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- Ultrastructural description of Ceratomyxa tenuispora (Myxozoa), a parasite of the marine fish Aphanopus carbo (Trichiuridae), from the Atlantic coast of Madeira Island (Portugal)Publication . Casal, Graça; Costa, Graça; Azevedo, CarlosThe first ultrastructural description of Ceratomyxa tenuispora Kabata, 1960 (Myxozoa, Bivalvulida) from Madeira Island (Portugal), a parasite found in the gall bladder of the commercially important black-scabbard fish, Aphanopus carbo Lowe is presented. This parasite possesses spherical to ellipsoidal disporous trophozoites. Spores have a central crescent-shaped body averaging 11.0 µm in length, 28.5 µm in thickness and 12.1 µm in width. The valves have two long opposite lateral processes (ribbon-like structures or tails), each averaging 173 µm in length. The total thickness of the spore averages 375 µm. The spore has two sub-spherical polar capsules (∼5.2 × 4.1 µm), each with a polar filament with 7 to 8 coils. Some ultrastructural aspects of the sporogonic stages are described. The trophozoites develop without contact with epithelial cells. The cytoplasmic membrane has numerous evenly distributed external slender projections about 0.3 to 0.7 µm long. The sporogenesis produces two spores without pansporoblast formation. In the matrix of the capsular primordium, microtubules with an unusual organisation were observed. A binucleate sporoplasm that contains several sporoplasmosomes and dense bodies fills the spore cavity and extends to the tails without penetrating them.
- Parasites of the black scabbard fish Aphanopus carbo Lowe, 1839 from MadeiraPublication . Costa, G.; Eiras, J. C.; Mckenzie, K.; Berland, B.In ninety specimens of black-scabbard fish, Aphanopus carbo, examined from October 93 to October 94, five different helminth parasites and a myxosporean species were found infecting the digestive tract and gonads. Larval stages of Eucestoda, Trypanorhyncha, Tentacularia coryphaenae Bosc, 1802, Sphyriocephalus tergestinus Pintner, 1913 and Nybelinia lingualis (Cuvier, 1817) Poche, 1926 were found infecting the stomach mucosa, with prevalences reaching 13.3%, 5.6% and 3.3% respectively. Larval stages of the acanthocephalan Bolbosoma sp. Porta, 1908 (probably Bolbosoma vasculosum Rudolphi, 1819) attached to the external wall of stomach, intestine and gonads reached a prevalence of 45.6% and larval stages of the nematode Anisakis sp. Dujardin, 1845 was found infecting the viscera of all the fish examined, particularly the external walls of stomach and intestine. Spores and plasmodial stages of the myxosporean, Ceratomyxa tenuispora Kabata, 1960 were found in the gall bladder, with prevalence reaching 39.4%. All parasites, except the myxosporean, are first records for the black-scabbard fish.