Plenty of mayflies would still get away for their one ecstatic night of reproducing in the treetops.

NPR: Excerpt: 'World Made By Hand'

Roos ties an imitation fly that looks like the hatch of tiny mayflies floating in the current.

FORBES: Magazine Article

Norman Robinson from the Environment Agency said 100% of invertebrates including pond skaters, water shrimps, water snails, leeches, and Mayflies, close to the source of the chemical spill, had died.

BBC: River Nene pollution wipes out invertebrates