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Monitoring of invertebrate and fish recovery following river rehabilitation using rotenone in the Rondegat River
Expanded Title:A South African perspective to Piscicide Treatments Fish invasions have been cited as a primary threat to imperilled South African fishes and other aquatic fauna. As a result, the management and control of alien invasive species is a legislated priority in South Africa. From a river rehabilitation perspective, eradicating alien fish allows for the rehabilitation of several kilometres of river, with very significant benefits for the endangered fish species present and for the associated aquatic biota. In South Africa,the piscicide rotenone is one of the preferred methods for achieving eradication.While alien fish removal by rotenone has been demonstrated to be an effective management tool, it has been surrounded by controversy in recent years due to its known and unknown collateral effects on non-target aquatic organisms. As a result, monitoring is an essential component of eradication projects. The primary objective of the research reported in this.Technical Report was to use the Rondegat River as a case study to (1) first assess the efficacy of South Africa’s first alien fish eradication project, and (2) provide information of how the ecosystem in a river recovers following treatment with rotenone. The specific aims of the project were to: • Determine how the Rondegat River ecosystem responds to the removal of alien fishes over a three year period (2012-2015). • Assess rates of recovery of the invertebrate community following rotenone treatment. • Assess the recovery rates of native fish communities following rotenone treatment. • Test the hypothesis that native invertebrate and fish communities rebuild to approximate those in the non-invaded zone of the river. • Develop recommendations for monitoring fish and invertebrate populations for future river rehabilitation projects. • Develop human capacity in fish and invertebrate monitoring.
Date Published:01/06/2016
Document Type:Research Report
Document Subjects:Ecosystem - Invertebrates, R & D - Research capacity
Document Keywords:Guidelines
Document Format:Report
Document File Type:pdf
Research Report Type:Standard
WRC Report No:2261/1/16
ISBN No:978-1-4312-0788-6
Authors:Weyl OLF; Barrow S; Bellingan T; Dalu T; Ellender BR; Esler K; Impson D; Gouws J; Jordaan M; Villet M; Wasserman RJ; Woodford DJ
Project No:K5/2261
Organizations:South African Institute of Aquatic Biodiversity; Stellenbosch University; Rhodes University; University of the Witwatersrand (SCEE)
Document Size:3 275 KB
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