Inter-Research > DAO > v144 > p221-230  
DAO
Diseases of Aquatic Organisms

via Mailchimp

DAO 144:221-230 (2021)  -  DOI: https://doi.org/10.3354/dao03586

Morphomolecular and pathological study of Scaphanocephalus sp. in new host Siganus argenteus in the Arabian Gulf

Afaf Abdullah Mubark Al-Salem1,2, Hanadi B. Baghdadi1,2, Mahmoud A. Mahmoud3,*, Mustafa Ibrahim4,5, Elsayed M. Bayoumy6

1Biology Department, College of Science, Imam Abdulrahman Bin Faisal University, PO Box 1982, 31441 Dammam City, Saudi Arabia
2Basic and Applied Scientific Research Center, Imam Abdulrahman Bin Faisal University, PO Box 1982, 31441 Dammam City, Saudi Arabia
3Department of Pathology, Faculty of Veterinary Medicine, Cairo University, Giza 12211, Egypt
4Ministry of Agriculture, Fish Welfare Branch, El-Jubail Province, 35514 Saudi Arabia
5Animal Health Research Institute, Giza 12618, Egypt
6Veterinary Division, Hydrobiology Department, National Research Center, Giza, Egypt
*Corresponding author:

ABSTRACT: In this study, Scaphanocephalus parasite (Platyhelminthes: Heterophyidae) metacercariae were found in Siganus argenteus (forktail rabbitfish or streamlined spinefoot) in the Arabian Gulf of Jubail province, Saudi Arabia. The findings may constitute new host and locality records for this parasite. Based on the number of black spots containing parasite cysts per fish, our study indicated that Siganus argenteus had high infection intensities of encysted metacercariae belonging to the genus Scaphanocephalus. Of the 3500 S. argenteus specimens examined, 800 (22.9%) showed multiple black cysts over the entire body surface, including the membranous parts of fins, while none were seen on the internal organs. The prevalence of infection was highest in summer (June-August) (8.8%). The excysted metacercariae differed morphologically from previously identified Scaphanocephalus spp. Molecular analysis of rDNA showed 100% identity with an unnamed Scaphanocephalus sp. reported in Caribbean fish. Therefore, our findings may indicate a new species of this previously rarely recorded fish parasite. The histopathological examination revealed that the encysted parasites were restricted to the dermal layer of the skin and surrounded by melanophores and a fibrous connective tissue capsule, with focal myositis and Zenker’s necrosis in the underlying muscle tissue. The characteristically ‘winged’ parasite was clearly observed within the cysts. The high prevalence of Scaphanocephalus infection in siganid fish we detected requires further epidemiological study.


KEY WORDS: Siganus argenteus · Scaphanocephalus · Pathology · Jubail · Saudi Arabia


Full text in pdf format 
Cite this article as: Mubark Al-Salem AA, Baghdadi HB, Mahmoud MA, Ibrahim M, Bayoumy EM (2021) Morphomolecular and pathological study of Scaphanocephalus sp. in new host Siganus argenteus in the Arabian Gulf. Dis Aquat Org 144:221-230. https://doi.org/10.3354/dao03586

Export citation
RSS - Facebook - - linkedIn