Deep-drop fishing

Method · Last reviewed 2026-08-10

Fishing baits several hundred metres down with heavy weights and, usually, an electric reel — a method defined entirely by what depth does to everything else.

Safety

Boat safety — Can cause serious injury or death

This is offshore work in deep water, frequently a long way from help, with heavy equipment and long periods stationary. Weather deteriorating during a session is the ordinary risk; the boat being unable to move promptly while gear is down is the specific one.

What reduces it: Check the forecast for the whole window. Lifejackets worn. File a plan ashore. Carry communications that work beyond phone range. Be willing to cut away gear rather than stay on a mark.

Line under tension — Can cause injury needing treatment

Several hundred metres of braid under load with a multi-kilogram weight on the end. A parting line or a snagged trace released suddenly returns weight and hooks at speed, and hands in the line path during a powered retrieve are caught against the reel.

What reduces it: Keep hands clear of the line and of the reel's line path, particularly with an electric retrieve running. Never pull for a break by hand. Wear eye protection and keep others clear.

Barotrauma and pressure injury — Can cause serious injury or death

Fish brought up from these depths suffer catastrophic and irreversible barotrauma — swim bladder expansion, displaced eyes and gut. A deep-water fish cannot be returned successfully, so every fish brought up is effectively a fish taken.

What reduces it: Nothing reliably reverses it, which is why the decision has to move earlier. Decide what you will keep before dropping, stop when you have it, and do not fish for numbers on stocks that are frequently very slow-growing and long-lived.

Precautions that always apply here

Wear a buoyancy aid or lifejacket. Cold water incapacitates strong swimmers within a minute, long before swimming ability matters.
Tell somebody where you are going and when you expect to be back.
Carry a charged phone in a waterproof case, or another means of calling for help.

Deep-drop fishing is bottom fishing taken to depths where nothing about it works normally. Baits are lowered to two hundred metres and beyond, over structure located on a sounder, with weights measured in kilograms rather than ounces.

Everything difficult about it follows from depth. A drop takes several minutes each way, so a session consists of very few presentations and each one has to count. Line stretch and current mean the terminal tackle is rarely directly below the boat, and keeping it near-vertical is the whole craft. Bites are barely detectable through several hundred metres of line, which is why most practitioners use electric reels — not for the retrieve so much as for the ability to hold position and feel anything at all.

The fish are worth understanding before the method is. Deep-water species are typically very slow-growing, late-maturing and long-lived — some of the species taken this way live for over a century — and they suffer catastrophic barotrauma when brought up from depth. A deep-water fish cannot be released successfully in any meaningful sense: the swim bladder has expanded, the eyes and gut are displaced, and a descending device helps only sometimes and only from moderate depths.

That combination — long-lived fish, no viable release, and a method that reaches them — is why this record spends more space on what to take than on how to catch it.

What it is

Bottom fishing at depths beyond the practical reach of conventional tackle, generally from about two hundred metres downward, using heavy weights, multi-hook traces and usually an electric reel, over structure located with a sounder.

How it works

A heavy weight carries a multi-hook trace to the bottom, with the drop timed and the line watched to judge whether it is going down vertically or streaming away in current. Once down, the terminal tackle is held just off the bottom. Bites are frequently invisible and the first indication is weight on the retrieve. Electric reels do the recovery, which at these depths is otherwise a serious physical task repeated a handful of times a day. Lights on the trace are conventional, since there is no daylight at working depth.

What it is for

To reach species that live below the depth any conventional method can fish, over ground that can only be found electronically.

Setting it up

Weight for the depth AND the current. If the line is not near-vertical the trace is not where the sounder said, and at these depths there is no way to tell by feel.
Braid, because several hundred metres of stretch removes any prospect of feeling anything.
Know what you are dropping onto before you drop. A wasted descent costs ten minutes.
Decide what you will keep BEFORE the trace comes up. These fish cannot be released successfully, so the decision has to be made earlier than usual.
Watch the drift. A boat moving over uneven deep ground drags a heavy trace into it.

Advantages

Reaches species available to no other recreational method.
Very selective by depth and by ground — you are fishing a specific structure at a specific depth rather than a general area.
Excellent eating in most of the target species.
Electric reels make it accessible to people who could not physically fish these depths otherwise.

Limitations

Few presentations per session, so a bad decision costs a large share of the day.
Bite detection is poor to non-existent.
The target species are typically very long-lived and slow to replace.
Release is effectively impossible, which removes the usual way of correcting a mistake.
Tackle is specialised and expensive, and losses over deep structure are costly.

Conditions

Deep dropping needs a manageable drift and a sea state the boat can hold position in for the length of a drop. Strong current makes the line stream and defeats the method regardless of weight. It is a settled-conditions activity a long way offshore, so the binding constraint is usually the weather window rather than the fishing.

Common mistakes

Dropping without watching the line angle, and fishing somewhere other than the mark.
Under-weighting for the current.
Continuing to fish a spot after it has produced, on a stock that cannot absorb it.
Assuming a descending device makes release viable from these depths. It does not.
Treating the electric reel as the skill. The skill is knowing where and when to drop.

Where to go next

What it catches

What these connections rest on (7)

Practitioner consensus — 7 connections

Widely and independently recommended by experienced anglers and specialist sources. This is real angling knowledge, not proof: controlled evidence for it is limited, and FishingHQ records it as convention rather than as a demonstrated effect.

Atlantic goliath grouper
A practitioner claim about how Epinephelus itajara is commonly fished, following from where and how it feeds.
- General angling website restatements of established technique — Various (Credible secondary source)Relied on for: Widely restated practitioner accounts of fishing for goliath grouper.Citation checked — the work exists and is described correctly
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Practitioner treatment of the methods used for goliath grouper and comparable species.Citation checked — the work exists and is described correctly
Flapper skate
A statement about how a species is fished, which is angling convention rather than biology and is labelled as such.
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Contemporary UK sea angling practice as reported by practitioners, including ground, seasonal timing, bait and method convention.States this directlyCitation checked — the work exists and is described correctly
- General angling website restatements of established technique — Various (Credible secondary source)Relied on for: Widely restated descriptions of species behaviour and regional angling practice, recorded as consensus rather than as scholarship.Background and mechanism onlyCitation checked — the work exists and is described correctly
Hapuku
A practitioner claim about how Polyprion oxygeneios is commonly fished, following from where and how it feeds.
- General angling website restatements of established technique — Various (Credible secondary source)Relied on for: Widely restated practitioner accounts of fishing for hapuku.Citation checked — the work exists and is described correctly
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Practitioner treatment of the methods used for hapuku and comparable species.Citation checked — the work exists and is described correctly
Red emperor
A practitioner claim about how Lutjanus sebae is commonly fished, following from where and how it feeds.
- General angling website restatements of established technique — Various (Credible secondary source)Relied on for: Widely restated practitioner accounts of fishing for red emperor.Citation checked — the work exists and is described correctly
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Practitioner treatment of the methods used for red emperor and comparable species.Citation checked — the work exists and is described correctly
Spurdog
A statement about how a species is fished, which is angling convention rather than biology and is labelled as such.
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Contemporary UK sea angling practice as reported by practitioners, including ground, seasonal timing, bait and method convention.States this directlyCitation checked — the work exists and is described correctly
- General angling website restatements of established technique — Various (Credible secondary source)Relied on for: Widely restated descriptions of species behaviour and regional angling practice, recorded as consensus rather than as scholarship.Background and mechanism onlyCitation checked — the work exists and is described correctly
Swordfish
A practitioner claim about how Xiphias gladius is commonly fished, following from where and how it feeds.
- General angling website restatements of established technique — Various (Credible secondary source)Relied on for: Widely restated practitioner accounts of fishing for swordfish.Citation checked — the work exists and is described correctly
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Practitioner treatment of the methods used for swordfish and comparable species.Citation checked — the work exists and is described correctly
Yelloweye rockfish
A practitioner claim about how Sebastes ruberrimus is commonly fished, following from where and how it feeds.
- General angling website restatements of established technique — Various (Credible secondary source)Relied on for: Widely restated practitioner accounts of fishing for yelloweye rockfish.Citation checked — the work exists and is described correctly
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Practitioner treatment of the methods used for yelloweye rockfish and comparable species.Citation checked — the work exists and is described correctly

Related techniques

Sea fishingBottom fishing at depths where nothing works normally — few presentations, no bite detection, and fish that cannot be released successfully.

What these connections rest on (1)

Practitioner consensus — 1 connection

Sea fishing
The definitional relationship, framed by the constraint that actually defines it.
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Practitioner treatment of deep-water bottom fishing technique and tackle.Citation checked — the work exists and is described correctly
- IGFA International Angling Rules and World Record Requirements — International Game Fish Association (Angling or fisheries organisation)Relied on for: That powered and electric reels are recognised within the angling rule framework.Passage read and verified

What you fish it with

Multiplier and baitcasting reelsVery deep water means a great deal of line under load, which is a line-capacity and a drag problem before it is anything else.

What these connections rest on (1)

Practitioner consensus — 1 connection

Multiplier and baitcasting reels
That a practice conventionally depends on a piece of equipment, drawn from published description of practice rather than from testing.
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Long-running published description of British sea angling practice, including reels, casting, rough-ground technique and terminal arrangement.FishingHQ's interpretation of what it saysCitation checked — the work exists and is described correctly
- General angling website restatements of established technique — Various (Credible secondary source)Relied on for: Widely restated descriptions of equipment convention and its use, recorded as practitioner consensus rather than as scholarship.Background and mechanism onlyCitation checked — the work exists and is described correctly

Skills behind it

What these connections rest on (4)

Practitioner consensus — 1 connection

Depth as an environmental variable
A method-to-mechanism claim at practitioner level.
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Practitioner treatment of locating and fishing deep offshore structure.Citation checked — the work exists and is described correctly
- FAO fishing gear types and fishing technology information — Food and Agriculture Organization of the United Nations (Scientific institute)Relied on for: The classification of deep-set line gear and the depths it operates at.Citation checked — the work exists and is described correctly

Scientific evidence — 3 connections

Supported by peer-reviewed research or fisheries science. The sources are listed and can be checked.

Swim bladders, buoyancy and barotrauma
Deep-drop fishing makes barotrauma unavoidable and release conditional.
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Species and habitat data underlying this connection. Deep-drop fishing makes barotrauma unavoidable and release conditional.States this directlyPassage read and verified
Thermoclines and stratification
A link from a practice, an environment or a geography to the mechanism it rests on. It asserts that the mechanism is load-bearing here rather than merely relevant, which is the test applied throughout this file.
- ICES Advice on fishing opportunities, catch and effort — International Council for the Exploration of the Sea (Scientific institute)Relied on for: Hydrography, stratification, salinity structure and stock distribution across the European sea areas assessed, which is the physical basis for the mechanism named.States this directlyCitation checked — the work exists and is described correctly
- NOAA National Ocean Service education on estuaries and the National Estuarine Research Reserve System — National Oceanic and Atmospheric Administration, United States (Government fisheries body)Relied on for: Estuarine and coastal process: salt wedges, stratification, tidal exchange and the way water of different densities behaves where it meets.States this directlyCitation checked — the work exists and is described correctly
What actually happens to a released fish
A release-survival claim held to a scientific standard, because it is the reason this record's conservation section exists.
- Understanding the Complexity of Catch-and-Release in Recreational Fishing — Reviews in Fisheries Science 15:75–167, 2007 (Scientific literature)Relied on for: That release survival depends on the physical trauma of capture, and that barotrauma is a principal cause of post-release mortality.States this directlyCitation checked — the work exists and is described correctly
- Good Fish Guide — Marine Conservation Society (Conservation authority)Relied on for: That longevity and late maturity are material to whether a stock can sustain harvest.States this directlyCitation checked — the work exists and is described correctly

Check the rules before you fish

Fishing laws, bylaws, access rules, seasons, bait restrictions and permitted methods vary by location and can change. Check the current rules from the relevant authority and the water you intend to fish before fishing.

Check with:

Current national or regional law for where you are fishing
Current local bylaws
The relevant fisheries authority
The landowner, club or fishery whose water it is
Any restrictions specific to the species or the method you intend to use

Sources for this page

Understanding the Complexity of Catch-and-Release in Recreational Fishing — Reviews in Fisheries Science 15:75–167, 2007 (Scientific literature)Relied on for: That release survival depends on the physical trauma of capture, and that barotrauma from depth is a principal cause of post-release mortality.States this directlyCitation checked — the work exists and is described correctly
Good Fish Guide — Marine Conservation Society (Conservation authority)Relied on for: That longevity and late maturity are material to whether a stock can sustain harvest, which applies with particular force to deep-water species.States this directlyCitation checked — the work exists and is described correctly

How FishingHQ labels evidence is explained in the evidence policy.

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