European river lamprey

The European river lamprey (Lampetra fluviatilis) belongs to the order Petromyzontiformes and the family Petromyzontidae. It is a jawless vertebrate organism known for its parasitic lifestyle, utilizing a suction-cup mouth lined with keratinized teeth to attach to its prey.

In the context of agriculture and aquaculture, the river lamprey is categorized as a biological pest that threatens commercial fisheries and fish farms. While it does not interact with terrestrial crops, its negative impact on aquatic livestock constitutes a significant economic issue within the industry.

The lifecycle of the lamprey involves several stages. The larval stage, known as ammocoetes, persists for several years in river sediments where they filter-feed. Upon metamorphosis, they migrate to sea or large lakes, transitioning into parasitic adults that feed on the body fluids and flesh of fish, leading to severe debilitation.

The damage caused to fish stocks is significant. Lamprey feeding leaves deep, circular wounds that are highly prone to secondary infection. In aquaculture settings, high density of fish makes them vulnerable to lamprey attacks, often resulting in high mortality rates, reduced growth performance, and decreased market value of the fish stock.

Protective measures focus on physical exclusion and habitat management. This includes the implementation of fine-mesh screens on water intake systems to prevent entry into hatchery ponds. Managing the aquatic environment by removing excessive organic sedimentation, which serves as a habitat for larvae, is also critical for controlling population expansion.