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Title: Studies on some diseases of fish
Author: Al-Salim, N. K.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1980
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Littorina littorea is the only known first intermediate host for the early larval stages of Cryptocotyle lingua (Creplin, 1825). The foot becomes dark orange to brown in infected snails. Penetration and encystment of the cercariae in different parts of the body of Pomatoschistus minutus, Blennius hp olis and Crenilabrus melops were observed experimentally. This parasite is common in the Scilly Isles, where Littorina littorea is very scarce, suggesting that another intermediate host may be involved there. Blood sampling revealed Haemogregarina bigemina from the host fishes Blennius hp olis, Blennius gattorugine and Blennius galerita; Iaemogregarina simondi from Solea vulgaris; Haemogregarina quadrigemina from Callionymus lyra; Haemogregarina cotti, Haemohormidium cotti and Trypanosoma cotti from Enophrys bubalis; and Haemogregarina bothi from Scophthalmus maximus which was also infected with a previously undescribed spirochaete. No correlation was found between the presence of haematozoa and fish-leeches, in the different areas from which samples were taken. Ulcerative dermal necrosis (UDN) was commonly observed affecting the lateral skin and muscles of Ciliata mustela and Gaidropsarus mediterraneus, though previously undescribed in these two species. Four types of fungi, Aessosporon salmonicolor, Cladosporium herbarum, Acremonium persicinum and a white yeast were cultured from the skin lesions. Electron micrographs suggested that the pathogen was the white yeast, possibly Candida sp. Transference of the disease from infected to healthy Ciliata mustela was induced experimentally by putting the fish together in the same tank, but no ulcers developed on other species of fish which lived together with infected rockling.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available