Ceratomyxa aegyptiaca n. sp. (Myxozoa: Myxosporea) from the gall-bladder of Solea aegyptiaca Chabanaud (Pleuronectiformes: Soleidae) in a Tunisian coastal lagoon

Abstract

A new marine myxosporean species, Ceratomyxa aegyptiaca n. sp. is described from the gall-bladder of Solea aegyptiaca Chabanaud collected from the Ghar El Melh Lagoon in northeastern Tunisia. Mature spores are elongate and crescent-shaped, measuring 8-11 μm in length and 48-58 μm in width. The polar capsules are spherical, 3.2-4 μm in diameter and equal in size. Trophozoites are polysporous and float free in the bile or are attached on the epithelium of the gall-bladder. Morphological data and molecular analysis based on 18S rDNA sequences are provided. The 18S rDNA of C. aegyptiaca is readily distinguishable from that of other myxozoan species, as the genetically most similar myxozoan parasite, C. seriolae Yokoyama & Fukuda, 2001 (AB530265) collected from Seriola quinqueradiata Temminck & Schlegel in Japanese waters, shares with it only 67.5% identical nucleotides over a 1,680-bp long fragment of 18S rDNA.

Ceratomyxa tunisiensis n. sp. (Myxosporea: Bivalvulida) from the Gallbladders of Two Carangid Fish Caught Off the Coast of Tunisia

“…A similar situation has been reported for other Mediterranean species such as C. aegyptiaca from the gallbladder of Solea aegyptiaca Chabanaud in a Tunisian coastal lagoon, Sphaerospora dicentrarchi from the sea bass, Dicentrarchus labrax (L.) Sitja‐Bobadilla et Alvarez‐Pellitero 1992 , Zschokkella soleae Yemmen, Marton, Bahri et Eszterbauer, (Sitja‐Bobadilla and Alvarez‐Pellitero ; Yemmen et al. , ). Conversely, for other myxozoa, the prevalence in summer is the lowest while the highest prevalence occurs in autumn, as the cases with Ceratomyxa hamour from the Arabian Gulf and C. buri and Myxobolus spirosulcatus from the cultured carangid Yellowtail S. quinqueradiata (Alama‐Bermejo et al.…”

“…So far, only C. aegyptiaca Yemmen, Marton, Eszterbauer, and Bahri, 2012 have been described from lagoon fish hosts in Tunisia, and this species differs from ours in having far larger spores (10 9 51.3 vs. 6.4 9 22.9) (Yemmen et al 2012).…”

Seasonality of Amyloodinium ocellatum Brown 1931 (Dinophyceae) infesting the Senegalese sole Solea senegalensis from Bizerte lagoon, Tunisia

“…; Marques, Santos & Cabral ; Durieux ; Derbel & Neifar ; Yemmen, Ktari & Bahri ; Yemmen et al . , ). In Tunisia, data on protozoan parasites of soleidae fish are limited to the study of Yemmen et al .…”

“…The first presentation of this dinoflagellate on soleid fish from Tunisian waters was reported by Yemmen et al . . Amyloodinium ocellatum has been detected also on S. senegalensis from Portuguese fish farms causing high mortalities (Soares et al .…”

Molecular and morphological characterisation of two species of the genus Ellipsomyxa Køie, 2003 (Ceratomyxidae) from the gall-bladder of Liza saliens (Risso) off Tunisian coasts of the Mediterranean

“…exhibited the highest prevalence of infection in summer as the temperature of water increases when the host moves to coastal lagoons and estuaries and this is in accordance with the pattern observed in E. mugilis. Several studies have shown similar seasonal and annual variation in the prevalence of myxosporean species in the Mediterranean (Yemmen et al, 2012;Yemmen et al, 2013;Thabet et al, 2015). These variations can be influenced by a number of factors including host availability and ambient temperature which influences parasite development, as well as the presence of an intermediate host in the life-cycle (Foott & Hedrick, 1987;Kent et al, 2001;Yokoyama & Fukuda, 2001;Alama-Bermejo et al, 2013).…”