Takagishi Nanae, Yoshinaga Tomoyoshi, Ogawa Kazuo
Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan.
Dis Aquat Organ. 2009 Sep 23;86(2):175-9. doi: 10.3354/dao02116.
Miamiensis avidus, a causative agent of scuticociliatosis in olive flounder Paralichthys olivaceus, was previously reported to proliferate the fastest in media with an osmolarity of 300 to 500 mOsm kg(-1). This suggests that hyposaline conditions can promote the development of the disease. In the present study, olive flounder constantly showed high mortalities when they were experimentally challenged with the parasite by immersion and subsequently reared in hyposaline conditions. Furthermore, affected flounder produced by the challenge showed symptoms identical to those in naturally infected flounder. It was experimentally demonstrated that hyposaline conditions can be a key factor for the development and outbreak of scuticociliatosis in olive flounder.
嗜迈阿密虫是牙鲆派琴虫病的病原体，此前有报道称，该病原体在渗透压为300至500 mOsm kg(-1)的培养基中增殖最快。这表明低盐度条件可促进该病的发展。在本研究中，将牙鲆通过浸浴用该寄生虫进行实验性攻毒，随后在低盐度条件下饲养时，牙鲆持续出现高死亡率。此外，攻毒产生的患病牙鲆表现出与自然感染牙鲆相同的症状。实验证明，低盐度条件可能是牙鲆派琴虫病发生和暴发的关键因素。
