| Summary: | Disease caused by Myxobolus infestation was often occurred in fish aquaculture in
Indonesia, they caused a high mortality. The aim of study is 1) to identify the Myxobolus
sp. obtained of fresh water fish in Indonesia based on morphology, 2) to identify species
based on Scanning Electron Microscopy (SEM), 3) to identify species Myxobolus sp. based
on molecular study with PCR-RFLP method, and 4) phylogenetic tree based on sequencing
in 28S and 18S rDNA region. Sampel was collected from fresh water fish of Central Java,
East Java, Bali, Papua, Riau and West Kalimantan. Fresh water fish with unclosed
operculum and high mortality in the juvenile was used as a sample. The spores of
Myxobolus sp. from the cyst, usually attacked gill, brain, eye, and skin. The cyst were
opened from morphological examination and stained with Lugol�s solution. The spores
were examined by wet mounts preparation, fixed with 10% of formaline solution for
histopathological examination, fixed with the glutaraldehyde for SEM, and with ethanol
absolute solution for moleculer analyses. The DNA of Myxobolus sp. was ectracted and
amplified in 28S and 18S rDNA region then analized with PCR-RFLP and rDNA
sequencing. The morphological, SEM, and histopathological result were analized with
descriptive method. The sequencing result was analized with Maximum Parsimony and
Neighbour Joining Methods to get a phylogenic tre. Based on morphology, samples from 6
regions showed a small differences in shape and size of spores. The ultrastructure of spores
showed the lining ridges with specific patterns (from Java, Pekanbaru and Merauke) and
smooth ciliated surface (from Entikong and Bali) by using SEM. Restriction product with
HaeIII, RsaI, and Bam showed a clearly differences among the samples except the samples
from Bali and the Central Java. Based on the phylogenetic tree showed that samples from
Merauke and East Java. Based on the phylogenetic tree showed that samples from Merauke
and East Java were identical with M.koi, sample from Kediri (East Java) was identical with
M.ampullicapsulatus, samples from Entikong and Bali were Myxobolus sp. Myxosoma
cerebralis have not been found from the fresh water fish in Indonesia.
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