An ultrastructural study of Myxobolus exlguus Thelohan, 1895 (Myxosporea) from grey mullet, Crenimugil labrosus (Risso) |
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| Authors: | ANN PULSFORD R A MATTHEWS |
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| Institution: | Marine Biological Association of the United Kingdom, The Laboratory, Plymouth, U.K.;Unit of Fish Diseases, Department of Biological Sciences, Plymouth Polytechnic, U.K. |
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| Abstract: | Abstract. An ultrastructural study of Myxobolus exiguus Thelohan, 1895 using interlamellar and subdermal plasmodia from thick-lipped grey mullet, Crenimugil labrosus , revealed differences in the structure of the plasmodia and host tissue reaction. Both plasmodia showed structural evidence of pinocytotic activity, but the surface area of subdermal plasmodia was considerably increased by digitiform extensions of the ectoplasm. A filamentous glycocalyx was a feature of the surface membrane of plasmodia, being more distinct on the interlamellar form. Sporo-genesis involved two morphologically distinct types of generative cells, producing a disporous pansporoblast. Mature spores were oval, measuring 9-0 μ m×7.5 μ m. Sporogenesis and capsulogenesis were essentially similar to other myxosporea. In the juvenile fish examined the host tissue reaction was slight, involving hyperplasia of epithelial cells associated with interlamellar plasmodia and some collagen deposition and localized melanization associated with subdermal plasmodia. |
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