Video of Belle River fish fly invasion takes Facebook by storm

A Belle River, Ont., woman is wondering if she wronged a mayfly in a previous life, after a plague of them descended like "a sheet of blackness" on her suburban driveway.

KellyRivardscreamed when she woke up to an infestation of the bugs, also known as fish flies in some regions,and enlisted her husband, Sylvain, to go into battle with apressurewasher.

A video of him clearing the driveway with his shirt covering his nose from the fishy smell is going viral onFacebook, with more than 1.2 million views and 7,000 shares as of Monday evening.

"Oh my goodness, that is crazy," Kelly Rivard can be heard saying over the roar of the pressurewasher, disgust thick in her voice like the bugs piled up on her property.

It's unclear how many mayflies Rivard's husband had to reckon with, but they covered half of her driveway and filled three-and-a-halfindustrial-sized garbage bags. Several days later the smell still lingers.

"It was bad, the smell was just atrocious. I mean, it still smells at the driveway now," said Rivard."It was a blanket of them. And you could see the wings. My lawn was just fluttering. It was just awful. It's gross."

Mayflies are winged aquatic insects about three centimetres long.Their flying, adultlifespanlasts less than two days long enough to mateand die. While the female insects die off above water, the males fly inland to die.

The annual invasion of the bug-eyed pests is a good sign, said JeffSchaeffer, a biologist with the Great Lakes Science Center. They're an important source of food for fish, especially the varieties people like to eat.

The scientist did his dissertation on the insects and said there was a period from the1950sto the1980swhere mayflies all but disappeared.

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"Their return was actually seen as a very positive thing by virtually all the biologists, although we do apologize to the coastal residents," he said, laughing. "This is the price you pay for living in the middle of a healthy ecosystem."

Rivard doesn't mind doing her bit for the environment, but wonders why the fish flies swarmed her driveway.

Schaeffer suspects it could be something as simple as the colour of the concrete on the driveway.

"That was a very heavy concentration," he said. "It could be a matter of lighting, the weather conditions on the night those flies emerged from the lake or there could be just a lot of them this year."

Turn off the lights and hope for the best

The biologist said the best way to avoid having your home overrun by fish flies is to turn off any outdoor lights and close the curtains.

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Even if people take those steps, there's no saying whether crowds of the confused insects will descend on their house and select it as their final resting place. Still,Schaeffersaid that crunch of dead bugs beneath people's feet is something they should be thankful for.

"Every time you see a mayfly you should be reminded that having them around is a good thing," he said. "Except for that one week a year."

Internet sensation

Rivardhas become something of a celebrity. She's been bombarded with Facebookmessages and more than 120 friend requests. She went into a hardware store Monday, and three of the five employees had seen the video onFacebook.

"I'm stunned. I can't believe it and I just think to myself why? I mean, it's fish flies," saidRivard. "I told someone that I think they're out in a vengeance for me. Maybe I did something to them in a prior life."