Does the Moon Affect Fishing?

By Alex Clayton · Updated 23 October 2026

Fishing apps and calendars rate every day by the moon, sometimes down to the hour. The rating looks precise. The evidence underneath it is much thinner.

The short answer: there is no single best moon phase for fishing that holds across UK waters. On the coast the moon matters through the tides it drives, with spring tides around the new and full moon. On lakes, ponds and non-tidal rivers there is no tide worth the name, and our research turned up no UK freshwater study, so the moon is a tie-breaker at most.

The steps below take you from what the moon physically does, through what the research shows, to how to use moon phase fishing data on the sea and inland.

Step 1: Know What the Moon Actually Changes (Tides, Light and Little Else)

One minute of astronomy tells you which moon claims can apply to your swim and which cannot.

The lunar cycle runs 29.5 days from new moon to new moon, while one orbit of the Earth takes 27.3 days, according to NASA. It passes through eight phases: new, waxing crescent, first quarter, waxing gibbous, full, waning gibbous, last quarter and waning crescent.

Phase, moonrise and moonset are exact astronomy, so a fishing moon calendar is accurate about the moon itself. The fishing predictions printed on top are the uncertain part.

Moon phase fishing claims come down to three mechanisms:

Tide: real and large on the coast. Springs and neaps follow the phases (Step 3).
Light: a full moon makes the night far brighter. That only matters after dark (Step 5).
Feeding cycles or “lunar rhythms”: claimed by solunar theory, with mixed evidence that is almost all marine (Step 2).

If you fish in daylight on a stillwater, two of those three barely touch you.

Step 2: Check What the Research Says Before You Trust a Moon Calendar

In one study of Gulf of Mexico reef fish, the moon mattered for only two species, and they peaked at opposite ends of the cycle.

That study is Pulver (2017), “Does the Lunar Cycle Affect Reef Fish Catch Rates?”, in the North American Journal of Fisheries Management. From commercial observer data, it found a lunar effect for red grouper (peak near new moon) and tilefish on bottom longline (peak near full moon). Yellowedge grouper, red snapper and vermilion snapper showed none. The moon is treated as one factor to adjust for, not a forecast.

A 2024 review by Andrzejaczek and colleagues covered 190 studies of tuna, billfish, sharks and rays. Per the NC Sea Grant summary, 51% found fish going deeper as moonlight increased and 5% shallower, and most sharks were more active near the full moon.

Both cover sea fish: commercial catches and ocean predators. Our research found no UK freshwater or recreational study of moon phase and catch rates, so there is no result for pike, perch, bream, carp or roach.

John Alden Knight devised solunar theory in the 1920s and 1930s, and its tables predict “major” and “minor” periods. No controlled test of the solunar tables UK apps publish turned up in the sources we checked, and different providers often disagree.

The evidence says “it depends on the species”. That is the opposite of a one-icon calendar.

Step 3: On the Coast, Plan by Spring and Neap Tides, Not the Moon Icon

You turn up on a full moon expecting a good session and find the tide racing too hard to hold bottom.

On the coast, the best moon phase for fishing is really a question about tide. Spring tides fall around the new and full moon, about twice a month. Neaps fall at the first and last quarter, roughly seven days after each spring. In the North Sea, tides lag the moon phase by about two days, so the biggest tides can arrive after the full or new moon.

Tide	What you get
Springs	Bigger range, stronger flow, more water movement and often more colour
Neaps	Gentler flow, easier to hold bottom and fish lighter leads

Which is better depends on the mark and species. Rather than reading the phase, check a tide table for your nearest port for times and heights, and check local safety advice before you fish rocks or estuaries. Our guide to tides for sea fishing covers reading the flow in more detail.

The same mark can fish hard and coloured on springs, then calm and clear on neaps.

Step 4: On Lakes and Rivers, Use the Moon as a Tie-Breaker

If even the Great Lakes barely have a tide, the moon is doing very little to the water in your local pond.

Lakes as large as Superior and Erie have lunar tides of only about 1 to 4 cm, and weather masks even that. It is a safe inference that UK lakes, ponds and rivers above the tidal limit have no tide worth worrying about.

So pick your day in this order:

Season and water temperature. These decide where fish are and how hard they feed.
The weather trend. Read up on how weather affects fishing, and on fishing in the rain if showers are forecast.
Time of day. Dawn and dusk are covered in the best time to go fishing.
Moon phase, last. Use it only to break a tie.

On Windermere, I choose pike, perch and bream days by the weather and the season long before I look at a fishing moon calendar.

Use the moon if you cannot choose between two days. Ignore it if it would talk you out of a good-weather day.

Step 5: Fishing at Night? Plan Around Moonlight, Not Moon Phase Folklore

A moon calendar is useful for one thing beyond doubt: telling you how dark the night will be.

Check the phase together with moonrise and moonset. A full moon that rises late still leaves the first hours of the night dark. Bright nights make it easier to see rod tips and the bank. Dark nights call for more headtorch discipline, so keep light off the water.

Full moon fishing advice often leans on findings like the marine review in Step 2, where many predators went deeper as moonlight rose. Those were tuna and sharks in the ocean. Fishing deeper water on bright nights is worth trying as an experiment, not following as a rule.

Check the fishery’s rules before you go, because not every water allows night fishing.

If you night fish, note how bright it was each session.

Step 6: Log the Moon Phase Alongside Your Catches

One blank on a “best” day proves nothing. Neither does one good session.

Each trip, note the date, moon phase, weather, water temperature or colour, when the bites came and what you caught. A notebook works, as does a catch log. After a season or more, check whether any moon pattern survives once weather and season are accounted for. That mirrors how Pulver handled it: the moon as one factor among several, not the headline.

Your own log, on your own water, beats any generic calendar.

Frequently asked questions

Is a full moon good for fishing?

Moon calendars and folklore often rate new and full moons highest, but the evidence is mixed and species-specific. In one marine study tilefish peaked near the full moon and red grouper near the new moon. On the coast a full moon brings spring tides; inland it mainly means a bright night. See Steps 3 and 5.

Do solunar tables work in the UK?

No controlled test of solunar tables turned up in the sources we checked, and tables from different providers often disagree. The theory dates from John Alden Knight's work in the 1920s and 1930s. Use them as a tie-breaker, never to override weather and season.

Does the moon affect freshwater fishing?

We found no evidence that it does in a way you can plan around. Even the Great Lakes have lunar tides of only about 1 to 4 cm, so UK stillwaters almost certainly have none worth noting. Any effect would come through light or behaviour, and that is unproven.

What is the best moon phase for sea fishing?

There is no single best phase. Spring tides, around the new and full moon and lagging by about two days in the North Sea, give stronger flow and a bigger range. Neaps give gentler water that is easier to fish light. Check a tide table for your nearest port.