This study aims to see the condition of hematocrit levels and differential leukosit after immersion of LAB Isolated and after in vivo using Aeromonas hydrophila bacterium. LAB isolated were obtained from the organs of the common carp intestine. The study used a Completely Randomized Design (RAL) consisting of four treatments and three replications. The treatment used was immersion of test fish for 24 hours in several isolates of LAB with a density of 108, namely A: without LAB isolate (control), B: isolate CcB7, C: isolate CcB8, D: isolate CcB15. Immersion is done three times with a frequency of seven days. Parameters observed included hematocrit levels, leukocyte differentiation, and survival rate. The results showed the immersion of LAB isolate CcB15 be able to give effect to increase the differential leukocytes and hematocrit levels as an indicator of carp body resistance, which is shown by high levels of white and red blood cells.
 Gunapathy Devi, Ramasamy Harikrishnan, Bilal Ahmad Paray, Mohammad K. Al-Sadoon, Seyed Hossein Hoseinifar and Chellam Balasundaram, Effects of aloe-emodin on innate immunity, antioxidant and immune cytokines mechanisms in the head kidney leucocytes of Labeo rohita against Aphanomyces invadans, Fish & Shellfish Immunology, (2019). 10.1016/j.fsi.2019.02.006
 Felix K.A. Kuebutornye, Emmanuel Delwin Abarike and Yishan Lu, A review on the application of Bacillus as probiotics in aquaculture, Fish & Shellfish Immunology, (2019). 10.1016/j.fsi.2019.02.010
 Dharmaraj Ramesh and Sami Souissi, Effects of potential probiotic Bacillus subtilis KADR1 and its subcellular components on immune responses and disease resistance in Labeo rohita, Aquaculture Research, 49, 1, (367-377), (2017).
Financed by the National Centre for Research and Development under grant No. SP/I/1/77065/10 by the strategic scientific research and experimental development program:
SYNAT - “Interdisciplinary System for Interactive Scientific and Scientific-Technical Information”.