Pond Olive Mayfly vs Trico Mayfly

Side-by-side species comparison

Pond Olive Mayfly

One of the few mayflies that breeds in still water including garden ponds and rain barrels. Unusually for a mayfly, females are ovoviviparous.

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This is one of the only mayflies that gives birth to live nymphs rather than laying eggs, a unique trait in the order.

A tiny mayfly that forms enormous morning spinner falls over calm streams and rivers. Males have distinctive white bodies with black thoraxes.

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Trico spinner falls create such dense blankets of spent mayflies on the water surface that trout gorge themselves to satiation.