New host and locality records of two nematode parasites Dujardinnascaris mujibii (Heterocheilidae) and Hysterothylacium aduncum (Anisakidae) from the common seabream Pagrus pagrus: a light and scanning electron microscopic study

Abstract

In the present study, the morphology and morphometric characterization of Dujardinnascaris mujibii (Heterocheilidae) and Hysterothylacium aduncum (Anisakidae), new nematode parasites infecting the sea bream Pagrus pagrus (Osteichthyes, Sparidae), were described for the first time from the Gulf of Suez and Hurghada City of the Red Sea, Egypt. Ninety-eight (70 %) and 62 (44.2 %) out of 140 of the examined fish were naturally infected with these nematodes, respectively. The infection was investigated macroscopically by the occurrence of these parasites in the flesh, stomach, intestines, as well as their body cavities as adult and larval stages. D. mujibii is characterized by an elongated body with a length of 36.4 ± 3 (23-38) mm (female) and 20 ± 3.0 (17-24) mm (males); the head is provided with three prominent lips each with four teeth like structures and the apical lip is embossed with a regular zigzag pattern as revealed by SEM. Interlabia were present, with prominent grooves. Juvenile stage is smaller than adults and provided with a spiny mucron. H. aduncum was small, measured 22.5 ± 2.0 (20.0-24.3) mm in length (female) and 16.3 ± 2.0 (14.5-17.4) mm (male). The head region bears three large lips which were clearly separated from each other, with the apical one having two rounded ends and the space between the two adjacent lips occupied by very prominent interlabia. The present study represents new host and locality records from P. pagrus fish in Egypt.

Nematodes parasitizing Trachurus trachurus (L.) and Boops boops (L.) from Algeria

“…(Adroher et al 1996). Specimens of H. aduncum identified in this study from the two fish species T. trachurus and B. boops show the same morphological criteria as those observed by Shih and Jeng (2002) in Taiwanese coast of the Northwest Pacific and Morsy et al (2013) in the Red Sea. However, the morphometric criteria of our specimens show a slight difference compared to those reported by the same authors.…”

Molecular identification of Hysterothylacium aduncum specimens isolated from commercially important fish species of Eastern Mediterranean Sea using mtDNA cox1 and ITS rDNA gene sequences

“…In the literature, Hysterothylacium aduncum has been reported from the Northeastern Atlantic [8,9], the Mediterranean Sea [10][11][12][13][14][15][16][17][18], the Black Sea [19], the Adriatic Sea [20], the Pacific and Atlantic waters of North America [21,22], Northwest Pacific, [23] and the Pacific Ocean costs of Japan [24].…”

The parasitic fauna of Pagellus acarne (Risso, 1827) (Teleostei: Sparidae) of Béni Saf 's Bight in the West Coast of Algeria.

“…According to Hudson et al (2006), the diversity of parasites in the ecosystem is indicative of their overall health. Nematodes are considered one of the largest and most diverse groups of helminth parasites that infect marine, freshwater, and even brackish water fish (Klimpel et al, 2011;Morsy et al, 2013). Their infections cause great morbidity in humans and animals.…”