When we lived by Kootenay Lake we would see this every year with the Kokanee. The general consensus was a water temperature inversion. I have a quote from The Fraser Coast Regional Council about such a situation.
"The Fraser Coast Regional Council in south-east Queensland says it is likely a large number of fish found dead last week died from a lack of oxygen in the water.
About a tonne of dead fish has been removed from Ululah Lagoon since last Wednesday.
Council environmental spokesman Andy Gaze says water testing results indicate a change in temperature due to recent rain.
"We did some investigations on Thursday and Friday and the further we've looked into this issue, the more we are convinced it was a temperature inversion problem where colder water from the rains hit the warmer water of the lake, flip over and spreading oxygen throughout the lake," he said.
"However, there's not enough oxygen in the receiving waters to actually support the fish life.
"Looking at the type of fish that have died we are only having fish kills. Only fish dying and not other animals in the area and the fact that we did have those rains receiving into the warmer waters and the tests we did on the site in regard to oxygen levels they very much look like it was lack of oxygen in the water that lead to the fish dying."
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