Backswimmer beetle

Systematic position. Suphrodytes dorsalis is a representative of the order Coleoptera, belonging to the Noteridae family. This small aquatic beetle is a specialized inhabitant of freshwater ecosystems, often found in shallow, stagnant water bodies across Europe and temperate regions.

Host species and impact. While it is not a direct threat to terrestrial crops, it is a significant pest in aquaculture. The species poses a specific danger to commercial fish farms, primarily during the larval rearing and fry development stages, where high densities of fish are vulnerable to predation.

Biology and life cycle. The life cycle involves complete metamorphosis, consisting of the egg, three larval stages, pupa, and adult beetle. Adults are highly mobile and capable of flight, allowing them to colonize new aquatic habitats. Larvae are voracious predators, equipped with specialized mouthparts for hunting small invertebrates and fish fry.

Damage and harmfulness. The harmfulness of this species lies in its direct predatory behavior. Both adults and larvae actively feed on the fry of farmed fish. In intensive aquaculture systems, an uncontrolled population of Suphrodytes dorsalis can result in substantial mortality rates among the young fish population, leading to significant economic losses.

Control measures. Management of Suphrodytes dorsalis populations focuses on environmental and physical control methods to minimize predation:

• Thorough pond drainage and drying during the off-season to eradicate larvae.
• Systematic control of aquatic vegetation to reduce breeding and hiding sites.
• Use of mesh filters in water intake systems to prevent adult beetles from entering fish ponds.
• Strategic timing of fish stocking to avoid peak periods of beetle activity.