Dr. Toni Aubynn, Head of Corporate Affairs and Social Development of Gold Fields Ghana Limited (GGL) said some unknown persons, have been poisoning some streams and rivers near mining concessions.He said the negative act, apart from tarnishing the image of mining companies also destroyed marine life and created serious environmental problems for inhabitants within the area.Dr. Aubynn said these at an end of year get-together organised by the GGL for journalists in the Western Region at Takoradi on Thursday."Some individuals and groups clandestinely throw certain chemicals into streams and rivers to catch more fish", he added.Dr. Aubynn therefore, appealed to the media and other stakeholders to assist mining companies to halt the trend.