Meganyctiphanes

Meganyctiphanes (Meganyctiphanes norvegica) belongs to the order Euphausiacea and the family Euphausiidae. In an agronomic and aquacultural context, this organism is often considered a specific pest that can cause indirect damage by competing for food resources or physically impacting the juvenile stages of valuable fish and shellfish species.

This organism lives primarily in the water column and serves as a vital component of the zooplankton community. Its life cycle encompasses several developmental stages: nauplius, metanauplius, calyptopis, furcilia, and juvenile stages. Adult individuals perform vertical migrations, which complicates control efforts in open water systems utilized for commercial aquatic farming.

The pest pressure of Meganyctiphanes is primarily linked to competition for food sources with juvenile fish. In enclosed sea cages or coastal farms, mass aggregations of these crustaceans can lead to the rapid depletion of natural plankton, resulting in stunted growth of the target crops and inducing stress in the cultivated stock.

The damage caused manifests as a reduction in harvest yield and poor stock health due to a lack of high-quality feed. In certain scenarios, high population density of Meganyctiphanes can lead to the clogging of filtration systems and intake equipment at hydro-technical facilities, incurring significant operational costs for agricultural enterprises.

Protection and control measures include:

• Continuous monitoring of plankton population density within the farming area.
• Installation of fine-mesh protective nets on cages to prevent the entry of large crustacean swarms.
• Optimization of feeding schedules to minimize loss during periods of high plankton activity.
• Utilization of light-based traps at night to divert aggregations away from nursery zones.