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  • 1
    Publication Date: 2021-05-19
    Description: The state of pollution in the Lagos lagoon was examined by a field survey of twenty-six sites (stations) in the dry and wet season in 1985. Some selected sites were further re-examined in the same period in 1986. The sediment trace metals and total hydrocarbons were analysed. The relationship between non residual and residual trace elements was examined. For both years of study, total trace metal levels (mg/kg) fell in the ranges: Cu,1.9 – 132.4, Cr, 2.9 – 167; 7.8 – 830. 6; Ph, 1.6 – 483.1 and Cd, 0.04 – 15.5. Total hydrocarbon concentrations in 1985 ranged from 0.25 to 2766.27 mg/g with high concentrations in muddy and sandy sediments. The results show marked variations and non – uniform distribution from one season to another. With few exceptions, higher values of trace metals and total hydrocarbons were obtained at sites located in the Western industrialized portions and lower values at sites far moved from sources of anthrogenic inputs. The results pointed to a need for an environmental pollution monitoring programme to ensure good water quality and detect subtle changes which could provide early warning (signals) of potential gross damage.
    Description: Published
    Keywords: Environmental pollution ; Coastal waters
    Repository Name: AquaDocs
    Type: Working Paper , Non-Refereed
    Format: 39274 bytes
    Format: application/pdf
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  • 2
    Publication Date: 2021-05-19
    Description: Bioassay tests were conducted with wastewater effluents from a textile mili and a detergent packing plant using the hermit crab. Clibinarius africanus. (Aurivillus) as experimental animal. LC50 values were evaluated using static testing procedures for 24, 48 and 96 hour. For the textile effluent, means of 79.0, 50.24 and 51.81 percentage effluent by volume were obtained in respect of crabs in the “medium” weight range (0.3 – 0.7grams) for the test periods. For the “detergent wash”, 95.16, 85.00 and 82.33 percentage effluent by volume represented means of values obtained for “small” size crabs (weight range 0.08–0.24 grams) and 96.0, and 81.50 percentage effluent by volume for ‘medium’ size crabs for 24, 48 and 96 hour respectively. Spearman’s Rank correlation coefficient showed no relationship between the variable weight and survival rate within the weight range used (p〉0.05 for the two-wastewater effluents. For the textile mill effluent, a two-way analysis of variance showed no significant differences between aerated and unaerated test solutions within a 96 hour period. Presumable safe concentrations have been compound using 0.1–0,05 and 0.1–0.01 as arbitrary application factors for the textile mill and “detergent wash” respectively. Some cost benefit recommendations are suggested based on observed plant processing activities
    Description: NIOMR
    Description: Published
    Keywords: Pollutants ; Water pollution ; Pollutants ; Water pollution
    Repository Name: AquaDocs
    Type: Report
    Format: 11
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  • 3
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    Nigerian Institute for Oceanography and Marine Research | Lagos, Nigeria
    Publication Date: 2021-05-19
    Description: The coastal waters in Nigeria are described in relation to the general morphology, vegetation and beach Type along the 850km coastal. The environmental sensitivity of the fragile Niger delta ecosystem is expressed by the numerous estuaries, rivers, creeks, lacustrine and inshore waters which support freshwater and brackish water mangrove swamps. Ocean resources exploited from the Niger delta and adjacent Continental platform include oil, gas and fishes. The general hydrograph and superfial circulation are described against the background of human activities in coastal settlements and developmental pressures for resource utilisation giving rise to water pollution. Micropollutants identified and measured so far include organic waste, trace heavy metals and chlorinated hydrocarbons. Although there is dearth of data for most coastal areas, there is a good basis for further monitoring by continuous standardized Measurements and observations to obtain reliable scientific data for management policies and regulatory framework for the protection of the coaster waters.
    Description: NIOMR, LAGOS
    Description: Published
    Keywords: Marine pollution
    Repository Name: AquaDocs
    Type: Report
    Format: 20pp.
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  • 4
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    Nigerian Institute for Oceanography and Marine Research | Lagos, Nigeria
    Publication Date: 2021-05-19
    Description: Continuous monitoring of Sea and Harbour (Lagoon) Surface temperature and salinity at two stations has been carried out from 1978 to 1981. This paper presents the findings for the period and relates it to the prevailing meteorological regimes. The pattern of sea surface temperature at Victoria beach in the study period shows a clearly defined mean maximum temperature of 29.34oC in April, and clearly defined mean minimum temperature of 25.63 in August. Depending on the year, there may be a less clearly defined mean maximum and minimum temperature in October/November and in January respectively. The pattern of surface temperature in the Harbour station is basically similar. The salinity cycle especially in the Harbour was found to be critically dependent on rainfall. Practical salinity values as low as zero was recorded in the Harbour during the rainy season while in the dry season, values greater than 30.0 were sometimes recorded. The effect of rainfall on sea surface salinity was expectedly less significant.
    Description: NIOMR, LAGOS
    Description: Published
    Keywords: Salinity ; Surface water ; Oceanography ; Harbours ; Surface temperature ; Surface salinity
    Repository Name: AquaDocs
    Type: Report , Non-Refereed
    Format: 2169641 bytes
    Format: application/pdf
    Format: 20pp.
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  • 5
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    Nigerian Institute for Oceanography and Marine Research | Lagos, Nigeria
    Publication Date: 2021-05-19
    Description: Guinea coast. It is a shallow expanse of water with restricted circulation in a micro-tidal environment. This aquatic resource of multiple usages receives inputs of domestic The Lagos Lagoon is the largest of the four lagoon systems of the Gulf of hydrocarbon cooling water from a thermal power station and emissions from automobile exhaust. Micro-pollutants examined in the water, sediment and biota have included organic waste, trace heavy metals and chlorinated hydrocarbons. Concentrations detected have identified â hot spotsâ and relatively unpolluted areas for the different contaminants in the lagoon. The results show marked variations and non-uniform distribution from one season to another. It has been difficult to differentiate pollution effects from natural variations in the general milieu of contaminated water. A monitoring program is recommended as a measure to restore the water quality following compliance with management policies and regulatory framework introduced for the protection of the coastal water.
    Description: NIOMR, Lagos
    Description: Published
    Keywords: Lagoons ; Marine pollution ; Lagoons
    Repository Name: AquaDocs
    Type: Report
    Format: 19pp.
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  • 6
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    In:  http://aquaticcommons.org/id/eprint/3719 | 424 | 2011-09-29 16:55:09 | 3719 | Fisheries Society of Nigeria
    Publication Date: 2021-06-29
    Description: Abstract The rapid growth of both formal and informal high density urban settlements around major water resources has led to increased pollution of streams, rivers, lakes and estuaries, due to contaminated runoff from these developments. The paper identified major contaminants to be : organic waste (sewage), industrial effluent, pesticides and litter. Pollutant loads vary depending on the hydrology of the urban area, local topography and soil conditions. In some instances, severe pollution of neighbouring and downstream water courses has been observed. The management of catchment land uses, riparian zones, in stream habitat, as well as in stream water flow patterns and quality are necessary in order to sustain the integrity and "health" of water resources, for fisheries and other developments. As such, attempts to ensure a certain level of water quality without attention to other aspects will not automatically ensure a "healthy" ecosystem even as fish habitat. Proper management leads to better water quality and conducive environment for increased fish production
    Keywords: Management ; Pollution ; Nigeria ; artisanal fishing ; fishery management ; resource management
    Repository Name: AquaDocs
    Type: conference_item
    Format: application/pdf
    Format: application/pdf
    Format: 30-35
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