Bait Additives and Liquid Attractants

By Alex Clayton · Updated 23 October 2026

Bait additives are liquids, oils and powders you add to hookbaits, pellets, groundbait or PVA to give them more smell and taste. They can help fish find a bait and accept it, especially when the fish cannot see it clearly. Laboratory studies support the idea, but they also show the response depends on the species and the concentration.

What the bottle labels leave out is that nobody appears to have published a field trial showing more fish on the bank with additives than without them. So this page sticks to what the research does show about liquid attractants, then covers oil versus water-based liquids, dosing, species and the bait rules.

What Bait Additives Are: Glugs, Dips, Oils and Powders

Any tackle-shop liquids shelf holds dozens of near-identical bottles with different names. The names matter less than you think, because brands use the terms loosely.

The main categories:

Glugs, dips and boosters: thick liquids for soaking or coating a hookbait. “Glug” is angler slang rather than a fixed product type.
Liquid attractants: thinner liquids for mixing into feed, groundbait or PVA bag contents.
Fish oils: oil-based liquids, often made from oily fish.
Bait flavours: concentrated scents, often sweet or fruity, used in small amounts.
Powders, sweeteners and amino-based additives: boosters mixed into pastes, groundbait or boilie mixes.

Read the label for what is in the bottle, not the name on the front.

Type	Base	Typical use
Glug or dip	Thick liquid, water or oil	Soaking or coating a single hookbait
Liquid attractant	Thin liquid	Mixed into pellets, particles or groundbait
Fish oil	Oil	Coating feed or deadbaits, PVA-friendly mixes
Flavour	Concentrated liquid	A few drops in paste, boilie or groundbait mixes
Powder or booster	Dry powder	Pastes, groundbait or boilie mixes

Anglers commonly add them to the hookbait, to loose feed such as pellets, to PVA bags, and to paste baits and homemade boilies at the mixing stage. That is common practice rather than proven effect, which is why the science is worth a look.

What Smell Attracts Fish? What the Research Actually Shows

In one laboratory study of Nile tilapia, fish spent about 4 to 8 seconds testing a pellet in the mouth before they swallowed it or spat it out. The same study found that the amino acids most attractive to one species can do nothing for another.

Smell finds the bait, taste decides

Fish use two separate senses on food. Smell (olfaction) picks up chemicals carried in the water and leads the fish towards the source. Taste (gustation) works at close range, through taste buds in the mouth, on the lips and, in many species, on the barbels and skin.

A review of fish taste research by Kasumyan (J Fish Biol, 2019) draws together four findings that apply to fish attractants:

Attractive food odours, such as water extracts of food, raise a fish’s motivation to feed.
A species’ taste preferences stay stable across many substances.
Starving fish lose their aversion to many deterrent substances and eat items they would normally refuse.
Food hardness can change the final decision to swallow or reject an item that otherwise tastes good, so texture counts alongside flavour.

Amino acids, and why one species is not another

The tilapia study (Levina and colleagues, J Fish Biol, 2021) compared taste responses across 19 species. Amino acid preferences were highly species-specific and not linked to whether a fish is a predator or a grazer. The most palatable amino acids also stopped working once diluted past a threshold: L-cysteine below 0.01 M and L-norvaline below 0.001 M.

A grass carp study (Yu and colleagues, Fish Physiol Biochem, 2021) found glycine, L-glutamic acid, L-arginine and DMT stimulated feeding, with a combined formula the most attractive. Grass carp are not the common carp in most UK lakes, so treat that as a clue rather than a recipe.

All three are laboratory studies. Research for this page found no published field trial comparing catch rates with and without additives, so the science explains why fish scents can work, and angler experience fills in the rest.

Oil-Based vs Water-Based Attractants

Ask one question of any bottle: does it mix with water or float on it? That answer tells you most of how it will behave in your swim.

Oil does not mix with water and is lighter than it, so oil-based liquids rise slowly and often show as a slick on the surface. Anglers use them for a slower, longer-lasting trail, often in colder water and at range. Water-based liquids disperse quickly, giving a strong but short-lived signal, and are more often used close in and in warmer water. Both are angler conventions, not study findings.

Amino-based liquids are a third group: feeding stimulants in lab tests, as covered above, but species-specific.

Type	How it disperses	Often used for	Watch out for
Oil-based and fish oils for fishing	Slowly, rising to the surface	Cold water, range, single hookbaits	Some fisheries restrict oils or oily baits, so check the venue rules
Water-based	Quickly, a short burst	Close range, warmer water, loose feed	Washes out fast
Amino-based	Depends on the base liquid	Feed and hookbaits	Species-specific response

For a single hookbait at range in winter, an oil-based glug is the usual pick. For a bag of pellets close in during summer, water-based liquid attractants do the job.

When Additives Help, and When They Are Not Worth It

The fish that needs the most persuading is not the hungry one. Kasumyan’s 2019 review found that starving fish drop their aversions and eat things they would normally refuse, so a fish feeding hard needs little help from bait additives.

Anglers widely hold that scent matters more wherever fish struggle to see the bait:

coloured water after rain
deep water
long range
low light at dawn, dusk and night

Temperature adds another layer. The same review found taste-cell turnover in fish depends strongly on water temperature. That shows cold water changes the fish’s taste system, not that any particular additive works better in winter. For season-by-season bait choice, see the seasonal bait guide.

Additives are usually wasted in clear, shallow water where fish can see the bait, and when fish are already feeding confidently. They cannot fix location either. No liquid catches fish from a swim they are not in, so time spent on watercraft and location usually pays more than another bottle. And a well-flavoured bait that is too hard or too soft can still be rejected at the last second.

Best for: cold, coloured or deep water, and single hookbaits at range.
Skip if: you are fishing clear shallows, the fish are feeding confidently, or you have not found the fish yet.

How Much to Use and How to Apply It

The bait smells wonderful to you, the fish ignore it, and the bucket smells of it for a week. Many anglers worry about overdosing on heavily fished waters.

There is no verified universal dose, and products vary widely in strength. Start with the manufacturer’s instructions for that bottle, then go lighter rather than heavier on pressured waters. The Levina study supports the logic: below a threshold an attractant stops working, so too little does nothing, but more is not automatically better.

Four common ways to apply bait additives:

Hookbait dip or glug: dip or soak the hookbait shortly before casting.
Coated feed: add the liquid to pellets or particles in a sealed tub, shake, and let it soak in.
PVA bags and sticks: add a little to the contents. Water dissolves PVA, so use PVA-friendly liquids, usually oil-based or labelled low-water. See the guide to PVA bag fishing.
Groundbait: mix it into the water you use to wet groundbait.

Note what you used, how much, and the conditions. Over a few sessions that tells you more about your water than any label.

New to additives? Buy one oil-based glug for hookbaits and one water-based liquid for feed, and learn those two before buying more. The bait hub covers the baits they go on, and the tackle section the kit.

Which Additives Suit Which Fish: Carp, Bream, Predators and Trout

As the Levina study showed, the response to taste cues is species-specific and not tied to whether a fish is a predator or a grazer. What works for carp is not a rule for every fish.

Carp

Glugs and bait flavours are most closely associated with carp fishing, where sweet, fruity and fishmeal families are all widely used. The grass carp lab findings do not transfer directly to the common and mirror carp most UK anglers target.

Bream

Bream are mostly caught on the feeder with pellets and groundbait, so liquids usually go into the feed rather than on the hook. Most of my own bream fishing on Windermere is on the feeder. The best bait for bream guide covers what to put on the hook.

Pike and perch

Sea deadbaits such as mackerel and sardine are naturally oily, and fish oils are a common addition when deadbaiting for pike. The pike deadbaiting guide covers the method. Under the national byelaws in England, crayfish must not be used as bait, dead or alive.

Trout

Some trout fisheries restrict baits and some are fly-only. Check the venue rules before you use any additive, and see the best bait for trout guide for what is usually allowed.

Garlic

Garlic fishing bait is a popular flavour in coarse and carp fishing. No study was found testing garlic on UK species, so treat any claim about it as angler opinion. If a flavour has not worked on your water after a few sessions, try a different family rather than more of the same.

Bait Rules: What the Law and Fisheries Allow

Two minutes reading the rules saves a wasted trip, or a ban from a fishery you like.

You need a rod licence to fish for freshwater fish in England and Wales from age 13, according to GOV.UK. The fishing licence guide has the details.

The Environment Agency’s national byelaws for England (GOV.UK, last updated 12 December 2023) set three bait rules:

Crayfish must not be used as bait, dead or alive.
Live bait is allowed only if the fish come from the water you are fishing, and some local byelaws forbid it.
Moving fish between waters needs written permission from the Environment Agency.

The national byelaws page does not mention additives or groundbait. Individual fisheries set any restrictions on oils, flavours, nuts, boilies or particles.

Scotland, Wales and Northern Ireland have their own rules: check with the Scottish Government or Fisheries Management Scotland, Natural Resources Wales, or DAERA or the Loughs Agency. Wherever you fish, check with the fishery before you travel.

Frequently asked questions

What is the best fishing attractant?

There is no single best fishing attractant. Lab research shows fish respond to taste cues in a species-specific way and that concentration matters. Amino-acid and food-derived liquids have the strongest lab support, so pick by species, water temperature and clarity rather than by brand.

Do fish oils work in cold water?

Fish oils are widely used in cold water because they disperse slowly and leave a longer trail. Research shows water temperature changes how fish taste cells renew, but no field trial proves oils catch more fish in winter. Treat them as a sensible option, not a guarantee.

Can I use additives on any fishery?

No national byelaw in England bans bait additives, but fisheries set their own bait rules. Some restrict oils or particles and some trout waters are fly-only. Check with the fishery before you travel.