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Recent Submissions
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.
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.
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.
Development of a model rotatory fish smoking kiln using agro-wastes as source of fuel
(FISON, 2009) Fasakin, E. A.; Daramola, John A.; Famurewa, J. A. V.
A model fish smoking kiln was designed and fabricated to use agro-wastes (sawdust, palm kernel shell
and rice bran) as alternative to conventionally used charcoal (control) as fuel energy source for
smoking fish. Clarias gariepinus was washed, brined and smoked in chunks or whole in the kiln. The
smoking kiln has an estimated capacity of 40kg of fish/batch with six fish trays and 36 fish hooks. Heat
transfer is by conduction and convection. The rotatory wheel and axle on which the fish drying trays
were anchored ensured even distribution of heat. The kiln has 69.4% energy efficiency and drying
period of 10 hours at an average temperature range of 60 - 120degreesC, depending on the type of
agro-waste used as source of fuel energy. The fuel conversion ratio, drying rates and calorific values
of the different agro-waste products were also determined. Calorific value of the four agro-wastes
ranged between 16.2MJ/Kg in palm kernel to 30MJ/Kg in charcoal. The drying rates of sawdust and
rice bran compare favourably with charcoal and they produced smoked fish similar in dryness and
quality with fish smoked with charcoal. Palm kernel had the least drying rate of smoked fish
(weight/hour) during the 10-hour smoking duration.
Spoilage Organisms in Smoked Atlantic Cod (Gadus morhua) from Different Sources
(Sumerianz, 2020) Daramola, John A.; Olumuyiwa, E. O.; Omo-Emevor, P. O.
This study was designed to establish the microbiological safety and suitability for human consumption of the cold-
smoked Atlantic cod, Gadus morhua retailed in Oju-Ore, Sango, Iyana-Iyesi and Oja-Oba markets in Ota, Ogun State,
Nigeria. The fish samples were randomly purchased from the four markets and analysed for Total Viable Count (TVC),
Total Coliform Count (TCC), Staphylococcal count and Fungi count using Nutrient agar, Plate count agar (PCA),
MacConkey agar, Mannitol salt agar (MSA) and Potato Dextrose Agar. Samples were stored in wire baskets and
examined for the presence of bacteria and fungi on day 1, 4, 8, 12 and 16. The highest mean values were TVC, 5.7 X
106 CFU/g; TCC, 6.4 X 104 CFU/g and Staphy. Count, 7.9 X 103 CFU/g in the smoked Cod from Oja- Oba market,
on day 16 of storage at ambient conditions. There were no fungal counts in all the smoked Gadus morhua samples
from the four markets on day 1. However, from the 4th day, there were traces of fungi from 0.4 X 102 CFU/g in
samples from Oju-Ore to 4.6 X 102 CFU/g on day 12 in samples from Oja-Oba market. By the 16th day, moulds have
completely covered the smoked fish and it was too numerous to count (TNC). Also, through biochemical
characterization, some bacterial isolates from the smoked fish were identified. Generally, smoked Cod from Oju-Ore
had the best quality and least mean values of the microbial parameters, followed by that of Sango, Iyana-Iyesi and the
highest values were the smoked fish from Oja-Oba markets. It was, however, recommended that the application of the
Hazard Analysis Critical Control Point (HACCP) principles be introduced to the local fish processors, putting their
literacy level into consideration for them to be able to understand and imbibe the concept of the practice.