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The study aimed to determine how different culture mediums affected the growth and morphology of the testate amoeba Arcella gibbosa Penard, 1890 in the laboratory. This study experimented with two main ways of culturing (MWC and distilled water with rice). The results revealed that Arcella gibbosa had shell diameter (42.12 - 59.10 µm), shell height (27.14 - 37.14 µm), and mouth diameter (8.12 - 21.01 µm). Comparing the species density of Arcella gibbosa over time in intermittent growth circumstances showed that the species density in distilled water with rice was much greater than in MWC medium. Distilled water medium supplemented with rice was shown to be more suited than MWC medium for growing Arcella gibbosa. The findings of this study would serve as the basis for further investigations into the construction of a collection of strains, strains of organisms that are difficult to culture in the laboratory, as well as research studies on environmental toxicity and biomarkers...

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This study presents result from the effects of using probiotics compared with antibiotics on the time of metamorphosis, growth, survival rates, gut microflora and some dangerous diseases (MBV, WSSV, YHV, HPV). After 25 cultured days, time of transition from larvae to postlarvae lowest (in NT2) of nauplius when using probiotics was 211±0.44(h). Growth characteristics of postlarvae total length (PL1) to PL15 in NT2 to 6.6±0.09% (p > 0.05). Growth characteristics of Postlarvae volume PL1 to PL15 in NT2 21.5 ± 0.22%/days were the highest. Survival rate of shrimp from 60.6 to 67% in the treatments by probiotic (p > 0.05). The highest density of bacteria in treatment 2 (NT2) (68,000 ± 5291.5 cfu/PL). By PCR analysis, the appearance of MBV, WSSV, YHV, HPV on all the treated studies was not found. The results demonstrated that probiotics (Viprotech 2ppm, EMT 2ppm, PC2 1ppm) improved the growth of white shrimp in the same period.