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  • 1
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    Fisheries Society of Nigeria | Lagos
    In:  http://aquaticcommons.org/id/eprint/23213 | 19325 | 2018-03-17 12:40:39 | 23213 | Fisheries Society of Nigeria
    Publication Date: 2021-07-13
    Description: A survey of ectoparasites of three species of fish (Oreochromis niloticus, Auchenoglanis occidentalis and Bagrus bayad) of River Benue was carried out for a period of three weeks. Samples were collected directly from fishermen, at the river side (River Benue) in a plastic bucket and were carried to the laboratory. A smear samples from the skin were taken. Fins were cuted and gills were dissected and examine individually in saline solution in a Petri dish and platyhelminthes parasites as the most common ectoparasites of threes three species (Oreochromis, Auchenoglanis, and Bagrus). A total number of five hundred and seventy two (572) parasites were observed. Result of this study reveals that the large number of parasites were found on the gills (65%) of the three fish species studied, compared to skin (16%) and fins (19%) of the total parasites observed; among the three fish species studied. O. niloticus carries 33% while A. occidentalis carries 41% and B. bayad carries 26% of the total parasites seen. There was negligible difference in the level of infestation in the sexes (i.e. male and female) of Oreochronis and Bagrus. However, a great significance difference in the level of infestation was found in the sexes of Auchenoglanis
    Description: Includes:- 3 tables.;8 refs.
    Keywords: Ecology ; Fisheries ; Auchenoglanis occidentalis ; Oreochromis niloticus ; Bagrus bayad ; Nigeria ; Benue R. ; freshwater environment ; Ectoparasites ; Parasites ; Infestation
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 10 - 14
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  • 2
    Publication Date: 2022-08-17
    Description: A clear understanding of socio-technical interdependencies and a structured vision are prerequisites for fostering and steering a transition to a fully renewables-based energy system. To facilitate such understanding, a phase model for the renewable energy (RE) transition in MENA countries has been developed and applied to the country case of Yemen. It is designed to support the strategy development and governance of the energy transition and to serve as a guide for decision makers. The transition towards REs is still at a quite early stage in Yemen. The military conflict has prevented the implementation of most of the planned large-scale renewable projects. The political instability, the high dependence on fossil fuels, and poor administrative performance are the most pressing concerns for Yemen's electricity sector. At an operational level, Yemen requires a total retrofit of the electricity infrastructure and needs to expand its overall capacity while improving its efficiencies. Despite these challenges, rebuilding the energy system after the political turmoil and the subsequent violent conflicts could offer Yemen the capability to transition towards renewables. This will provide short-term and long-term opportunities and avoid stranded investments in fossil-fuel capacities. The priority is to improve the framework conditions for RE in Yemen, starting with the development of a long-term strategy up to 2030 and beyond. Also, an appropriate and transparent legislation must be created. Furthermore, based on the legislation, clear regulations for REs must be introduced, and a realistic timeframe for expansion must be established in order to promote acceptance and market development on a large scale. The results of the analysis along the transition phase model towards 100% RE are intended to stimulate and support the discussion on Yemen's future energy system by providing an over-arching guiding vision for the energy transition and the development of appropriate policies.
    Keywords: ddc:600
    Repository Name: Wuppertal Institut für Klima, Umwelt, Energie
    Language: English
    Type: report , doc-type:report
    Format: application/pdf
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