Protection on Demand
ELDI has developed a practical and user-friendly skirt solution designed to protect against Perlesnormanet jellyfish. The skirt is engineered with a standard depth of 15 meters and can be installed directly on the cage as an emergency measure, ensuring rapid response when conditions require it.
Manufactured from a fully permeable textile, the skirt allows continuous water exchange, maintaining stable oxygen levels inside the cage while effectively limiting jellyfish ingress. This ensures protection without compromising water quality or fish welfare.
The solution is designed to integrate seamlessly into daily operations. Stored in a PVC pocket mounted directly on the cage, the skirt remains out of the way until needed. Deployment is simple and fast—activated by pulling a rope, allowing the skirt to drop to full depth and provide immediate protection. When conditions normalize, the skirt is easily retrieved and stored back in the pocket.
This solution supports safe operations, reduces production risk, and helps safeguard fish welfare in jellyfish-prone environments.
In a December 2023 article published by iLaks.no, Lars Helge Stien, Research Director for Animal Welfare at the Institute of Marine Research, highlights findings from an ongoing case study conducted in collaboration with Mowi. The study examines the presence of Perlesnormanet jellyfish at two empty sea cages—one equipped with an eight-meter lice skirt and one without.
Although Perlesnormanet is observed across multiple depths, preliminary results indicate that skirts can be an effective mitigation measure. Approximately 75% of the jellyfish observations were recorded at depths below 15 meters, and 63% below 10 meters. The cage fitted with a skirt showed a significantly lower presence of Perlesnormanet compared to the cage without a skirt.
These findings support the use of skirt solutions as a practical measure to reduce jellyfish exposure and improve operational security in affected areas.