Solunar Theory: What Fishing Tables Can Tell You

John Alden Knight popularized solunar tables in the 1930s. They attach proposed activity windows to the moon's position. Major periods center on the moon being overhead or underfoot; minor periods center on moonrise or moonset. These names describe the theory, not a verified schedule of fish feeding.

Our tables display major windows of about two hours and minor windows of about one hour. Use the times for the fishing location rather than borrowing them from another town. A window may overlap darkness, closed access, or hours you cannot fish.

Start with a workable outing. If a window fits it, you can test that timing. If it does not, the table has not established that the remaining hours are unproductive.

Quigley and colleagues tested popular solunar predictions against 361 trout-fishing trips recorded by one angler around Utah. Daily solunar values, lunar phase, and illumination did not significantly predict catch per unit effort in that dataset. A single-angler study does not establish the result for every species and fishery.

Vinson and Angradi found a lunar pattern in a large muskellunge catch-record dataset. They also examined angler effort and could not attribute the pattern to fish behavior alone. That result is not proof that all fish feed on the same lunar schedule.

The practical distinction: a pattern in reported catches, a controlled measure of catch rate, and a proposed biological mechanism are different kinds of evidence.

Moonlight changes the setting of a night outing, but the research above does not justify sorting all species into full-moon sight feeders and new-moon scent feeders. Clouds, water clarity, artificial light, habitat, and the actual time the moon is above the horizon also matter to what you encounter.

On the coast, the sun and moon contribute to real tidal changes. NOAA explains that new and full moons tend to produce larger tidal ranges, and a nearby perigee can raise the range further. Local conditions still matter.

Check a local prediction and the observed current rather than assuming that a supermoon produces the strongest useful flow of the year or a guaranteed better bite.

These are model assumptions, not measured increases in fish feeding. At its base weight in our scoring engine, solunar is a small (3%) input rather than the primary signal. Our scoring engine assigns 100 to new/full moons and 50 to quarter moons on the moon-phase factor.

Our scoring adds up to 8 points at perigee, 12 when perigee falls on a new or full moon, and takes 5 away at apogee, all on the solunar factor. These are factor adjustments, not the same change in the overall grade.

In our scoring engine, solunar carries about 3 to 4% of the overall fishing score on a typical day, with seasonal and species adjustments that can push it to roughly 9%. Even at that ceiling, moon phase and distance, which is all the daily solunar factor reads, are about a tenth of the grade. The feeding windows only shape the hourly chart.

On our hourly chart a major period adds up to 8 points to an hour and a minor up to 4, scaled down when that hour's weather is poor, and a major period that lands on dawn or dusk adds up to 5 more as a convergence. None of it moves the daily grade.

For the factor definitions and limitations, follow the scoring-methodology link below.

1. Choose a species and a place you can fish.
2. Compare the local weather, water conditions, and available hours.
3. Use lunar timing to choose between otherwise suitable windows, rather than overriding access or conditions.
4. Keep a log of time fished, method, conditions, and fish caught, including trips with no catch.

Logging effort matters: more catches on a popular moon date can reflect more time spent fishing. Compare your own observations cautiously instead of treating one successful trip as proof of a universal rule.