CAT6 Communication Cable for the fish farming industry.

Aquaculture and Fish Farming Subsea Cable — Engineered for Seawater, Biofouling, and Long-Term Marine Immersion

This CAT6 Communication Cable for the fish farming industry. is purpose-engineered for the electrical infrastructure of modern fish farming and aquaculture installations. Unlike general-purpose marine cables, this cable addresses the specific challenges of fish farm environments: continuous seawater immersion at shallow depths (5–50 m), high biofouling pressure, dynamic loading from tidal current on pen mooring lines, motor drives for net washers and feed systems, and the need for Cat6 network connectivity for real-time water quality monitoring and IP camera systems.

Available in power-only, Cat6 communication, hybrid power+Cat6, and electro-optical configurations (with single-mode fibre for long-distance site networks), this cable family covers the complete electrical infrastructure requirements of salmon farms, offshore fish pens, recirculating aquaculture systems (RAS), and aquaculture monitoring buoys.

Key Design Features

• 1 kV flexible motor cable — IEC 60502-1 (or equivalent) rated for variable frequency drive (VFD) motor connections to net washers, underwater lights, feed pumps, and current generators in fish farm pens
• Cat6 communication core — 4-pair Cat6 (1,000 Mbps Gigabit Ethernet) alongside power conductors for IP cameras, water quality sensors, and feed management system connectivity
• Single-mode fibre hybrid — 1× SM optical fibre + power conductors for long inter-pen fibre backbone networks on large salmon farm sites with multiple pens over 500 m
• Biofouling-resistant PUR jacket — polyurethane outer sheath formulated for long-term seawater immersion; tested for resistance to marine biofouling organisms, UV, and ozone at fish farm depths
• Floating configuration — foam PUR jacket variant provides positive buoyancy for surface power drops from pontoon to mooring winch; prevents cable entanglement with anchor mooring lines
• High-visibility red/orange jacket — floating hybrid ROV/camera tether versions in high-visibility red for diver safety during pen operations
• Twisted pairs for water quality sensors — individually shielded 24 AWG pairs for RS-485 sensor buses (dissolved oxygen, temperature, salinity, pH, turbidity)
• Custom hose-in-cable construction — central hose for compressed air or water supply to shore, combined with power and data in one outer jacket for combined utility tethers

Electrical & Mechanical Specifications

Typical Applications

• Fish pen power supply — main power drop from pontoon or shore junction box to underwater lighting, net washer motors, and feeding systems
• Net washer motor cable — 1 kV VFD-rated flexible cable for remotely operated net washer drive motors submerged at pen depth
• Water quality monitoring — combined Cat6 + RS-485 + 24V power for multi-parameter sensor strings (DO, pH, salinity, temperature, turbidity)
• IP camera and lighting cable — power + Gigabit Ethernet for underwater IP cameras monitoring fish behaviour, net integrity, and predator intrusion
• ROV tether for pen inspection — high-visibility red floating hybrid EO tether for diver or ROV pen net inspection operations
• Inter-pen fibre backbone — SM fibre + power hybrid for connecting multiple pens to site SCADA network over 200–500 m distances
• Shore-to-pontoon combined utility — power + data + compressed air hose in one jacket for fully integrated pontoon service drops
• Recirculating Aquaculture System (RAS) — land-based indoor tank system sensor and motor wiring for intensive production facilities

Why Fish Farm Cables Need Specialist Design

Biofouling — The Silent Destroyer

Standard marine cables submerged at fish farm depths accumulate biofilm within weeks, followed by barnacles, mussels, and other hard-fouling organisms within months. Hard fouling at bend points restricts cable movement, concentrating flex stress and causing accelerated fatigue. Our PUR jacket compound provides a low-surface-energy interface that slows hard fouling attachment — extending service life 2–3 times compared to standard PE or rubber jacketed cables in similar environments.

1 kV VFD Motor Cables vs Standard Control Cables

Underwater motor drives for net washers and current generators produce PWM switching pulses at frequencies of 2–20 kHz. Standard 300V or 600V marine control cables have insufficient insulation voltage rating for VFD use — voltage spikes from inverter switching can reach 2× the rated output voltage at the motor terminals, causing insulation breakdown. Our 1 kV rated motor cables are manufactured with cross-linked polyethylene (XLPE) insulation that handles VFD peak voltages safely.

Cat6 at Fish Farm Depths

Standard Cat6 cables are designed for air-conditioned server rooms and dry building installations — not for continuous seawater immersion. Our waterblocked Cat6 element within fish farm hybrid cables maintains TIA/EIA-568B Gigabit Ethernet performance with <5% parameter change at 50 m seawater immersion, enabling real-time HD video, sensor data aggregation, and remote control over the same cable that carries motor power.

High-Visibility Tether Safety

During pen dive operations, divers sharing water space with ROVs face collision risk from dark-coloured tethers. High-visibility red and orange floating tethers are immediately visible to divers and provide a reference line for orientation. The positive buoyancy of foam PUR tethers keeps the cable clear of divers' route to the surface — an important safety feature in emergency ascent situations.

Hose-in-Cable for Combined Utility Service

Fish farm pontoons require compressed air for aeration, pneumatic actuators, and air lift pumps — in addition to electrical power and data. Running separate hoses and cables multiplies installation cost and creates a cluttered pontoon deck with multiple penetration points. Our hose-in-cable design integrates a central polymer hose (6–25 mm bore) with power and data conductors in one outer jacket, providing a single tidy installation from shore to pen.

Available Aquaculture Cable Configurations

Installation and Maintenance Guidelines

Pen Installation Best Practice

Route submarine power cables along pen mooring lines using UV-resistant cable ties at 0.5 m intervals — this prevents cable loops forming in tidal current that accumulate hard fouling and chafe on pen net attachment points. Allow a 10–15% length surplus in each pen drop to accommodate tidal height variation and pen movement in swell without placing the cable under tension.

Connector Selection

Fish farm seawater is highly corrosive — use marine-grade stainless steel connector bodies or glass-filled nylon connector housings rated for continuous seawater immersion. Avoid zinc alloy or aluminium alloy connector bodies that corrode rapidly in salt water. For Cat6 connections, use IP68-rated waterproof Ethernet connectors tested to 10 m immersion depth — standard IP67 Ethernet connectors are inadequate for fish farm depth exposure.

Annual Inspection Schedule

Fish farm cables operate in a high-biofouling environment — annual inspection should include: removal of hard fouling at bend points, inspection of jacket for cracking at pen attachment clamps, continuity and insulation resistance testing for all power and signal conductors, and OTDR testing of optical fibres (where installed). Replace any section showing jacket cracking, conductor resistance increase greater than 20% of baseline, or optical loss increase above 3 dB.