Browsing by Author "Kester, C. T."

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    Assessment of the Fisheries Potential of Ero Reservoir, Ekiti State, Nigeria
    (EuroJournals Publishing, Inc, 2007) Kester, C. T.; Osofero, S. A.; Daramola, John A.
    This survey studied the catch composition of the reservoir, the Socio – economic impact of the fishing activities on the locality. The catch composition of the reservoir showed three different species, Oreochromis niloticus, Sarotherodon galilaeus, and clarias species with O. niloticus having the highest occurrence by number and weight of 83.6% and 69.2% respectively. The potential fish yield of the reservoir with a total surface area of 450ha was predicted to be 652.97 metric tones per annum, while the post calculated annual yield give a figure of 21.06 metric tones per annum. The assessment of socio – economic impact of the fishing activities of the reservoir on the fishing locality and the state at large revealed a number of operational constraint that contributed to the under – exploitation of the reservoir and fishing profession as unprofitable in the community. These constraints in conjuction with the seasonality of the catch of the more valuable Clarias spp. constituted to the factors responsible for the mass – drift of 55% of the fishermen population to other fishing villages in or outside the state and urban centers for more lucrative business. Suggestions were made towards the adoption of certain strategies of improving the income generated by the fishermen at every fishing effort to a sustainable level.
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    ItemOpen Access
    Assessment of the Fisheries Potential of Ero Reservoir, Ekiti State, Nigeria
    (EuroJournals Publishing, Inc, 2007) Kester, C. T.; Osofero, S. A.; Daramola, John A.
    This survey studied the catch composition of the reservoir, the Socio – economic impact of the fishing activities on the locality. The catch composition of the reservoir showed three different species, Oreochromis niloticus, Sarotherodon galilaeus, and clarias species with O. niloticus having the highest occurrence by number and weight of 83.6% and 69.2% respectively. The potential fish yield of the reservoir with a total surface area of 450ha was predicted to be 652.97 metric tones per annum, while the post calculated annual yield give a figure of 21.06 metric tones per annum. The assessment of socio – economic impact of the fishing activities of the reservoir on the fishing locality and the state at large revealed a number of operational constraint that contributed to the under – exploitation of the reservoir and fishing profession as unprofitable in the community. These constraints in conjuction with the seasonality of the catch of the more valuable Clarias spp. constituted to the factors responsible for the mass – drift of 55% of the fishermen population to other fishing villages in or outside the state and urban centers for more lucrative business. Suggestions were made towards the adoption of certain strategies of improving the income generated by the fishermen at every fishing effort to a sustainable level.
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    ItemOpen Access
    Fisheries potential assessment of Ero reservoir, Ekiti State, Nigeria
    (Medwell Publishing, 2009-08) Kester, C. T.; Osofero, S. A.; Daramola, John A.
    This survey studied the catch composition of the reservoir, the socio-economic impact of the fishing activities on the locality. The catch composition of the reservoir showed three different species, Oreochromis niloticus, Sarotherodon galilaeus and clarias species with O. niloticus having the highest occurrence by number and weight of 83.6 and 69.2%, respectively. The potential fish yield of the reservoir with a total surface area of 450 ha was predicted to be 652.97 metric tones per annum, while the post calculated annual yield give a figure of 21.06 metric tones per annum. The assessment of socioeconomic impact of the fishing activities of the reservoir on the fishing locality and the state at large revealed a number of operational constraint that contributed to the underexploitation of the reservoir and fishing profession as unprofitable in the community. These constraints in conjunction with the seasonality of the catch of the more valuable Clarias sp. constituted to the factors responsible for the mass-drift of 55% of the fishermen population to other fishing villages in or outside the state and urban centers for more lucrative business. Suggestions were made towards the adoption of certain
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    LISTERIA SPECIES AND OCCURRENCE IN RETAILED SMOKED FISH SAMPLES IN SELECTED OTA MARKETS, OGUN STATE, NIGERIA
    (jfewr Publications, 2024-09) Kester, C. T.; Daramola, John A.; Alao, F. O.; Chukwu, C. B
    This study investigated the prevalence of Listeria spp. in 72 samples of smoked species of codfish (Gadus morhua), herring (Clupea harengus), catfish (Clarias gariepinus) and mackerel (Scomber scombrus) sampled from Sango (SA), Oju-ore (OO), Oja-Oba, Iyana-Iyesi (II), Iju (IJ) and Atan (AT) markets, all in Ota, Ogun State, Nigeria. Adopting Oxoid Listeria Precis method, Listeria spp. were isolated and characterized morphologically and biochemically. Of the 72 samples, 8 (11.11%) tested positive. Listeria ivanovii (1.38%), L. grayi (2.78%), L. monocytogenes (2.78%) and L. innocua (4.16%) were identified in all the fish samples except Clupea harengus. Antibiotic sensitivity tests revealed all the isolates resisted Imipenem, Cefuroxime, Amoxillin and Cefexine but susceptible to Levofloxacin: 34mm (L. grayi) to 39mm (L. ivanovii), Ciprofloxacin: 25mm (L. monocytogenes) to 36mm (L. grayi) and Ofloxacin: 20mm (L. ivanovii) to 29mm (L. innocua). Occurrence of these bacteria could indict the safety of the smoked fish products for consumption. The low percentage occurrences coupled with the high antibiotic susceptibility may, however, relieve the potential consumers of the menace of the associated health risks the consumption of such fish products could pose. The required control measures to prevent the occurrence of especially Listeria monocytogenes and other species in the processing and distribution chains of these smoked fish products should be prioritized.
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    ItemOpen Access
    LISTERIA SPECIES AND OCCURRENCE IN RETAILED SMOKED FISH SAMPLES IN SELECTED OTA MARKETS, OGUN STATE, NIGERIA
    (2024-09) Kester, C. T.; Daramola, John A.; Alao, F. O.; Chikwu, C. B.
    This study investigated the prevalence of Listeria spp. in 72 samples of smoked species of codfish (Gadus morhua), herring (Clupea harengus), catfish (Clarias gariepinus) and mackerel (Scomber scombrus) sampled from Sango (SA), Oju-ore (OO), Oja-Oba, Iyana-Iyesi (II), Iju (IJ) and Atan (AT) markets, all in Ota, Ogun State, Nigeria. Adopting Oxoid Listeria Precis method, Listeria spp. were isolated and characterized morphologically and biochemically. Of the 72 samples, 8 (11.11%) tested positive. Listeria ivanovii (1.38%), L. grayi (2.78%), L. monocytogenes (2.78%) and L. innocua (4.16%) were identified in all the fish samples except Clupea harengus. Antibiotic sensitivity tests revealed all the isolates resisted Imipenem, Cefuroxime, Amoxillin and Cefexine but susceptible to Levofloxacin: 34mm (L. grayi) to 39mm (L. ivanovii), Ciprofloxacin: 25mm (L. monocytogenes) to 36mm (L. grayi) and Ofloxacin: 20mm (L. ivanovii) to 29mm (L. innocua). Occurrence of these bacteria could indict the safety of the smoked fish products for consumption. The low percentage occurrences coupled with the high antibiotic susceptibility may, however, relieve the potential consumers of the menace of the associated health risks the consumption of such fish products could pose. The required control measures to prevent the occurrence of especially Listeria monocytogenes and other species in the processing and distribution chains of these smoked fish products should be prioritized.
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    Microbiological Quality of Gadus morhua Treated With Silver Nanoparticles Synthesized Using Launaea taraxacifolia Leaves.
    (2024) Kester, C. T.; Essien, Enobong R.; Akinwumi, Kazeem A.
    A number of shelf life-promoting strategies have been adopted for fish and fisheries products. The in vitro preservative effect of Ag-nanoparticles synthesized using Launaea taraxacifolia leaves on Atlantic cod fish (Gadus morhua) was investigated. The treated (TRD) fish samples were dipped in 25% silver nanoparticles (AgNPs) preparation for 30 minutes and analyzed at four hours intervals for 24 hours. Samples were cut into Head (H), Trunk (TR), and Tail (TL) parts and evaluated for total heterotrophic bacterial counts (THBC) and total yeast counts (TYC) all expressed in log CFU/g. Untreated (UTD) served as control. The concentrations of silver in both treated and untreated fish samples were determined. Data were analyzed using descriptive statistics and ANOVA at a0.05. The treated samples recorded lower THBC values than the untreated: head (6.18±0.27 vs 6.55±0.65); trunk (6.22±0.11 vs 6.61±0.41) and tail (6.40±0.34 vs 6.57±0.83). The treated samples had lower TYC values than the untreated: head (6.34±0.58 vs 7.44±0.38), trunk (6.59±0.66 vs 7.05±0.46) and tail (6.47±0.30 vs 6.81±0.95). Both the treated and the untreated samples were dominated by Enterococcus spp. (569 vs 957) and Micrococcus spp. (13 vs 18). Bacillus spp. (36) was isolated only in the untreated sample. The silver concentrations were highest in untreated and treated trunk samples respectively (1.12 and 2.13μg/g), followed by head samples (0.58 and 1.41μg/g) while the tail samples had the least (0.27 and 0.29 μg/g). The Ag-nanoparticles synthesized from Launaea taraxacifolia leaves exhibited both antibacterial and antifungal activities and could be useful in preserving fish and fishery products.
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    Smoked African Catfish (Clarias gariepinus) Sampled from Two Markets and Occurrence of Microbes
    (2020) Daramola, John A.; Kester, C. T.; Allo, O. O.
    The study was carried out to assess some microbiological qualities of smoked African catfish, Clarias gariepinus retailed in Sango and Ota markets in Ogun state, Nigeria. Six smoked fish retailers were randomly selected from the markets and 36 fish samples were collected. The samples of smoked catfish were assessed weekly for a period of six weeks for microbiological parameters such as Total plate count (TPC), Total coliforms count (TCC), Staphylococcus count and mould count. In this study, the microbial load of the smoked Clarias gariepinus samples retailed in the two study sites increased weekly during the period of storage. TPC increased from 4.75±0.014 log10 CFU/g for smoked samples from Ota market, retailer 1 (OMR1) in week 0 to 5.11 ±0.021 log10 CFU/g for samples from Ota market, retailer 3 (OMR3) in week 5. TCC ranged from 1.47±0.001 log10 CFU/g to 2.43±0.049 log10 CFU/g; Staphylococcus from 2.15±0.070 log10 (CFU/g) to 2.66±0.014 log10 (CFU/g) and 1.82 ±0.070 log10 CFU/g to 2.92±0.071 log10 CFU/g for mould counts. The smoked Clarias gariepinus from the markets could not keep well till the 6th week. Hence, it can be inferred that smoked catfish with moisture content of about 10% or less will have a shelf life of about 4 - 5 weeks under ambient storage conditions before the effect of spoilage microorganisms.