Davies Ibienebo Chris

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• B. Fishers MSc PhD (Aquatic Eco-toxicology) Research Fellow of INTI
• Lecturer at University of Port Harcourt

Anthropogenic activities along coastal areas have contributed to the unwarranted discharge of toxic metals into mangrove swamps, posing risks to marine deposits and ecological environments. In this research, we studied the Isaka–Bundu tidal swamp area in the Niger Delta, which is an impacted mangrove creek located along the Bonny river, exposed to...

The research aimed to examine the risk to human health from heavy metal (Fe, Pb, Zn, Cd, Cu, and As) accumulation in the tissues of swimming crabs collected from three stations along the Isaka-Bundu creek between January and June 2021. Atomic absorption spectroscopy (AAS) Sigma-Aldrich certified reference materials (CRMs) was used for analysis and...

A comparative study on the water quality of the interstitial water of two creeks in Rivers State was conducted. Temperature, pH, Conductivity, Dissolved oxygen, biochemical oxygen demand, Salinity, and Total dissolved solid were checked with an in-situ hand-held multi-meter (The EZODO Multi-meter). Dissolved oxygen (DO) was measured with a Milwauke...

The objective of this research was to assess the anthropogenic impact on plankton and macrobenthic fauna composition, abundance, distribution, and diversity of four communities in Buguma creek. The Phytoplankton, zooplankton, and benthic fauna samples were collected quantitatively monthly from each of the four sampling stations between January and...

Heavy metal contamination in water and sediment is a serious concern in nations that depend heavily on natural resources such as Nigeria. In most coastal communities around oil mining areas in Nigeria, drinking water quality, staple food, and livelihoods are primarily dependent on ecological systems and marine resources (e.g., fish). Thus, humans a...

This study investigates the heavy metal concentrations in water and sediment samples from three stations in coastal marine wetlands in Rivers State, Nigeria: Sangama, Degema, and Tema. Samples were collected monthly from October 2021 to April 2022. Igeo, metal pollution load index (MPLI), ecological risk assessment, ecological risk factor (Er), and...

The aim of this study is to provide baseline data on the investigation of concentrations of copper (Cu), lead (Pb), iron (Fe), manganese (Mn), and zinc (Zn) in various tissues (gills, intestine, liver, and fillet) of Parachanna obscura in Oguta Lake, and to assess physicochemical properties of Oguta lake to determine level of pollution and contamin...

The study examined the distribution of physicochemical parameters and toxic metals in the Niger Delta Coast, Nigeria. The shellfish (T. fuscatus), water, sediments, and physicochemical data were collected from three sampling stations over a six-month period. The findings revealed considerable variability in levels of heavy metals and physicochemica...

This study was carried out to determine the amounts of heavy metals in Silver Catfish and water samples collected from the Ogbogoro section of the new Calabar River in Nigeria. Measure key water quality parameters, such as pH, temperature, salinity, conductivity, total suspended solids, and Total dissolved solids. Dissolved oxygen levels were asses...

The levels of heavy metals in the environment have seriously increased during the last few decades due to human activities. Aquatic environment is a major recipient of heavy metal pollution. Heavy metal content of Ahi River was studied between May and October 2023 in three stations, compared with national standards to determine the water’s suitabil...

The rise in illegal crude oil theft and refining in the southern Niger Delta region of Nigeria, especially in Rivers State, has led to significant environmental damage to aquatic ecosystems. A study was carried out to assess the impact of crude oil bunkering on aquatic environments and fish samples from Oproama, Sama-Naguakiri, and Abalama over six...

This study aimed to investigate the spatial contamination, pollution load, and bioaccumulation of trace metals in the mangrove swamp of the Niger Delta Estuary, focusing on water, sediment, Periwinkles (P. fusca), and Whelks (T. fuscatus). Samples were collected from May and August 2023 and analyzed for heavy metals (Fe, Zn, Pb, Cd, Cu, and As) acr...

This comprehensive study delves into the Environmental Impact Assessment (EIA) and trace elements present in surface water, sediments, and fish within the riparian communities of the Niger Delta region, Nigeria. The study encompasses three key communities: Tema, Sangama, and Degema. Each community presents unique challenges, from illegal waste proc...

This study assessed trace metal enrichment and contamination levels in Tema, Sangama, and Degema communities in Rivers State, Nigeria. Samples were collected monthly from October 2021 to April 2022. Trace metals such as Pb, Cu, Fe, Cd, Zn, and As were analysed using an Atomic Absorption Spectrophotometer (AAS). The contamination factor, degree of c...

The study focused on the evaluation of the physiochemical and heavy metal concentration in shrimp (P. monodon), sediments and surface water of Ikpukulu, Kalio, and Ogoloma swamps in Okrika Local Government Area, Rivers State, Nigeria. The following parameters were examined: temperature, potential hydrogen, electrical conductivity, salinity, dissolv...

Introduction: The Niger Delta in Nigeria is subject to anthropogenic influences, impacting the quality of its water bodies, including the Sombrero River. This study aims to investigate the concentrations of metals and metalloids in Gobius niger from the Sombrero River, as these contaminants can pose risks to human health through seafood consumption...

Water quality and biodiversity impacts are influenced by the physical and chemical properties of water. An annual study was carried out in Luubara Creek, located in the Khana Local Government Area of Rivers State, Nigeria, spanning from April 2022 to March 2023. Throughout the study period, the water temperature in Luubara Creek fluctuated between...

Triethylene glycol (TEG) removes equilibrium water from natural gas but may spill during equipment maintenance and other poor safety practices. Studies on the toxicity of rich TEG in aquatic habitats are scarce. In this study, the toxicity of rich TEG on freshwater juvenile African catfish (Clarias gariepinus) test organism was conducted. The exper...

In this study, the content of essential minerals, copper (Cu), iron (Fe), manganese (Mn), calcium (Ca), and sodium (Na) in the edible parts of Tympano Tonus Fuscatus, Thais coronata, Crassostrea gasar, Cardisoma guanhumi, and Callinectes amnicola from Opuro-ama creeks was analysed using an atomic absorption spectrophotometer, and descriptive statis...

The study was conducted for three months (May to July 2020), focusing on the physicochemical parameters and zooplankton composition in the Ogbogoro region of the New Calabar River in Nigeria. This investigation was carried out at three distinct monitoring stations. The physicochemical parameters were determined using standard ecological analytic pr...

Anthropogenic activities have led to the escalation of toxic metals, polluting rivers and accumulating in water, sediments, and fish. This damages aquatic ecosystems and has lasting effects on humans and aquatic life. The study aimed to determine the accumulation of heavy metals (Pb, Cr, Cu, Fe, Ni, Cd, and Zn) in Redbelly tilapia (Coptodon zillii)...

This study examined the histological aberrations in the gill and liver tissues and behavioural changes of Tilapia guineensis fingerlings exposed to lethal concentrations of used Oilfield-based emulsifiers for 96 h. Various concentrations of the surfactants were tested, ranging from 0.0 to 15.0 ml/L. The behaviour of the fish was observed throughout...

A study was conducted to determine the physicochemical parameters of surface water and heavy metal concentrations in the mudskipper (Periophthalmus papilio) fish, sediments, and water collected from the Ikpukulu, Kalio, and Ogoloma swamps of Okrika Local Government Area, Rivers State, Nigeria and analysed using standard methods. All samples were co...

This study investigates the concentration and purity of DNA extracted from Clarias gariepinus after exposure to lethal concentrations (250 ml/l, 200 ml/l, 150 ml/l, 100 ml/l, 50 ml/l, 25 ml/l, and 0.0 ml/l for the control) of Xylene: Diesel (X:D) and Oilfield-Based Emulsifiers (O-BE) over 96 hours using static bioassays and sub-lethal concentration...

Marine biotas are used to assess potential adverse human health risks associated with consuming protein-rich aquatic organisms. Heavy metal content of Mangrove oysters (Crassostrea gasar) was evaluated between January and June 2022 in 3 stations. Six heavy metals (copper, cadmium, zinc, lead, arsenic and iron) were determined using standard methods...

The aim is to assess the variation in the karyotype number of chromosomes in C. gariepinus and the genetic consequences of exposure to mixed industrial chemicals in the African Catfish, providing valuable information for environmental management, conservation, and potential human health considerations. From the acclimation tanks, ten healthy and ac...

Analysis of the impact of abattoir effluents on the physicochemical parameters of the New Calabar River was carried out from February 2020 to July 2020. All parameters were determined using APHA 2340C standards. From the results, the pH ranged from 6.92 to 7.20, while the temperature was from 18.69 to 29.10 ºC. Salinity ranged from 3.83 to 6.73 ppt...

This study investigates the health risks associated with trace elements in Gorean snapper (Lutjanus goreensis) from Buguma Creek, Southern Nigeria. Fish samples were collected monthly from May to August 2023, and muscle tissues were analyzed for potential health risks posed by elevated levels of hazardous metals. The concentrations of various heavy...

Abstract Sediments can act as pollutant sinks and a source of pollution in aquatic environments. We used standard techniques and evaluation tools to find out how much heavy metal was in the surface sediments of the Isaka-Bundu tidal swamp in the Niger Delta. The study was carried out at three stations between January and June 2022. There were eight...

This study investigates the health risks associated with trace elements in Bobo Croaker (Pseudotolithus elongatus) from Buguma Creek, Southern Nigeria. Fish samples were conducted monthly from May to August 2023, and muscle tissues were analyzed for potential health risks posed by elevated levels of hazardous metals. Heavy metal concentrations of A...

The heavy metal concentrations of water and shrimp (Penaeus monodon) from Isaka Bundu swamp, Niger Delta were evaluated between January and June 2022. The non-carcinogenic health risk assessment was used to assess the water's suitability for recreation and the shrimps for consumption. Five heavy metals (Pb, Cu, Cd, Ni, and Zn) were assessed in both...

This study investigated the temporal variations of water quality parameters and ecotoxic trace metal contamination in the Opuroama River over a year, with a focus on providing baseline data for regulating water and fisheries resources in the area. Metal concentrations in sediment, water, and four aquatic organisms were analyzed for cadmium (Cd), ch...

Heavy metal contamination in water and sediment is a serious concern, particularly in natural resource-dependent countries. In most coastal communities in these countries, drinking water quality, stable food, and livelihoods are primarily dependent on ecological systems and marine resources (e.g., sediments and fish), thus humans and other receptor...

This research project was carried out to compare study the impact of anthropogenic activities in the aquatic ecosystem of surface water resources and thereby evaluate the impacts amongst the different stations along the Borokiri section of the Bonny River estuary, located in Port Harcourt-City Local Government Area, Rivers State. Nigeria. Several a...

This study was carried out to determine some physico-chemical parameters of Elelenwo River and the concentration of some heavy metals and hydrocarbons between the months of October 2021 and March 2022. The pH, temperature, salinity, turbidity, electrical conductivity (EC), total dissolved solids (TDS) and dissolved oxygen (DO) concentrations ranged...

Sediments can act as pollutant sink as well as source of secondary contamination in aquatic ecosystems. The pollution characteristics of eight heavy metals in the sediments of Ikwu River, Umuahia were investigated using eight assessment indices. The study was carried out between January and June 2022 in three stations. Results showed that cadmium e...

The behavioural and histological effects of sublethal concentrations (0.0 ml/L, 12.8 ml/L, 25.59 ml/L, 38.39 ml/L, 51.19 ml/L, and 63.99 ml/L) of Xylene were evaluated in African Catfish (Clarias gariepinus) after 28 days of exposure. Physico-chemical parameters such as temperature, conductivity, hydrogen ion concentration (pH), total hardness, tot...

A comparative study between fingerlings reared in a cage, concrete pond, and earthen pond systems was conducted between March and August 2019. The fish net cage was constructed with ½ netting materials (210 D/9), nylon twine (210 D/9 and 210 D/8), and ropes (10mm PE and 4mm PE, as a house in which the fish fingerlings were stocked. The stocked fish...

This study aimed to investigate the composition, abundance, distribution, and diversity of the phytoplankton community of the Isaka-Bundu waterway in Rivers state, which is a polluted tidal mangrove wetland. Phytoplankton was collected bimonthly from July to December 2021 at high tide from four stations according to APHA methods. The species divers...

The study was aimed at examining the impact of untreated discharges from artisanal refineries (illegal bunkering), loading and other related activities on the composition, abundance, distribution, and diversity of zooplankton and macrobenthic fauna from four creek channels of the Isaka-Bundu waterfront in Rivers State, a polluted tidal mangrove wet...

The toxicity of the combination of xylene and diesel at a 50:50 ratio on the African catfish (Clarias gariepinus) was investigated using a static bioassay for 96hrs. No significant difference (P>0.05) was observed in the Physicochemical parameters of the experimental water after exposure for 24 hours among the different concentration gradients and...

Crude oil is the major source of revenue in Nigeria with the vast majority of exploration from the Niger Delta. Illegal refining of stolen oil is a major cause of oil spills and comes with steep environmental, economic, and social costs in the region. Oil theft, artisanal refineries, and ecosystem pollution are simultaneously linked. Therefore, the...

Crude oil is the major source of revenue in Nigeria with the vast majority of exploration from the Niger Delta. Illegal refining of stolen oil is a major cause of oil spills and comes with steep environmental, economic, and social costs in the region. Oil theft, artisanal refineries, and ecosystem pollution are simultaneously linked. Therefore, the...

A study was conducted on physicochemical parameters water from Ilo-abuchi, creek Niger Delta, Nigeria. The study aimed at evaluating the impact of sawmills and other associated wastes on water quality of the creek. The physicochemical parameters investigated were from February to July 2020 and the samples were analysed for pH, Temperature, Salinity...

The study was carried out to examine the haematological and behavioral response of African catfish (Clarias gariepinus) exposed to sub-lethal concentrations (0.0 ml/L (as control), 12.8 ml/ L, 25.59 ml/L, 38.39 ml/L, 51.19 ml/L, and 63.99 ml/L) of xylene using a renewable assay for 28 days. A total of one hundred and twenty (120) healthy Clarias ga...

The study was conducted to determine the heavy metals concentration in selected shell fishes (U. tangeri, C. amnicola, T. fuscatus, P. monodon), sediment and water. The samples were collected from a fishing port along the Opuro-ama Creek in Rivers State of Nigeria. analysis for Manganese (Mn), Iron (Fe), Cobalt (Co) and Zinc (Zn) were done using At...

This study was conducted to examine the impacts of abattoir and associated activities wastes on the water quality of Eagle Island creek; mainly on its physicochemical parameters. Specifically, the sampling stations covered the point where the Abattoir is located, and both up and down stream of the Abattoir location. The physicochemical parameters w...

The aim of this study was to evaluate the levels of heavy metals in surface water, sediment and selected fish samples in New Calabar River. Samples for analyses were collected for six months across three stations between 08:00 and 12:00 hrs on each sampling day. Physicochemical parameters and metals in water, sediments and tissues of fishes were an...

The aim of this study was to evaluate the levels of heavy metals in surface water, sediment and selected fish samples in New Calabar River. Samples for analyses were collected for six months across three stations between 08:00 and 12:00 hrs on each sampling day. Physicochemical parameters and metals in water, sediments and tissues of fishes were an...

The aim of this study was to evaluate the spatial variation of the physicochemical parameters and heavy metals in surface water, sediment and swimming crab (calinectes amnicola) harvested from the water front of some fishing communities in river state, Nigeria. The physicochemical parameters were analylised using the in-situ multi-meter) while the...

Concentrations of Cu, Fe, and Zn in sediments, water and tissues of mud skippers (Periophthalmus papillio) from Isaka and Bundu mangrove swamp in the Upper reach of Bonny Estuary, Niger Delta, Nigeria were investigated. Water, sediment and Periophthalmus papillio samples were collected from three stations every three weeks for three months. The hea...

Gas hydrates are known impediments to flow. Mitigation of gas hydrates in deep offshore with accessibility issues is by chemical injection. This paper considers the effect of 2-Di(methylamino) ethylmethacrylate (2-DMAEM) a kinetic gas hydrate inhibitor and a Local Inhibitor (LI) on Clarias gariepinus, a marine organism. The assessment was done usin...

The objectives of the study were to determine distribution of heavy metal contamination in water, sediments and biota (Callinectes amniciola) of the upper reaches of the Bonny Estuary and to determine the impact on physicochemical characteristics of the water body. Sampled was from January to June 2020. The physicochemical parameters of the water v...

The study was carried out to assess the level of selected metals and physico-chemical parameters of a polluted creek along the Tin Can Island in Lagos. Metals such as Cu, Fe, Zn, Pb, Cd, Mn, and Cr were analysed using Atomic Absorption Spectrophotometer. Correlations analysis was conducted to determine the spatial distribution of the metals. From t...

This study assessed the physico-chemical characteristics, concentration of heavy metals and nutrients composition of the surface water of Badagry and Tincan Island creeks adjoining the Lagos Lagoon. Sanplind was done once in a month between May and September 2019. The pH, Temperature, Salinity, Conductivity, Total Dissolved Solids, Total Suspended...

Plankton samples were collected at the Tincan Island creek once a month for five months (May-September 2018). Some Physico-chemical parameter were analysed. The pH value varied between low acidic and low alkaline with a mean value of 7.11±0.34. The Water temperature fluctuated slightly at all stations with a mean value of 28.60±1.55°C. Conductivity...

This study assessed the physicochemical quality of the creek and its phytoplankton diversity; samples were collected and analyzed for five months (May-September, 2018). The pH value recorded was within 6.95-7.53 but the total hardness recorded are above the WHO standard as a result of the presence of calcium, magnesium, sulphate arising from TSS, T...

Seasonal and Spatial Variations The seasonal and spatial variations in the fish assemblage of Cross River System, Oron observed during the study period supports the report of Jackson and Harvey (1997) that various lake fish communities exhibit non-random patterns in composition over time and space. Higher number of fish species and individuals were...

Mangroves are vulnerable to varying magnitudes of degrading impact by human activities. Despite the many benefits of mangrove ecosystems, mangroves in the Niger Delta region are often cleared for electric powerline and oil pipeline rights-of-way, recreation, road construction, housing and farming. The study assessed the impacts of mangrove clearanc...

This study investigates level of pollution in the Ajegunle Creek. Water samples were collected and analyzed for five months. This physicochemical characteristics, cation content, nutrients and heavy metal levels varied across the three sampled stations. The mean physicochemical parameters are Temperature (23-29.5ºC), TSS (9-43mg/l), TDS (386.3-1570...

The phytoplankton diversity, pigment, abundance and distribution in relation to physico-chemical parameters were studied from four stations for a period of five months (May – September 2018) and were analysed using standard procedures. Rainfall was highest (329.5 mm) in September and lowest (142.7 mm) in July. The total suspended solid (TSS) had a...

This study investigated heavy metals concentration in Penaeus monodon, surface water and sediment for six months in Iwofe creek, in Niger Delta, Nigeria. Samples were collected from three stations and were analyzed for lead (Pb), chromium (Cr), cobalt (Co), Zinc (Zn), copper (Cu) and nickel (Ni) use of atomic absorption spectrophotometer. The resul...

Zooplankton diversity, abundance and distribution in relation to physico-chemical parameters of the Isaka Creek water were studied from three stations for a period of six months (January to June 2019) and were analyzed using standard procedures. Identification and enumeration were carried out using a binocular compound microscope with model XSZ-701...

Physicochemical parameters of Okpoka Creek in Rivers State, Nigeria were studied from February to July 2020 for a period of 6 months. The effects of the abattoir wastes on the water quality were determined on both monthly and location-basis. Water samples were analyzed using standard methods. The thirteen parameters analyzed were pH, temperature, d...

A preliminary study was carried out to determine the fishery of the Ajoki Creek in the Ikpoba-Okha Local Government. Area of Edo State. Fishery activities on the river were ascertained by administration of questionnaires to a randomly selected group of persons. The data were analyzed using descriptive statistics. Results revealed fishing as the pre...

The fishery of Saint Bartholomew River in Rivers State was studied, in order to provide information for sustainable management and development of the River's fishery. A four-week survey in six randomly selected sample stations along the River assessed Fishers' demographic and non-demographic information, using a questionnaire. Results revealed fish...

Acute toxicity of xylene on an African catfish (Clarias gariepinus) was carried out. A total of 10 Catfish C. gariepinus juveniles with mean length 15.20±2.3cm, and mean weight of 10.23±2.6g were obtained from the University of Port Harcourt Demonstration Farm. The test was determined for 96hour median lethal concentration using concentrations of 2...

Heavy metals concentrations (Lead, Nickel and Cadmium) in different media of the Upper Reaches of the Bonny River, Niger Delta, Nigeria, were sampled and analyzed. Samples of surface water, sediment and swimming crab (Callinectes amnicola) were collected from three different stations from January to June. Heavy metals in the different media were an...

A total of 210 African catfish (Clariasgariepinus) juveniles with a mean weight of 10.23±2.6g and a mean length of 15.20±2.3cm, and were obtained from the University of Port Harcourt Demonstration Farm. A lethal effect of the mixture of xylene and diesel (at 50:50 ratio) was carried out to determine its effect on the African Catfish (C. gariepinus)...

The anthropogenic impact on coastal waters has increased due to activities and increasing population around the coastal environments. The physico-chemistry parameters of the Tincan Island creek were investigated for five (5) months (May to September, 2018) at three stations. The parameters were determined using standard ecological analytic procedur...

The study was carried out to assess the concentration of cadmium, zinc, lead, and mercury in Mugil cephalus the New Calabar River collected from three different stations. The concentration of Lead in water was 0.18±0.03, 0.19±0.02 and 0.30±0.02 mg/l for stations 1, 2 and 3, respectively. However, the mean value concentrations of cadmium, zinc, and...

This study was conducted to determine the concentration of lead (Pb) and Zinc (Zn) in a fish species (Sarotherodon melanotheron), sediment and water from three different stations along Choba axis of New Calabar River, within the Niger Delta, Nigeria. Station one was located upstream of the river, very close to slaughter; Station two was located mid...

This study was conducted in order to determine the proximate composition of selected shellfishes from the Buguma creek in Rivers State, Nigeria. The edible parts of shell fishes (Tympanotonus fuscatus, Thais coronata, Callinectes amnicola, Cardisoma guanhumi, and Crassostrea gasar) were analysed for their proximate composition (ash, fat, moisture a...

ABSTRACT: The study was conducted to determine the mineral contents of some selected shellfishes from Okpoka Creek in River State. Copper, iron, manganese, calcium and sodium were quantified using Atomic Absorption Spectrophotometric method and the concentration of the minerals varied between the different species of shellfishes. High amount of cal...

A multiple choice test was used to determine the rate of infestation of D. maculatus on two cured fish species of commercial importance. All the treatments had three replicates and were arranged in randomized complete block design. The infested and non-infested dried fish were subjected to a taste panel of four to evaluate the texture and taste qua...

Greater proportion of the much needed rich animal protein and other essential nutrients for man's prolonged well-being, globally, is derived from fish. Three considered factors in production model for such aquaculture project include: Technology, suitable site for location of envisaged set up and market. While concerned and interested stakeholders...