en fish disease fish disease پژوهشي Orginal research papers The incidence of white spot disease in farmed <em>Penaeus indicus</em> in Busheher region was evaluated by analyzing 200 shrimp individuals between June and September, 2005. The samples were examined for clinical sign including observation of white spots on the cuticle and tissue. Samples were processed using polymerase chain reaction (Nested-PCR) test. The results showed that 24% of the samples examined were clinically positive having white spots on their cuticles. Also, 92% of the samples examined were positive in PCR examination. Furthermore, 70% of apparently healthy shrimp were positively identified using the by PCR test. Incidence, White spot disease, Penaeus indicus, Nested PCR, Clinical sign, Iran 15 26 http://jifro.ir/browse.php?a_code=A-10-23-25&slc_lang=en&sid=1 M. Afsharnasab mafsharnasab@yahoo.com 100319475328460024385 100319475328460024385 Yes A. Dashtyannasab 100319475328460024386 100319475328460024386 No V. Yeganeh 100319475328460024387 100319475328460024387 No M. Soltani 100319475328460024388 100319475328460024388 No