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One university lecturer suggested a combination of unusual weather since the start of the year and the coronavirus lockdown may be causing the "large concentrations of chironomid".

“Chironomid midges are a gigantic part of the food web,” DeLisi said.

"Chironomid midges are a gigantic part of the food web," DeLisi said.

The slide reveals a handful of the 3,332 chironomid larvae plucked from a dinner-plate sized sample of muck from the lake bed just off the pizza parlor dock, and that number has everything to do with how well Diamond Lake’s trout will grow this year and what fly in the box likely will best catch them.

His setup of two chironomid flies was working wonders on Shevlin Pond.