Veterinary Medicine

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Author: search.filters.author.Ajiboye, M. O.

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    Isolation and pathogenicity of Bacillus sp. associated with a septicaemic condition in some tropical freshwater fish species
    (Verlag Paul Parey, Hamburg und Berlin, 1994) Oladosu G. A.; Ayinla, O. A.; Ajiboye, M. O.
    Observations made over a three-year period at the Fish Diseases Laboratory of the African Regional Aquaculture Centre (ARAC), Nigeria, revealed the gradual emergence of a new, highly infectious septicaemic condition in some widely cultivated freshwater fish species. The broad host range included: Heterobanchus bidorsalis, Clarias gariepinus, “Heteroclarias” (a hybrid of these two species, male and female respectively), Chrysichthys nigrodigitatus, and Cyprinus carpio. Clinical signs and pathological lesions associated with the condition were typical, irrespective of the fish species affected; natural out- breaks ap eared to be associated with stress &e to environmental factors. The bacterium isolated from moribuncf and freshly-dead fishes was identified as a Bacillus sp., based on the observed cultural, morphological and biochemical characteristics. Fish reinfection trials confirmed that the isolate was the causative agent of the condition. Antibiotic sensitivity tests showed that the organism was sensitive to tetracycline hydrochloride.
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    Aetiology, epizotiology and pathology of ‘rusty yellow’ skin discolouration of tilapia species Oreochromis niloticus and Tilapia zilli
    (Blackwell Wissenschafts-Verlag, 1994) Oladosu G. A.; Ayinla, A,; Ajiboye, M. O.
    The presence of a rusty-yellow discolouration of the skin of the two tilapia species being cultured at the African Regional Aquaculture Centre (ARAC) was studied using clinical and epizootiological methods. The condition affected the tilapia species only. Ante-mortem and post-mortem examination revealed that the discolouration was restricted to the surface of the cutaneous tissue; affecting the underside of the exposed part of the scales, the fins, and the skin flap covering the scale pockets, mostly in adult fish. Microbiological and histopathological studies, as well as experimental infection trials demonstrated that a rosette-shaped, filamentous gram-positive bacterium, was the aetiologic agent. This organism was characterised as an Actinomyces species based on standard microbiological techniques. Correlation between physico-chemical parameters of the pond water and the prevalence of the skin discolouration, suggested a possible relationship to low dissolved oxygen. The prevalence of the skin discolouration was observed to increase over the 4-month culture period, being somewhat greater in a non-integrated than in an integrated culture system at harvest. Efforts to control the condition with available chemotherapeutics (mostly disinfectants and antibiotics) were ineffective although the organ- ism was observed to be sensitive to terramycin.
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    Pollution and health hazards of integrated livestock-cum-fish farming system in Nigeria
    (CIFA, 1994) Ayinla, O. A.; Oladosu, G. A.; Ajiboye, M. O.; Ansa, E. J.
    Adverse environmental conditions induced by beavy loading of fish ponds with livestock manure constitute serious. pollution and health hazards. Losses in form of fish mortalities, poor growth performance and outbreak of pathogenic diseases of fish and man have been observed. The extension of well documented information on the practise of integrated livestock-cum-fish-farming will go a long way in solving these problems.