Morphological re-description of Camallanus polypteri (Nematoda: Camallanidae) infecting the African sharptooth catfish Clarias gariepinus (Clariidae)

Document Type: Original Articles


1 Zoology Department, Faculty of Science, Cairo University, Cairo, Egypt

2 Zoology Department, Faculty of Women for Arts, Science and Education, Ain Shams University, Heliopolis, Egypt

3 Zoology Department, College of Science, King Saud University, Riyadh, Saudi Arabia


Fish represents as one of the important sources of animals proteins. Different species of fish are susceptible to infections with parasites which cause severe tissue damage and cell destruction of the infected organ. Therefore, in 2019, this parasitological study was conducted to investigate the helminth parasites infecting the African sharptooth catfish Clarias gariepinus that were collected from Lake Manzala, Egypt. Only nematode parasite was reported as a prevalence of infection from the stomach of infected fish with 7.5%. Depending on the seasonal prevalence, the extent of the infection is analyzed. It is shown that the parasite infection was only reported at 15% in the winter season. Morphological and morphometric analyses of the present parasite species revealed that it possesses all the characteristics of the Camallanus genus, whereas it is closely related to Camallanus polypteri described previously, since it is characterized by the presence of a buccal capsule with longitudinal internal ridges, some of which are very short and ranged from 8-14 in male and 8-9 in female, esophagus consisted of muscular and glandular portions, the middle position of the excretory pore to the muscular esophagus, the anterior location of deirids to the nerve ring, posterior end of males with two unequal spicules and caudal papillae but it is smooth and straight in females. Additionally, some morphology and measurement differences for the different body parts were identified with other Camallanus species. Therefore, this study gives full morphologically re-description of Camallanus polypteri while with a new geographical location in the Egyptian freshwater.