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dc.contributor.authorAnsah, Yaw Boamahen_US
dc.date.accessioned2014-03-14T20:34:22Z
dc.date.available2014-03-14T20:34:22Z
dc.date.issued2010-04-09en_US
dc.identifier.otheretd-04262010-133942en_US
dc.identifier.urihttp://hdl.handle.net/10919/31948
dc.description.abstractThis study was carried out to characterize ponds and aquaculture systems, and also to determine both the potential and actual impacts of pond aquaculture effluents on receiving stream quality in the Ashanti and Brong Ahafo regions of Ghana. Water, fish and macroinvertebrate samples were collected from upstream, downstream and nearby reference streams of, and questionnaires administered to, 32 farms. Total settleable solids were higher in ponds than reference streams (p = 0.0166); suspended solids was higher in ponds than reference streams (p = 0.0159) and upstream (p = 0.0361); and total phosphorus was higher in ponds than reference (p = 0.0274) and upstream (p = 0.0269). Total nitrogen was most clearly higher in ponds than all other locations: p = 0.0016, 0.0086 and 0.0154 for the differences between ponds and reference, upstream, and downstream respectively. BOD5 level was also higher in ponds than all locations (p = 0.0048, 0.0009, and 0.0012 respectively). Also, non-guarding fish species were more abundant in reference streams than downstream (p = 0.0214) and upstream (p = 0.0251), and sand-detritus spawning fish were less predominant in reference streams than upstream (p = 0.0222) and marginally less in downstream locations (p = 0.0539). A possible subsidy-stress response within study streams was also observed. Hence, ponds are potential sources of these water quality variables to receiving streams. Effluent-receiving streams, generally, were not much different from reference streams in terms of most the metrics of community structure and function used in the comparisons. Hence, even though receiving streams in Central Ghana may not be severely impacted by aquaculture effluents at the moment, the management of pond effluents will determine the scale of future impact. Vegetable, cereal, and livestock farming could serve as additional sources of fecal streptococci and coliform bacteria and nutrient-enrichment within the study area, besides aquaculture, and so these industries must also be included in efforts to minimize pollution of these streams.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartAnsah_YB_T_2010.pdfen_US
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjectbiomonitoringen_US
dc.subjectGhanaen_US
dc.subjectbenthic macroinvertebratesen_US
dc.subjectstream ecologyen_US
dc.subjectwater qualityen_US
dc.subjectaquaculture effluentsen_US
dc.titleCharacterization of pond effluents and biological and physicochemical assessment of receiving waters in Ghanaen_US
dc.typeThesisen_US
dc.contributor.departmentFisheries and Wildlife Sciencesen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineFisheries and Wildlife Sciencesen_US
dc.contributor.committeechairFrimpong, Emmanuel A.en_US
dc.contributor.committeememberVoshell, J. Reese Jr.en_US
dc.contributor.committeememberOrth, Donald J.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-04262010-133942/en_US
dc.date.sdate2010-04-26en_US
dc.date.rdate2010-05-10
dc.date.adate2010-05-10en_US


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