Translator Disclaimer
1 December 2018 Measurement of Tunic Hardness in an Edible Ascidian, Halocynthia roretzi, with Remarks on Soft Tunic Syndrome
Author Affiliations +
Abstract

The infection caused by a kinetoplastid flagellate, Azumiobodo hoyamushi, in an ascidian, Halocynthia roretzi, results in softening of the tunic, and finally death. This disease is usually recognized using palpation of the softening tunic, and A. hoyamushi infection is detectable using microscopy or PCR amplification of specific gene fragments. The present study is the first quantitative evaluation of the symptoms of soft tunic syndrome by measuring the amount of bending (bending) and the peak force required to pierce the tunic (force). There was a strong correlation between bending and force. Correlation analyses among other parameters (ascidian total weight, tunic thickness, and tunic water content) indicated that larger ascidians had harder and thicker tunics with a higher water content. As compared to the tunic of healthy individuals, softened tunic was thinner and had lower water content. Infected tunics thus possibly lose water and become softer and thinner. Mechanisms for maintaining the appropriate water level content may be crucial for preventing tunic softening.

© 2018 Zoological Society of Japan
Euichi Hirose, Kei Nakayama, Tetsuya Yanagida, Akatsuki Nawata, and Shin-Ichi Kitamura "Measurement of Tunic Hardness in an Edible Ascidian, Halocynthia roretzi, with Remarks on Soft Tunic Syndrome," Zoological Science 35(6), 548-552, (1 December 2018). https://doi.org/10.2108/zs180072
Received: 19 April 2018; Accepted: 29 May 2018; Published: 1 December 2018
JOURNAL ARTICLE
5 PAGES


SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top