Abstract
ABSTRACT —A fungal infection was found in eggs and larvae of black tiger shrimp Penaeusmonodon at a hatchery in Chachensao Province, Thailand in August 2000. Fungi were isolatedfrom eggs and larvae with fungal infection, and studied on the morphological and biological charac-teristics. When it was transferred from PYGS broth to artificial seawater, discharge tubes devel-oped from the mycelia, and a vesicle for zoospore formation was produced at the top of eachdischarge tube. The characteristic feature of an asexual reproduction of the fungus was thatzoospores swam away in seawater after the vesicle separated from the discharge tube. Based onthese morphological characteristics, the fungus was identified as Lagenidium thermophilum.Some biological characteristics of the selected isolate NJM 0031 were compared with the otherspecies in the genus Lagenidium isolated from some crustaceans. As a result, the isolate NJM0031 showed similar characteristics to those of L. thermophilum ATCC 200318 isolated from man-grove crab Scylla serrata. The isolate was demonstrated to be pathogenic to larvae of black tigershrimp by artificial infection. This is the first report of L. thermophilum infection in black tigershrimp in Thailand.
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