DOI: https://doi.org/10.5513/JCEA01/26.4.4658
Original scientific paper
The abundance of Spirulina platensis in an intensive shrimp pond based on causal loop model analysis
2025, 26 (4) p. 905-914
Heri ARIADI, Mohammad SYAKIRIN, Tri MARDIANA, Linayati LINAYATI, Benny MADUSARI, Abdul WAFI
Abstract
Spirulina platensis is a type of plankton commonly found in tropical waters. This study aims to analyze the fluctuations in its abundance in intensive shrimp ponds using dynamic system modelling. The research employed a causal ex-post facto design, with data collected through purposive sampling prior to dynamic analysis. The findings indicate that water quality parameters were generally very good. Several plankton genera were identified, including Chlamydomonas spp., Chlorella spp., Oocystis spp., Chroococcus spp., Microcystis spp., Oschillatoria spp., Spirulina spp., Cyclotella spp., and Prorocentrum spp. Regarding abundance, chlorophyceae reached 5.40E+05 cells/ml, cyanophyceae 3.30E+05 cells/ml, chrysophyceae 1.85E+05 cells/ml, dinophyceae 3.50E+05 cells/ml, and oligohymenophorea 2.50E+03 cells/ml. Specifically, Spirulina platensis abundance was 2.00E+04 cells/ml in pond A and 1.00E+04 cells/ml in pond B. Dynamic modelling results show that a 1:10 decrease in nutrient ratio leads to a reduction in plankton biomass by approximately 10.00E+03 cells/ml. Additionally, the model indicates that at N:P ratios of 1:30 and 1:40, plankton abundance reached saturation points, effectively ceasing growth (0 cells/ml). Factors influencing its abundance include temperature, pH, water flow, and nutrient availability. In conclusion, Spirulina platensis exhibits oscillatory fluctuations in abundance over a twenty-week shrimp cultivation period, with optimal growth occurring at N:P ratios of ≤1:20. Moreover, its abundance trends are inversely related to the N:P ratio in pond waters.
Keywords
chlorophyll, feed, L. vannamei, nutrient, water quality
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