Vol. 41 No. 2, 2002

Hysterothylacium aduncum (Nematoda: Anisakidae) Infecting a Herbivorous Fish, Siganus fuscescens, off the Taiwanese Coast of the Northwest Pacific

Hsiu-Hui Shih1,* and Ming-Shiou Jeng2

¹Department of Zoology, National Taiwan University, Taipei, Taiwan 106
²Institute of Zoology, Academia Sinica, Taipei, Taiwan 115

Hsiu-Hui Shih and Ming-Shiou Jeng (2002) Hysterothylacium aduncum (Rudolphi, 1802) infecting a herbivorous fish, Siganus fuscescens, and 1 invertebrate zooplankton, a chaetognath, is reported off the Taiwanese coast of the Northwest Pacific. Third-stage larvae were found in the body coelom of the chaetognath, Sagitta sp. Fourth-stage larvae and adults were recovered from the stomach and intestines of S. fuscescens. Nematodes are described, measured, and illustrated. The prevalence of parasitic infection, mean intensity, and abundance were calculated from samples collected from 2 different Taiwanese coastal locations. The life cycle of H. aduncum, involving the host species considered, is also postulated.

Key words: Hysterothylacium aduncum, Siganus fuscescens, Rabbitfish, Sagitta sp., Chaetognath.

*Correspondence: Tel: 886-2-23630231 ext. 3818. Fax: 886-2-23636233. E-mail: shihhh@ccms.ntu.edu.tw