Articles, Conference and Workshop Papers Collection

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Browsing Articles, Conference and Workshop Papers Collection by Subject "Aquaculture"

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    Antimicrobial susceptibility of flavobacteriaceae isolates from nile tilapia (oreochromis niloticus) in Tanzania
    (African Journal of Microbiology Research, 2020) Mwega, Elisa; Chengula, Augustino; Colquhoun, Duncan; Mutoloki, Stephen; Mdegela, Robinson; Evensen, Øystein; Wasteson, Yngvild
    This study aimed to assess antimicrobial susceptibility of members of the family Flavobacteriaceae isolated from Nile tilapia (Oreochromis niloticus). Antimicrobial susceptibility of 67 Flavobacteriaceae isolates originating mainly from ponds and Lake Victoria against 19 antimicrobial agents was determined by the broth micro dilution method. Overall, most isolates were susceptible to enrofloxacin (97%; MIC 90 2 μg/ml) followed by novobiocin (85%, MIC 90, 4 μg/ml) and the aminoglycoside streptomycin (85%; MIC 90 , 128 μg/ml). Some isolates were also susceptible towards trimethoprim/sulfamethoxazole (77.6%), neomycin and florfenicol both at 62.7%. Susceptibility levels were low for tylosin tartrate (32.8%), clindamycin and sulphathiazole both at (23.9%), ceftiofur (6%), spectinomycin (6%) and tetracyclines/oxtetracyclines (4.5%). In contrast, β-Lactams (amoxicillin, penicillin), gentamycin and erythromycin exhibited very poor activity against Flavobacteriaceae isolates. The extent of antimicrobial susceptibility did not vary significantly among isolates from farmed and wild fish isolates (P > 0.01). The highest Multiple Antimicrobial Resistance (MAR) index was observed in Chryseobacterium indologenes (0.89) and the lowest in Chaetoderma indicum isolates (0.32). Our results indicate that most of Flavobacteriaceae isolates are multidrug resistance, and this may be associated with intrinsic resistance mechanisms to a broad range of antimicrobial agents. However, the need remains to carryout in-depth study to understand better the underlying genetic mechanisms given that the magnitude and trend for susceptibility was comparable between isolates from aquaculture and fisheries. The findings from this study give us insight into appropriate choice of antimicrobial agents for effective treatment of infections caused by these isolates.
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    Tilapia lake virus threatens tilapines farming and food security: socio-economic challenges and preventive measures in Sub-Saharan Africa
    (TANZANIA VETERINARY ASSOCIATION, 2017) Hounmanou, Y. M. G.; Mdegela, R. H.; Dougnon, T. V.; Achoh, M. E.; Mhongole, O. J.; Agadjihouede, H.; Gangbe, L.; Dalsgaard, A.
    Tilapiais a traditional and favorite dish in almost all countries of Sub-Saharan Africa (SSA) and the second most produced fish worldwide. A deadly viral disease caused by Tilapia Lake Virus (TiLV) currently threatens tilapia production. This study aimed to describe TiLV disease, discuss its related socio-economic impacts in SSA, and envisage preventive measures applicable in SSA countries. PubMed, Web of Science, Scopus, Google Scholar and Research Gate were searched. Results reveal that TiLV is an RNA virus causing the disease of over 90% mortalities in tilapia. It attacks early developmental stages of tilapia, transmitted horizontally between fish, and is a potential trade-influencing transboundary animal disease. It is currently confirmed in six countries: Ecuador, Israel, Colombia, Egypt, Thailand and Taiwan. 10 SSA countries have likely imported TiLV infected tilapia fingerlings from hatcheries in Thailand and Tanzania, Burundi, Congo, Mozambique, Nigeria, Rwanda, South Africa, Togo, Uganda, and Zambia are suspected infected with TiLV. Approximately 6 Million jobs with subsequent 18 million livelihoods are expected to be affected. Food insecurity is likely to hit over 400 Million lives in the course of TiLV disease. An estimate of US$ 3 billion per year could be lost in SSA countries due to TiLV. In SSA, technologies to achieve effective control of TiLV based on measures suggested by OIE, and FOA do not exist. There is a crucial need for capacity building among farmers and technical personnel on prompt diagnostic procedures and effective remedial action and establishment of outbreak response systems.