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I wasn't aware that owaso had froze out last year... I know that Centerville lake did.
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They don't know exactly what caused it. Sounds like it didn't freeze out- here's how they put it in an article I read:
"A leading theory -- a bends-like condition from high-levels of dissolved gases -- couldn't be verified or dismissed without having access to fish that had died recently. Officials suspect such a cause -- "gas-bubble disease" -- based on the clear ice conditions that allowed photosynthesis to continue without an escape for gases such as oxygen, carbon dioxide or nitrogen. In addition, water samples taken on days immediately after the kill revealed unusually high levels of saturated oxygen. (Low oxygen levels typically develop in late winter, not early ice.)"
Reports are that fish are still biting there, and that the kill was just a fraction of the population. One lake I wish I could ice fish is Vadnais Lake! It would have to be a covert op..