rajzás

Rajzás is a Hungarian term that translates to "swarming" or "hatching" in English, primarily used in the context of insect populations. It refers to the mass emergence of insects from their pupal or larval stages, often occurring at specific times of the year. This phenomenon is particularly noticeable with aquatic insects like mayflies, stoneflies, and caddisflies, whose larvae develop in rivers and streams.

The term can also be applied to other insects, such as ants and termites, where it describes the nuptial flight of winged reproductive individuals. During this flight, new colonies are established. In a broader, less common usage, "rajzás" can refer to the sudden, overwhelming appearance of any multitude of small creatures, like locusts or even mosquitoes. The ecological significance of rajzás is considerable, as it represents a crucial stage in the insect life cycle and provides a significant food source for many other animals, including fish and birds. The timing and intensity of rajzás can be influenced by environmental factors such as temperature, water levels, and daylight hours.