Source:Â Fish and Game NZ Hundreds of eels and trout have perished in lower Silverstream in what appears to be a low oxygen and high heat environment. Mosgiel angler Bevan Campbell who alerted Fish & Game Otago and the Otago Regional Council said he had never seen anything like it. Both agencies were on site last evening. The trout use the lower Silverstream as a refuge when the Taieri is in flood and dirty but it looks like that was the wrong option Mr Campbell said. Otago Fish & Game Chief Executive Ian Hadland said the likely cause of death was warm, low oxygen inflows of ponded floodwater water from surrounding farmland.