Backbone 290Kg 2.5MM Green Longline Nylon Mono Mainline – Heavy-Duty Performance

Sea fish presents the Backbone 290Kg 2.5mm Green Longline, a mainline built to endure the harshest offshore conditions. With a 290 kg breaking strength and a 2.5 mm nylon monofilament backbone, this line is engineered for the heavy loads encountered when targeting very large pelagic species in deep water. Delivered in a long 1000-metre length, it minimizes the need for frequent re-spooling during large-scale deployments.

The backbone features permanently moulded stops at a precise 2.0 m spacing. This design delivers repeatable rigging, reduces line movement under load, and speeds up setup across multi-line rigs, translating to safer, more efficient operations on busy offshore boats.

The 2.5 mm nylon monofilament is reinforced for abrasion resistance, standing up to reef contact and frequent handling—two realities of commercial longlining. The high-visibility green color boosts on-deck visibility, improving handling and safety during line deployment and retrieval in rough seas or low-light conditions.

Ideal for professional operators in the hardware and rope categories of fishing gear, the Backbone 290Kg 2.5MM Green Longline stands out for its combination of strength, durability, and repeatable rigging. Sea fish is trusted by fleets for rugged, reliable longline gear that delivers consistent performance and long service life in demanding marine environments.

Designed for real-world longline rigs

Use cases include deep-water longlining where deployments are measured in hundreds or thousands of metres and line handling must be efficient and predictable. The 1000 metre length is perfect for outfitting large mainlines, while the molded stops eliminate guesswork during rigging, helping crews work faster with fewer mistakes.

Specs at a glance

• Diameter: 2.5 mm nylon mono-filament
• Breaking strain: 290 kg
• Length: 1000 metres in a single hank
• Stops: Permanently moulded at 2.0 m spacing
• Material: High-strength nylon mono with reinforced abrasion resistance
• Color: High-visibility green
• Brand: Sea fish
• Application: Deep-water, high-stress longlining for very large species

Why choose Sea fish Backbone for your longline operations

With Sea fish backing, you’re choosing a gear line designed for rugged reliability and repeatable performance. The Backbone combines professional-grade durability with practical, repeatable rigging that keeps crews safe and deployments efficient, even under heavy loads and in challenging offshore conditions.

Care and best practices

Inspect for nicks and wear after deployments, especially after contact with reefs or abrasive seabed. Store in a cool, dry place away from direct sunlight to preserve nylon properties. For best results, pair the Backbone with compatible hardware and follow established longlining procedures to maximize service life and safety.