Mayfly bloom underway in Szeged

One of Europe’s most enchanting natural events is now taking place along the Tisza River in Szeged, as millions of Giant Mayflies (Palingenia longicauda) emerge in a rare and short-lived spectacle known as the Tiszavirágzás, or Tisza blooming.

The annual phenomenon – marked by the synchronized hatching of Europe’s largest mayfly species – began earlier than usual this year, with the first swarms reported in early June. The bloom is still underway and continues to draw nature lovers, photographers, and curious onlookers hoping to witness its fleeting beauty.

In Szeged, the best places to observe the event are usually near the meeting point of the Tisza and Maros rivers and around the Belvárosi Bridge. The best time to watch is in the evening, typically after 7 p.m., when the insects rise from the water and fill the air in swirling clouds.

After living for three years as larvae in the riverbed, the adult mayflies live for only a few hours. In that time, they mate midair, lay their eggs on the water, and complete their life cycle. The eggs sink into the riverbed, beginning the cycle again.

The exact timing of the bloom changes each year, depending on water temperature and levels. Although it normally peaks in mid-June, this year’s early start suggests it may end sooner – though it remains ongoing for now.

The Tisza Mayfly is a protected species in Hungary. Disturbing the insects or driving boats through swarms is prohibited and can result in fines of up to HUF 150,000 (about $410). Authorities urge visitors to enjoy the bloom respectfully and avoid harming the fragile insects.

The Tiszavirágzás is not just a natural wonder – it’s a symbol of the river’s ecological health, and a fleeting reminder of nature’s beauty and fragility.

Featured image (archive): Szilvia Molnar / Szegedify