Solunar Fishing: What the Moon and Sun Actually Do to Your Bite

You Google "best time to fish" and right there in the search results is a little widget showing moon phases, major periods, minor periods, and a rating from "average" to "best." Looks official. Looks scientific. But here's the thing - solunar theory has been around for nearly a century, and the real data behind it is more interesting than most anglers realize. Especially when you stack it against 65 years of actual catch records.

What Is Solunar Theory?

In 1926, a fisherman and outdoor writer named John Alden Knight set out to figure out why fish sometimes fed like they were starving and other times ignored everything in the water. He studied old fishing folklore, interviewed guides, and identified 33 factors that might influence feeding activity. He eliminated them one by one until three remained: the sun, the moon, and tides. He combined "sol" and "lunar" and gave the theory its name.

The core idea is straightforward. The gravitational pull of the moon and sun creates predictable windows of increased fish activity throughout the day. Major periods happen when the moon is directly overhead or directly underfoot (on the opposite side of the earth) and typically last about 2 hours. Minor periods occur at moonrise and moonset and run about 1 hour each. These are the windows when fish are statistically most likely to feed aggressively.

Knight tested his theory against 200 record fish catches documented in Field & Stream and found that 90% were caught during the new moon phase. That number got people's attention. But anecdotes and record books are one thing. Long-term catch data is another.

65 Years of Marlin Catches and the Moon

Sam Mossman, a New Zealand fishing writer, did what most people only talk about. He pulled 65 years of catch records from the Bay of Islands Swordfish Club - the world's second-oldest game fishing club behind the Tuna Club of Avalon - and plotted more than 11,000 striped marlin captures against the 28-day lunar cycle. No cherry-picking. No selective sampling. Raw numbers from 1930 to 1995.

The trends were clear:

• Best single day: 3 days before the full moon (462 fish caught across those 65 years)
• Worst single day: the day after the full moon (315 fish)
• Catch rates declined from the last quarter to the new moon
• Catch rates increased after the full moon through the last quarter

That's a 47% difference between the best and worst days on the lunar calendar. Not dramatic enough to keep you off the water on a "bad" day - hot bites happened on every single phase at some point over those decades - but real enough to matter if you have the luxury of picking your days.

Ernest Hemingway noticed the same pattern fishing marlin off Cuba, writing that they "seem to feed best after the first quarter through to the full moon, and to drop off during the last quarter." Different ocean, different hemisphere. Same trend.

What Charter Captains Actually See

Four captains from four different fisheries weighed in for Marlin Magazine, and their answers show why solunar theory isn't a simple yes-or-no proposition.

Capt. Igor Assad out of Rio de Janeiro has been charting every single bite for years - logging wind speed, barometric pressure, sea state, water temp, and moon phase. His data says crescent moon periods produce the best blue marlin fishing in Brazil, with more bait visible on the surface and more aggressive feeding responses.

Capt. Chris Donato in Kona watches for the nine days leading up to the full moon. The mechanism: larger-than-normal tide fluctuations push nutrient-rich deep water toward the surface. Small organisms feed on the upwelled nutrients, baitfish stack up behind them, and apex predators like tuna and marlin follow the food chain to the top.

Capt. Brett Eller in Cabo has caught thousands of striped marlin across every moon phase. But during the waxing moon, billfish get noticeably more aggressive on trolled lures and live baits - enough that he plans his blue and black marlin season around it. If you're rigging a trolling spread during that window, an Epic Ballyhoo Pin Rig keeps your baits swimming clean at speed.

Then there's Capt. Tim Dean in Cairns, who put it plainly: "Granders aren't scared of any moon." On Australia's Great Barrier Reef, structure and current matter more than phase. The fish stack against the reef faces regardless. Four fisheries, four different answers.

Moon Phases, Tides, and Why Stripers Go Crazy

The connection between moon phase and fishing isn't mystical. It's mechanical, and striped bass are the poster child for the effect.

During full and new moons, the gravitational forces of the sun and moon align to create spring tides - the largest tidal swings of the month. Larger tides mean stronger currents. Stronger currents displace baitfish. And displaced bait means feeding opportunities for anything with fins and an appetite.

Stripers are built for this. Their broad, powerful tails let them cruise through heavy current while forage struggles against the flow. That predatory advantage is why the midsummer new moon around July 10-15 reliably produces some of the largest stripers of the year at Block Island, Montauk, and Boston Harbor. And it's why the full moon in late May through early June has near-mythical status up and down the Striper Coast - bigger tides, bigger bait movement, bigger fish on the prowl.

The same principle applies inshore. Redfish, flounder, and other structure-oriented species move with the tide. During spring tides around the full and new moon, water floods and drains flats more aggressively, flushing shrimp and crabs out of grass beds and right into ambush zones. For more on targeting these species after dark during peak solunar windows, check our night fishing guide.

How to Fish Solunar Periods

The practical application comes down to three things: timing your trip, matching your tackle to the conditions, and being on the water during the window - not rigging up while it passes.

Check a solunar table before you plan your trip. Google shows one right in search results when you type "solunar fishing" or "best fishing times today." Look for days where a major solunar period overlaps with a moving tide - incoming or outgoing, not slack. That overlap is your highest-probability window.

For surf fishing during strong moon tides, heavier terminal tackle keeps you in the zone. A 3 to 4 oz pyramid sinker holds bottom against the increased current, and 40 lb Diamond Illusion fluorocarbon handles the abrasion from a turbulent wash. Tie on an Eagle Claw L2004EL circle hook in 7/0 or 8/0, pin a chunk of bunker on it, and let the current carry the scent. During peak fall run moon tides, this setup accounts for a lot of big fish from the Outer Banks to the Cape.

Working a rip or current line from a boat? A 1 to 2 oz SPRO Prime Bucktail in white or chartreuse bounced along the bottom is deadly during peak solunar windows when stripers are actively hunting. Pair it with Epic Fishing Co. crane swivels for quick lure changes when the bite shifts. For jigging deeper structure during the major period, an AHI Diamond Jig in 2 to 4 oz drops fast and flutters on the retrieve - exactly the kind of erratic action that triggers reaction strikes in current.

Offshore, moon phase affects your trolling game too. During the waxing moon when billfish turn aggressive, push your spread with a Halco Roosta Popper on a short flat line and a Blue Water Candy Roscoe Meat Jig on the long rigger. Rig leaders with Momoi Hi-Catch mono in 80 to 130 lb and connect everything with Epic Fishing Co. ball bearing snap swivels - they handle the torque of a surface strike without binding.

During minor periods at moonrise and moonset, dial back the presentation. A Gotcha Plug worked fast through a school of surface-feeding fish produces strikes when bigger offerings get ignored.

The Honest Take

Not every experienced angler is fully on board. Matt Broderick, writing in The Fisherman, has "honestly never done very well on the actual moons" while surfcasting - though he's quick to note the days immediately before and after produce well. A Salt Strong guide goes further, calling tides "way more important" than solunar tables and recommending that anglers log their own catches against conditions rather than trusting any single predictor.

They're not wrong. Weather, water temperature, bait presence, and current all matter as much or more than moon phase on any given day. Solunar theory isn't a cheat code. It's one more edge in a game where small advantages compound over a season of fishing.

The old saying Sam Mossman closed his 65-year study with still holds: the best time to go fishing is when you can. But if you can pick your days, stack the solunar odds in your favor. The fish notice the moon even when you don't. Tight lines.

Got questions about timing your next trip or matching tackle to conditions? Give us a call at 888.453.3742 or drop a line to help@thetackleroom.com.