L. vannamei) cultureÃÂ inffected by theÃÂ whiteÃÂ fecesÃÂ disease so that one of the indicators of the onset of the white feces disease can be known. This research uses descriptive methods. The observed parameters are the identification of species diversity, abundance, diversity index and dominance index of phytoplankton. The sampling was conducted at three locations, Tuban area, Situbondo area, Lamongan area. The results of the study showed observations in LamonganÃÂ area, the total abundance of phytoplankton was 473 cells/L.SitupondoÃÂ areasÃÂ abundantity of phytoplankton total was 633 cels/L and TubanÃÂ areasÃÂ abundance was 887 cells/L. In LamonganÃÂ area, the diversity index was 1,009. In SitubondoÃÂ areasÃÂ diversity Index was 1,013. In TubanÃÂ area, diversity indexes were 1,082. In LamonganÃÂ area, a dominance index was 0.477. In SitupondÃÂ area, it was obtained a domination index of 0.544. The genus that dominates the threeÃÂ ponds areÃÂ Cyclotella and Navicula. At all three locationsÃÂ haveÃÂ high variety of species and abundance of the genus members of the filum Cyanophyta and Bacillariofhyta are detrimental, the genuses that are found are indicators of contaminated waters.ÃÂ The dominance of Cyanophyta (blue-green algae) is also an indicator of the White Feces Disease. |
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