Longline Fishing Explained: How It Works and What Anglers Should Know

The water is still dark, the deck is quiet, and the first bit of light is just starting to show over the horizon. For most recreational anglers, fishing means a rod, a reel, a lure or bait, and the feel of one fish hitting one line. Longline fishing is a different world.

 

Longline fishing explained simply: it is a commercial fishing method that uses one long mainline with many shorter lines attached to it. Those shorter lines carry baited hooks. Depending on how the gear is set, longlines can fish near the surface, through the water column, or close to the seafloor. NOAA Fisheries describes pelagic longlines as a mainline with gangions and baited hooks, with gear suspended at different depths depending on target species.

 

This guide breaks down how longline fishing works, what it catches, why commercial fishermen use it, why it gets criticized, and what everyday anglers should know before forming an opinion.

 

What Is Longline Fishing?

 

Longline fishing is a commercial fishing method that uses a long mainline with shorter branch lines, called gangions or snoods, attached at intervals. Each branch line carries a baited hook. The gear may be suspended in open water or weighted near the seafloor to target different species.

 

That is the clean answer.

 

The confusion usually comes from the phrase “long line fishing line.” Some people hear it and think it means using extra-long fishing line on a rod and reel. That is not what longline fishing means. Longline fishing is a gear system, not just a long spool of line.

 

For a deeper technical reference, the NOAA Fisheries guide to pelagic longlines explains how the mainline, hooks, bait, depth, and high-flyer buoys work together in open-water longline fisheries.

 

How Longline Fishing Works

 

Longline fishing works in stages. A vessel deploys a mainline, attaches baited hooks on branch lines, marks or supports the gear with floats or buoys, lets the line soak, then retrieves it and sorts the catch.

 

Mainline, Gangions, Hooks, and Bait

 

The mainline is the backbone of the system. Gangions or snoods are shorter leaders attached to that mainline. The baited hooks hang from those leaders.

 

The type of hook, bait, spacing, and fishing depth can change depending on the target species and fishery. For example, NOAA notes that pelagic longlines often use bait such as squid, mackerel, and sardines, and that hook types vary by species, with J-hooks and circle hooks commonly used.

 

Buoys, Weights, High Flyers, and Soak Time

 

Floats or buoys help suspend or mark the gear. High flyers are tall marker buoys that make the gear easier to locate. Weights may be used when the gear is meant to fish deeper or along the bottom.

 

Soak time is the amount of time the gear stays in the water before being hauled back. Pelagic sets can soak for hours, while bottom longlines may soak from hours to days depending on the fishery. NOAA states that bottom longline gear can have up to a thousand baited hooks and can soak anywhere from hours to days.

 

Pelagic Longlines vs. Bottom Longlines

 

The biggest difference is where the gear fishes.

 

Type	Where It Fishes	Common Targets	Basic Setup
Pelagic longlines	Suspended in the water column	Tuna, swordfish, billfish	Mainline supported by floats and marked by buoys
Bottom longlines	Weighted near the seafloor	Halibut, flounder, sole, sharks, groundfish	Mainline weighted down, with buoy lines and high flyers

 

Pelagic longline fishing is used in open water for fish that move through the water column, such as tuna and swordfish. Bottom longline fishing is used near the seafloor for species such as sharks, halibut, flounder, sole, and other groundfish. The NOAA Fisheries guide to bottom longlines explains that bottom longlines have a mainline weighted to the seafloor, with buoy lines marked by flags or high flyers.

 

What Fish Are Caught With Longline Fishing?

 

Longline fishing can target different species depending on the gear, region, bait, hook type, and fishing depth.

 

No matter the target, choosing high-performance ZeroDrk30 fishing gear ensures success, as pelagic longlines commonly target tuna, swordfish, and billfish. That does not mean every longline fishery targets every one of those species. Fishing rules, seasons, permits, and management plans vary.

 

For anglers, the key is simple: longline fishing is not one single setup. It is a method that can be adjusted for different fisheries, depths, and target species.

 

Why Commercial Fishermen Use Longlines

 

 

Commercial fishermen use longlines because they can cover large areas, fish specific depths, and target certain species at commercial scale. Compared with some less selective methods, longlines can be adjusted through hook type, bait choice, depth, spacing, and location.

 

That does not make the method perfect. It makes it powerful.

 

And powerful gear needs serious discipline. Longline fishing can be efficient, but it also requires management, monitoring, responsible handling, and clear regulations because the risks are real.

 

The Big Concern: Bycatch

 

Bycatch means marine life caught unintentionally while fishing for another species. In longline fishing, bycatch can include non-target fish, sharks, rays, sea turtles, marine mammals, and seabirds.

 

The NOAA Fisheries bycatch overview explains that bycatch includes animals fishermen do not want, cannot sell, or are not allowed to keep, including fish, marine mammals, sea turtles, and seabirds that become hooked or entangled in fishing gear. Understanding these challenges is why high-quality gear like theDRK Collection is developed to support responsible angling.

 

This is why longline fishing can be controversial. A baited hook does not know what is supposed to bite it. If the wrong animal takes the bait, gets hooked, or becomes tangled, the consequences can be serious.

 

That does not mean every longline fishery is careless. It does mean responsible management matters.

 

Can Longline Fishing Be Managed Responsibly?

 

Yes, longline fishing can be managed more responsibly, but it takes rules, enforcement, gear changes, and real commitment on the water.

 

Bycatch reduction can include circle hooks, bait choices, shorter soak times, limits on mainline length, monitoring, time and area closures, and safe handling and release protocols. NOAA also describes seabird mitigation tools such as weighted branchlines, tori lines, side-setting, night-setting, blue-dyed bait, and seabird handling practices. The NOAA Fisheries seabird mitigation overview gives a practical look at how these measures are used in Pacific Islands longline fisheries.

 

Sea turtle handling is another serious area. NOAA Fisheries issued updates to sea turtle safe handling and release requirements for Atlantic Highly Migratory Species pelagic and bottom longline fisheries, including clearer regulations and additional tools or options to help fishermen safely handle and release sea turtles. The NOAA Fisheries sea turtle safe release requirements explain those updates.

 

The balanced view is this: longline fishing is not automatically good or bad. The outcome depends on the fishery, the rules, the gear, the crew, the monitoring, and the willingness to reduce harm.

 

What Recreational Anglers Should Know

 

Longline fishing is not the same as rod-and-reel fishing. It is not trolling, either. Trolling usually means pulling bait or lures behind a moving boat with fishing rods or lines. Longline fishing uses a long mainline with many baited hooks set at intervals.

 

Can recreational anglers use longline gear? Regulations vary by location, species, water body, and gear type. Do not assume it is allowed. Check federal, state, and local rules before using any unfamiliar fishing method.

 

Foreveryday anglers, the value is not in copying commercial gear. The value is in understanding the language of fishing. When you know what pelagic longlines, bottom longlines, mainlines, gangions, snoods, soak time, bycatch, and circle hooks mean, you can read seafood labels, fishing news, regulations, and conservation debates with a sharper eye.

 

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What Anglers Should Remember

 

Know the gear. Respect the method. Fish smarter.

 

Longline fishing is a powerful commercial method, not a casual weekend shortcut. It can help supply seafood at scale, but it also comes with real bycatch concerns. Responsible fishing knowledge matters because the water connects everyone who uses it, from commercial crews to weekend anglers to families teaching kids their first cast.

 

That mindset fits ZeroDrk30, a brand that reflects these values in every apparel item, including our fishing hats and accessories: built on discipline, rooted in fishing culture, and focused on community over competition.

 

If you already create content around days like this on the water, the ZeroDrk30 Fishing Creator Program may be a natural next step.

 

FAQs About Longline Fishing

 

Is longline fishing legal in the United States?

 

Yes, longline fishing can be legal in the United States, but it is highly regulated. Rules depend on the fishery, region, species, permit, and gear type. Recreational anglers should never assume longline gear is allowed without checking federal, state, and local regulations.

 

Is longline fishing bad for the ocean?

 

Not automatically. Longline fishing can be efficient, but it can also create bycatch risks for sea turtles, marine mammals, seabirds, sharks, rays, and non-target fish. Whether it is managed responsibly depends on gear, regulations, monitoring, and handling practices.

 

What is the difference between pelagic and bottom longline fishing?

 

Pelagic longlines fish in the water column and commonly target species like tuna, swordfish, and billfish. Bottom longlines are weighted near the seafloor and may target halibut, flounder, sole, sharks, and other groundfish.

 

Is longline fishing the same as trolling?

 

No. Trolling usually involves pulling bait or lures behind a moving boat. Longline fishing sets a mainline with many baited hooks attached by gangions or snoods. It is a different fishing method with different gear and regulations.

 

Can recreational anglers use longline fishing gear?

 

It depends on the location and rules. Some areas may restrict or prohibit certain longline-style gear for recreational use. Always check the regulations before using gear beyond standard rod-and-reel setups.

 

What is bycatch in longline fishing?

 

Bycatch is the unintended catch of animals that were not the target. In longline fishing, this can include non-target fish, sea turtles, marine mammals, seabirds, sharks, and rays.

 

What fish are commonly caught with longlines?

 

Pelagic longlines commonly target tuna, swordfish, and billfish. Bottom longlines may target halibut, flounder, sole, sharks, and other groundfish, depending on the region and fishery.

 

How can longline fishing reduce harm to wildlife?

 

Bycatch reduction can include circle hooks, different bait choices, shorter soak times, line length limits, monitoring, seabird mitigation tools, time and area closures, and safe handling and release requirements.

 

Longline fishing is worth understanding before judging. It is efficient, complex, regulated, and capable of both feeding markets and creating serious bycatch concerns when handled poorly.

 

For anglers, the takeaway is not to endorse careless use or condemn every commercial crew. The takeaway is to stay informed. The more you understand fishing methods, the better you can respect the water, the gear, and the people who depend on both.

 

Subscribe to the ZeroDrk30 newsletter, because getting better on the water starts with clear, useful fishing knowledge. No pressure. Just practical fishing tips, gear notes, and ZeroDrk30 updates at your own pace.