Magnifier glass
The Norwegian flag

Perma skirt

Sea lice are, along with escapes, is considered the biggest challenge for the aquaculture industry today. We are seeing major sea lice infestation on fish residing in the upper water layers. Shielding of the upper portion of a cage may therefore reduce sea lice infestation significantly.


Advantages with permanent skirts:

  • 50-80 % less sea lice infestation
  • Fewer delousings
  • Less use of chemicals
  • Less handling of fish
  • Reduced need for cleaner fish


Botngaards perma skirts are tailormade to the individual locality. Factors as our customers' needs, cage size, durability and design are important. This way we can deliver a product that makes the job for the fish farmers as easy as possible.


Read our brochure on perma skirts


Technical Documentation

Perma skirt has been approved as permanently attached supplementary equipment by the Norwegian engineering and certification company Aquastructures. It is verified that perma skirts satisfies the requirements set in NYTEK Regulation and NS 9415: 2009. Drawings, calculations and designs are examined. The equipment is evaluated and documented for use within the specified limits of Aquastructures AS in:

  • Technical report:
    Analysis of perma skirt for Botngaard. Doc no. TR-30678-1751-1
  • Technical report:
    Methodology for modelling perma skirt for Botngaard. Doc no. TR-30678-1751-2



Water penetration through the fabric is examined in a separate test at the US Naval Academy in Annapolis, Maryland. The test showed that the fabric lets through 285 litres per m² per minute at a flow rate of approximately 17cm/seconds at a right angle to the fabric. If the flow rate is higher, more water will pass through and opposite at lower flow speeds it will pass through less water.


Scroll to top