EVALUATION OF SOME FACTORS CAUSING THE BLOOM OF OSCILLATORIA IN SHRIMP (LITOPENAEUS VANNAMEI) INTENSIVE FARMING POND IN SITUBONDO, INDONESIADian Aliviyanti, Catur Retnaningdyah, Rarasrum Dyah Kasitowati and Muhammad A. Asadi
The development of the world of fisheries, especially the shrimp farming sector, is currently experiencing an increase, both on national and international scale. However, the application of technologies that are not environmentally friendly can cause a decrease in water quality and initiate a bloom of the CyanoHABs group, like Oscillatoria bloom during cultivation cycle in intensive shrimp farming ponds in Situbondo Thus, this study aimed to analyze the determinants of Oscillatoria blooming in Ponds. The research method was carried out through determining the interaction model of Oscillatoria population dynamics with environmental variables and continued with structural modeling analysis using the WarpPLS application Ver. 5.0. Sampling of environmental variables were carried out every week for four cultivation cycles, which was between March 2015 and June 2016. Observed environmental variables were including the profile of the plankton community structure, water quality (alkalinity, TOM, nitrite, total phosphate, and dissolved phosphate) and climate (precipitation and season). Structural model analysis results showed a valid predictive-relevance (Q2) value of 97.89% and based on the results of the final PLS model, the Oscillatoria dynamics profile is directly influenced by the phosphate profile of the waters with a coefficient value of 0.483***. The water soluble phosphate variable is directly influenced by the climate profile and water chemistry factors with the coefficient values of -0.397*** and 0.485***, respectively.