DAO 122:67-71 (2016)  -  DOI: https://doi.org/10.3354/dao03067

NOTE
First isolation of Miamiensis avidus (Ciliophora: Scuticociliatida) associated with skin ulcers from reared pharaoh cuttlefish Sepia pharaonis 

Zhen Tao, Lu Liu, Xiangrui Chen, Suming Zhou, Guoliang Wang*

School of Marine Science, Ningbo University, Ningbo 315211, PR China
*Corresponding author:

ABSTRACT: In the winter of 2015, a skin ulcer disease outbreak occurred in a pharaoh cuttlefish Sepia pharaonis population cultured on a land-based fish farm in China. Affected cuttlefish (about 60% of the population) were characterized as having developed ulcers on the dorsal skin, fin fringe, or distal mantle tip. Masses of a ciliated protozoan were isolated from skin ulcers. The ciliate was identified as Miamiensis avidus based on the morphological features of living and protargol-impregnated specimens. This identification was also supported by high sequence similarity of the small subunit ribosomal RNA gene (100%) and another ribosomal DNA region (including the 2 internal transcribed spacers and the 5.8S gene; 99%) with published sequences of fish parasitic M. avidus strains. M. avidus is known to be a histophagous marine fish parasite. This report describes the first case of M. avidus associated with skin ulcers in a cephalopod mollusk (Mollusca, Cephalopoda). This finding suggests that M. avidus may infect a phylogenetically broader range of hosts than what has previously been reported. Furthermore, M. avidus may pose a health risk to hatchery-reared cephalopods.


KEY WORDS: Miamiensis avidus · Pharaoh cuttlefish · Sepia pharaonis · Skin ulcers


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Cite this article as: Tao Z, Liu L, Chen X, Zhou S, Wang G (2016) First isolation of Miamiensis avidus (Ciliophora: Scuticociliatida) associated with skin ulcers from reared pharaoh cuttlefish Sepia pharaonis . Dis Aquat Org 122:67-71. https://doi.org/10.3354/dao03067

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