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  • 1
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    Trends in nitrate-nitrogen, nitrite-nitrogen and phosphorus concentration in Ebonyi river, Nigeria (2021)
    In:  managingeditor.olawale71@gmail.com | http://aquaticcommons.org/id/eprint/7313 | 5610 | 2013-02-14 11:02:22 | 7313 | Wilolud Journals
    Details
    Publication Date: 2021-07-02
    Description: A baseline study of the limnological integrity of Ebonyi River, a tropical lotic system in south-eastern Nigeria was conducted between September 2006 and February 2008 to assess its potential in enhancing fisheries production for the benefit of the rural poor, who depend on the resources of the river for survival. The parameters measured were nitrate-nitrogen, nitrite-nitrogen and phosphate-phosphorus. Results show that nitrate varied between 40.43mg/L in September 2006 and 1.73mg/L in December 2007, Showing significant difference (P〈0.01) among months. The values recorded for nitrites varied between 0.2mg/L in September 2006 and 0.4mg/L in February 2008, showing significant (P〈0.01) variation among months. Values recorded for phosphorus was highest (0.05mg/L) in the month of October 2006 while the least mean value (0.32mg/L) was recorded in the month of May 2007 and showed significant (p〈0.01) variation in monthly means. It was concluded that the values of the measured parameters falls within tolerable range for enhanced fisheries development in the area. KEYWORDS: Limnology, Tropical, River, Monthly, Mean, Variation
    Keywords: Aquaculture ; limnology ; tropical river ; monthly mean variation
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 1-7
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  • 2
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    Effect of crude oil and some petroleum products on Clarias Gariepinus fingerlings (Catfish: Claridae) (2021)
    In:  managingeditor.olawale71@gmail.com | http://aquaticcommons.org/id/eprint/7316 | 5610 | 2013-02-14 11:04:09 | 7316 | Wilolud Journals
    Details
    Publication Date: 2021-07-02
    Description: Ninety (90) hatchery bred fingerlings of Clarias gariepinus (mean weight: 0.96 ± 0.1g) were randomly placed in 15 plastic baths (25 litres each) at the Research laboratory and were exposed to different concentrations of oil products to determine their effects on the fish, to facilitate inferential deductions that will enhance effective aquatic environmental management. Three (3) replicate basins of 5 experimental treatments (crude oil, petrol oil, kerosene oil, engine oil and control) were used at a concentration of 1.25ml. L-1. The control experiment was devoid of oil treatment. Six (6) fingerlings were placed in each replicate basin, flooded with 20 litres of clean tap water and fed with nutrafin cichilid food, 2 times daily at 3% body weight. The results showed that the feeding behaviour and swimming performances of fish were reduced after 24 hours of the addition of the various oil pollutants. Mortality of fingerlings in the oiled basins increased as the hours of exposure increased (i.e. 24, 48, 72 and 96 hours). Recovery was not immediate in the treated basin while surviving fingerlings in the control basins grew up to post-fingerlings after 90 days (3 months). There were significant differences (P〈0.01 and P〈0.05) in the effect of crude oil and the petroleum products on the mortality rate of C. gariepinus when exposed to oil pollutants at 1.25ml. L-1 concentration
    Keywords: Aquaculture ; Clarias gariepinus ; mortality ; pollutant ; fingerlings
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 24-30
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  • 3
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    Evaluation of fish biodiversity integrity of Ebonyi River (2021)
    FISON | Minna (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24083 | 19325 | 2018-05-12 14:17:44 | 24083 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: A study of the fish biodiversity integrity of Ebonyi River was conducted from September 2006 to February 2008 to generate fundamental data needed in Fisheries policy formulations and to assess the potential of the Fishery in enhancing quality food protein production. A total number of 1,080 fishes (comprising Fin-fish and shell-fish) were caught with hooks and lines of size 13, cast nets, gill nets and traps of mesh sizes of 50mm, 75mm and 100mm and identified using taxonomic keys. There were 39 species belonging to 20 genera and 14 families. Percentage gear catch composition was 43.6%,23.8%,17.7% and 15.3%for cast nets, gillnets, hooks and traps respectively. Zooplankton samples were also collected identified and analyzed using standard plankton analysis protocol. Cladocerans, rotifers, copepods and protozoans were represented in the identified species. Analysis of Variance (ANOVA) was used to determine the overall significance of the monthly means of all parameters and in locations and also to establish their correlation characteristics. Fisher's Least Significant Difference (F-LSD) was used to separate the means and to rank them. Family Amphilidae and Malapteruridae were not significant (p~B0.05) in monthly occurrence. Family Bagridae, Cichlidae and Clariidae showed highly significant (p〈0. 01) monthly differences while the remaining fish families exhibited significant (p〈0.05) differences in months. It was observed that artisanal fisherfolks used fishing gears whose mesh sizes deplete juvenile fish. It was concluded that there is an urgent need for improved management strategies to enhance sustainable productivity of the inland river system.
    Description: Includes: 3 tables;Also includes: 12 refs.
    Keywords: Fisheries ; Ecology ; Nigeria ; Ebonyi R. ; freshwater environment ; Fish ; Biodiversity ; Fishery policy ; Aquatic environment ; Inland fisheries ; Zooplankton ; Fishing gear ; Evaluation ; Fishermen ; Juveniles ; Depletion ; Ecology ; Stock assessment
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 103-108
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  • 4
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    Preliminary investigation of fish species abundance of Otammiri River, Owerri, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24626 | 19325 | 2018-05-22 06:25:03 | 24626 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: A study of fish species abundance of Otammiri River, Owerri, Nigeria was conducted from April to August, 2012. Four hundred and three (403)fishes belonging to 10 families, 16 genera and 21 species were collected from artisanal fishers using various fishing gears. The fish samples were taken to laboratory, identified, counted and their weights and lengths measured. The unnamed cichlid species ranked highest in percentage number and weight as well as Index of Preponderance (38.7%, 33.6% and 51.1% respectively), while the least were Polycentropis abbreviata, Hepsetus odoe, Synodontis omias, Chrysichthys aluensis and Chrysichthys furcatus each constituting 0.2% of the total number of fish collected. Among fish families, Cichlidae ranked highest in percentage number (82.63%) and weight (81.2%), followed by Hepsetidae (5. 7% and 8.0%) and Anabantidae (4.47% and 2.8% respectively). The least were Characidae, Notopteridae and Mochokidae. The presence of an unnamed fish species in the river is an indication that there could be more unknown aquatic living resources with strong potential benefits to the River. The information provided in this study reflects the potential of the fish resources of Otammiri. This will serve as invaluable baseline tool in fisheries management planning and policy formulations that will enhance the development of fisheries in the area.
    Description: Includes: 15 references.
    Keywords: Ecology ; Fisheries ; Polycentropsis abbreviata ; Hepsetus odoe ; Synodontis omias ; Chrysichthys aluensis ; Chrysichthys furcatus ; Nigeria ; Otammiri River ; Index of preponderance ; Fisheries management ; Otammiri River ; freshwater environment ; automation
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 237-240
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  • 5
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    Threats to fish biodiversity conservation in Echara River, Ebonyi State, Nigeria (2021)
    FISON | Minna (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24111 | 19325 | 2018-05-16 14:20:32 | 24111 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: A study on threats to fish species conservation in Echara River, Nigeria was carried out from September 2009 to February 2011 to generate inferential data for Fisheries policy formulations to assess the potential of the Fishery to alleviate malnutrition among the poor in the rural communities, and use of the living resources for teaching and research. A total number of 709 fishes comprising of Fin-fishes and shell-fishes belonging to 13 families, 19 genera and 40 species were caught in 216 fishing efforts, at 10 days interval using hooks and lines (size 13), cast nets, gill nets and traps of mesh sizes of 50mm, 75mm and l00mm respectively. Fish identification was done using taxonomic keys. Evaluation of fishing methods of the Artisans within the basin was by visual survey and the use of structured questionnaires. It was observed that during the dry season, 55% of artisanal Fishers used obnoxious methods to catch fish, ranging from chemical toxicants (14%), unselective Fishing gears (35%) and direct draining (6%). It was concluded that there is an urgent need for monitoring the impacts of human activities on freshwater systems and to evolve appropriate implementable management strategies, backed up by political will to check anthropogenic impacts that have deleterious effects on the fishery.
    Description: Includes: 2 figures and 1 plate;Also includes: 8 refs.
    Keywords: Ecology ; Fisheries ; Nigeria ; Ebonyi R. ; freshwater environment ; Fish ; Biodiversity ; Conservation ; Inland water environment ; Taxonomy ; Identification ; Species ; Catching methods ; Evaluation ; Artisanal fishing ; Collisions ; Overexploitation ; Pollution ; Climatic changes ; Fishery surveys ; Fishery policy
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 289-292
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