The Otago Regional Council is investigating what killed a whole lot of fish in a Dunedin stream over the weekend.
The council’s air pollution staff visited the location at Kaikorai stream and have taken water samples for testing.
Its regulatory common supervisor Richard Saunders stated the most probably state of affairs was that heat temperatures and decreased dissolved oxygen within the water exacerbated the underlying water high quality of the stream.
The opening of the coastal mouth on the Kaikorai estuary over the weekend was one other potential contributing issue within the fish deaths as it could possibly trigger water to flood and backfill into the Inexperienced Island leachate fields.
“Opening the coastal mouth is one thing ORC does commonly as a flood safety measure, and it is important to avoiding leachate from the Inexperienced Island landfill coming into the stream,” Saunders stated.
“Whereas opening the coastal mouth has not been related to fish kills previously, it’s doable that it was an exacerbating issue on this fish kill occasion – that is one thing we hope to grasp from our investigation.”
The incident highlighted that water high quality was everybody’s duty, he stated.
“City waterways have a number of the most degraded water high quality in New Zealand. It is essential that individuals are conscientious about what is going on into the streams and rivers of their backyards, and keep away from draining something that may negatively affect the setting.”
The Otago Fish and Recreation Council confirmed on social media yesterday that a whole lot of fish together with smelt, flounder, bullies, trout and inanga had died and have been littering the shoreline particularly across the Brighton Street bridge.
“It is too early to invest a few trigger and whereas that is the case, we would counsel not coming into contact with the Kaikorai estuary water, or the fish,” the council stated.
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