Pertinent and Traditional Approaches Towards Fishery
The relationship among the morphology, population of crustaceans and water quality of the coastal... more The relationship among the morphology, population of crustaceans and water quality of the coastal marine waters of Ondo State, Nigeria, was assessed in order to accentuate the sustainability of biodiversity in the coasts. Standard methods were employed to identify and examine the effect of the environment on the crustaceans. The DO (7.58 mg/l), temperature (29.53°C), pH (6.69), turbidity (44.03NTU), salinity (16.48‰), hardness (85.88 mg/l), biochemical oxygen demand (21.22 mg/l) and conductivity (41.55 μS cm−1). The population structure of decapod crustaceans follows the order Nematopalaemon hastatus > Farfantepenaeus notialis > Holthuispenaeopsis atlantica > Macrobrachium macrobrachion > Sanquerus validus > Ocypode africana > Callinectes marginatus. The sampled organisms (F. notialis, M. macrobrachion, N. hastatus and Holthuispenaeopsis atlantica) had mean total length (cm) (9.41 ± 1.62, 7.14 ± 0.77, 6.69 ± 0.81 and 11.78 ± 0.60) and body weight (g) of (3.21 ± 1.6...
The concentration of nine heavy metals in Oreochromis niloticus and Ipomoea aquatica inhabiting A... more The concentration of nine heavy metals in Oreochromis niloticus and Ipomoea aquatica inhabiting Agodi reservoir, Oyo State, Nigeria were investigated for twelve months. The concentrations of the metals were carried out using PG990 Atomic Absorption Spectrophotometer. The Ecological Risk Quotient (ERQ) was calculated using standard methods while the tolerability was determined with Box Plot analysis. The metal bioaccumulation in O. niloticus and I. aquatica followed the order Mn>Fe>Zn>Cu>Co>Pb>Cd>Cr>Ni and Fe>Zn>Mn>Cu>Pb>Cd>Co>Cr>Ni respectively. The results revealed O. niloticus to bioaccumulate the metals more than I. aquatica. Most of the examined metals were higher than the safety limit for the metals concentration in O. niloticus and I. aquatica. Also, I. aquatica had higher tolerability for heavy metals than O. niloticus. In O. niloticus, metal concentration, as well as ERQ, was higher in the wet season while no particular order w...
Edible aquatic brackish water shellfish (Nematopalaemon hastatus) obtained from the coastal water... more Edible aquatic brackish water shellfish (Nematopalaemon hastatus) obtained from the coastal waters of Ondo state, Nigeria was analyzed between 2017 and 2018 for the concentration of Total Petroleum Hydrocarbons (TPHs). TPHs level in the sampled species was measured using gas chromatography-flame ionization detector (GC/FID). Possible human health risks associated with the ingestion of the sampled species were determined by estimated dietary intake (EDI) and health risk index (HRI). The TPH level observed in the biota species (Nematopalaemon hastatus) varied across the period of study. The highest concentration was recorded in February (3401.55 mg/kg) while the lowest was recorded in April (1995.99 mg/kg). The TPH values of the analyzed fish species exceeded the threshold value of 50 mg/kg for fish. Petroleum aliphatic hydrocarbons attained higher concentration in n-Hentriacontane, n-Tridecane, n-Nonane, n-Tetradecane, n-Triacontane, n-Tetracosane and n-Octacosane with mean concentration values of (2242.02, 189.60, 40.90, 40.72, 25.79, 15.40 and 8.73 mg/kg) respectively. The EDI and HRI had their peak dose and index value (1.19 and 2.37) in February and lowest dose an index value (0.70 and 1.39) in April respectively. In addition, the HRI exceeded the safety limit of one (1). The findings from this study reveal a significant carcinogenic health risk connected with the consumption of the sea species. Thus, the species is therefore considered unfit and unsafe for consumption.
Asian Journal of Fisheries and Aquatic Research, 2019
Coastal waters of Ondo State, Nigeria have diverse assemblage of fish, yet there is dearth of inf... more Coastal waters of Ondo State, Nigeria have diverse assemblage of fish, yet there is dearth of information on its plankton composition. This study investigates plankton components in relation to physicochemical characteristics of the coastal waters bordering Olotu, Ayetoro and Bijimi in providing baseline information that can be used for planning and implementation of policies for monitoring, impacts assessment and conservation. Surface water samples were collected on monthly basis from March to June 2015 to analyze physicochemical parameters while plankton net of 55μm mesh size was used for collection of plankton using standard methods prescribed by APHA. The light and dark bottle method was used to determine primary productivity. Shannon-wiener, Margalef and Equitability Indices were used for diversity. Values of the physicochemical parameters observed ranged as follows: temperature, 27.47±2.06-29.27±0.31ºC; turbidity, 43.43±0.91-65.33±2.52NTU; pH, 5.54±0.31-6.12±0.30; BOD, 2.20±0....
Total Petroleum Hydrocarbons (TPHs) are of environmental interest because they are toxic to the a... more Total Petroleum Hydrocarbons (TPHs) are of environmental interest because they are toxic to the aquatic fauna and flora. Hence, this study was carried out to provide baseline information on the level of TPHs in the coastal waters and species of Nigeria using standard methods. The TPH level in the water (4.07 mg/l) was low when compared with the target limit of 10 mg/l for the Niger Delta water. The independentsamples Kolmogorov-Smirnov Test of TPH in water and Nematopalaemon hastatus revealed a significant relationship (p < 0.05). TPH level in the species (N. hastatus) was 2585.62 mg/kg indicating long-term bioaccumulation. The values obtained was higher than the target limit of 50 mg/kg but within the intervention limit. The bioaccumulation factor (BAF) showed significant variation across the months, although below the standard limit (1000 mg/kg). The aliphatics hydrocarbon also posed a high ecological hazard to the biota species (Nematopalaemon hastatus) as the ecological hazard assessment (EHA) was far above one (1). Hence, to improve fish yield, as well as diversity, effective pollution control and adequate regulation of all activities contributing to the levels of petroleum hydrocarbon in the coastal region, are strongly recommended.
Pertinent and Traditional Approaches Towards Fishery
The relationship among the morphology, population of crustaceans and water quality of the coastal... more The relationship among the morphology, population of crustaceans and water quality of the coastal marine waters of Ondo State, Nigeria, was assessed in order to accentuate the sustainability of biodiversity in the coasts. Standard methods were employed to identify and examine the effect of the environment on the crustaceans. The DO (7.58 mg/l), temperature (29.53°C), pH (6.69), turbidity (44.03NTU), salinity (16.48‰), hardness (85.88 mg/l), biochemical oxygen demand (21.22 mg/l) and conductivity (41.55 μS cm−1). The population structure of decapod crustaceans follows the order Nematopalaemon hastatus > Farfantepenaeus notialis > Holthuispenaeopsis atlantica > Macrobrachium macrobrachion > Sanquerus validus > Ocypode africana > Callinectes marginatus. The sampled organisms (F. notialis, M. macrobrachion, N. hastatus and Holthuispenaeopsis atlantica) had mean total length (cm) (9.41 ± 1.62, 7.14 ± 0.77, 6.69 ± 0.81 and 11.78 ± 0.60) and body weight (g) of (3.21 ± 1.6...
The concentration of nine heavy metals in Oreochromis niloticus and Ipomoea aquatica inhabiting A... more The concentration of nine heavy metals in Oreochromis niloticus and Ipomoea aquatica inhabiting Agodi reservoir, Oyo State, Nigeria were investigated for twelve months. The concentrations of the metals were carried out using PG990 Atomic Absorption Spectrophotometer. The Ecological Risk Quotient (ERQ) was calculated using standard methods while the tolerability was determined with Box Plot analysis. The metal bioaccumulation in O. niloticus and I. aquatica followed the order Mn>Fe>Zn>Cu>Co>Pb>Cd>Cr>Ni and Fe>Zn>Mn>Cu>Pb>Cd>Co>Cr>Ni respectively. The results revealed O. niloticus to bioaccumulate the metals more than I. aquatica. Most of the examined metals were higher than the safety limit for the metals concentration in O. niloticus and I. aquatica. Also, I. aquatica had higher tolerability for heavy metals than O. niloticus. In O. niloticus, metal concentration, as well as ERQ, was higher in the wet season while no particular order w...
Edible aquatic brackish water shellfish (Nematopalaemon hastatus) obtained from the coastal water... more Edible aquatic brackish water shellfish (Nematopalaemon hastatus) obtained from the coastal waters of Ondo state, Nigeria was analyzed between 2017 and 2018 for the concentration of Total Petroleum Hydrocarbons (TPHs). TPHs level in the sampled species was measured using gas chromatography-flame ionization detector (GC/FID). Possible human health risks associated with the ingestion of the sampled species were determined by estimated dietary intake (EDI) and health risk index (HRI). The TPH level observed in the biota species (Nematopalaemon hastatus) varied across the period of study. The highest concentration was recorded in February (3401.55 mg/kg) while the lowest was recorded in April (1995.99 mg/kg). The TPH values of the analyzed fish species exceeded the threshold value of 50 mg/kg for fish. Petroleum aliphatic hydrocarbons attained higher concentration in n-Hentriacontane, n-Tridecane, n-Nonane, n-Tetradecane, n-Triacontane, n-Tetracosane and n-Octacosane with mean concentration values of (2242.02, 189.60, 40.90, 40.72, 25.79, 15.40 and 8.73 mg/kg) respectively. The EDI and HRI had their peak dose and index value (1.19 and 2.37) in February and lowest dose an index value (0.70 and 1.39) in April respectively. In addition, the HRI exceeded the safety limit of one (1). The findings from this study reveal a significant carcinogenic health risk connected with the consumption of the sea species. Thus, the species is therefore considered unfit and unsafe for consumption.
Asian Journal of Fisheries and Aquatic Research, 2019
Coastal waters of Ondo State, Nigeria have diverse assemblage of fish, yet there is dearth of inf... more Coastal waters of Ondo State, Nigeria have diverse assemblage of fish, yet there is dearth of information on its plankton composition. This study investigates plankton components in relation to physicochemical characteristics of the coastal waters bordering Olotu, Ayetoro and Bijimi in providing baseline information that can be used for planning and implementation of policies for monitoring, impacts assessment and conservation. Surface water samples were collected on monthly basis from March to June 2015 to analyze physicochemical parameters while plankton net of 55μm mesh size was used for collection of plankton using standard methods prescribed by APHA. The light and dark bottle method was used to determine primary productivity. Shannon-wiener, Margalef and Equitability Indices were used for diversity. Values of the physicochemical parameters observed ranged as follows: temperature, 27.47±2.06-29.27±0.31ºC; turbidity, 43.43±0.91-65.33±2.52NTU; pH, 5.54±0.31-6.12±0.30; BOD, 2.20±0....
Total Petroleum Hydrocarbons (TPHs) are of environmental interest because they are toxic to the a... more Total Petroleum Hydrocarbons (TPHs) are of environmental interest because they are toxic to the aquatic fauna and flora. Hence, this study was carried out to provide baseline information on the level of TPHs in the coastal waters and species of Nigeria using standard methods. The TPH level in the water (4.07 mg/l) was low when compared with the target limit of 10 mg/l for the Niger Delta water. The independentsamples Kolmogorov-Smirnov Test of TPH in water and Nematopalaemon hastatus revealed a significant relationship (p < 0.05). TPH level in the species (N. hastatus) was 2585.62 mg/kg indicating long-term bioaccumulation. The values obtained was higher than the target limit of 50 mg/kg but within the intervention limit. The bioaccumulation factor (BAF) showed significant variation across the months, although below the standard limit (1000 mg/kg). The aliphatics hydrocarbon also posed a high ecological hazard to the biota species (Nematopalaemon hastatus) as the ecological hazard assessment (EHA) was far above one (1). Hence, to improve fish yield, as well as diversity, effective pollution control and adequate regulation of all activities contributing to the levels of petroleum hydrocarbon in the coastal region, are strongly recommended.
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