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Monitoring of net cage geometry

The geometry of submersible fish cages is critical to ensure stability and controlled shape both at the surface and when the cage is submerged. The geometry is typically circular or polygonal, with a rigid or semi-rigid floating and support frame combined with a deep, symmetrical net bag to ensure even load distribution. When the cage is submerged, the force balance between buoyancy, self-weight, and hydrodynamic loads changes, and the geometry must therefore be designed so that the net, sinker ring, and frame maintain the intended shape without collapse or unwanted deformation. Proper cage geometry is essential to reduce current-induced loads, prevent net collapse, ensure adequate water exchange, and maintain fish welfare, while keeping loads on moorings and structural components within design limits.

The main challenge with submersible cages is that they combine advanced mechanics, complex hydrodynamics, and strict requirements for biological and operational control. When the cage is submerged, the load conditions change significantly due to increased current exposure and reduced wave action, placing high demands on structural design, buoyancy control, and mooring systems. The geometry must be maintained throughout the water column to prevent net deformation, uneven loading, and reduced water exchange. At the same time, inspection, operations, and maintenance become more demanding when the structure is below the surface, with limited visual access and greater reliance on sensors and remotely operated systems. In addition, fish welfare must be ensured by maintaining adequate light, oxygen, and space for natural behavior even when submerged. Overall, submersible cages require precise control, robust systems, and continuous monitoring to operate safely and efficiently over time.

This is how PingMe can help address these challenges:

  • Continuous monitoring of cage geometry and motion in submerged conditions
  • Detect early deviations in geometry before deformation becomes critical
  • Generate alerts when abnormal changes in load distribution and structural stresses are detected
  • Measuring currents relevant for cage stability, cage geometry and feeding
  • Continuous logging of environmental data critical for fish welfare
  • Deliver documentation to support safe operation and compliance with technical requirements

Specifications of the PingMe system

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