Predicting the Atlantic palolo worm hatch means lining up the right moon phase, a very low tide, and the time of day, because this brief spawning event in the Florida Keys triggers some of the best tarpon fishing of the year. In this How 2 Tuesday I break down how I forecast the worm hatch. The palolo worm lives in the coral and, on certain moon phases and tides, releases small three-to-four-inch worms that big migratory tarpon love. Hit it right and it is a magical, once-in-a-while event, whether or not you catch fish.
Listen now: press play in the player above and follow along.
It is a small, somewhat mysterious worm that lives in the coral in the Florida Keys and likely many other places in the Atlantic. The animal itself is actually fairly large, but at certain tide phases, moon phases, and times of year it breaks off a small three-to-four-inch segment as part of a spawning behavior. Those worms swim around in the water column, and one fish that loves to eat them more than almost anything is the tarpon. When the hatch lines up with the spring tarpon migration, it can produce extraordinary fishing.
It happens in the spring in the Florida Keys, timed to specific moon phases and tides rather than a fixed calendar date. I look for the new moon and the full moon, paired with a deep negative low tide falling close to sunset. As you move toward the June new moon the tides get especially low, often a negative 0.6 or lower, and I have seen worms on those tides at a range of times in the late afternoon and evening. It overlaps with the peak of the big tarpon migration, which is what makes it so special.
My recipe is a negative tide, ideally around negative 0.3 or lower, on a new or full moon, with that low tide landing close to sunset. The outgoing tide near sunset on the right moon phase seems to produce best. That said, I have seen hatches that do not fit the pattern, and I have been out on seemingly perfect conditions and seen nothing. It is a guide, not a guarantee. The point is to put yourself on the water when the odds are highest and be ready.
The productive spots are well known and easy to find. Bahia Honda Bridge has a tremendous worm hatch. The water off the front of Key West has a tremendous hatch, and many other places hold them too. In general you are looking for hard white bottom in an area that also holds a lot of tarpon. If you find that combination on the right tide and moon, you may get into a real show.
Because it lands at the time of year when there are more big migratory tarpon in the Florida Keys than any other, and the worms are a food source those fish key on hard. When everything lines up you can jump a lot of fish. Other times there can be so many worms in the water that the tarpon ignore your fly, much like a heavy trout hatch where the naturals outnumber your imitation. Even on those nights it is worth seeing for the sheer phenomenon of it.
No, and that is worth knowing going in. Sometimes you jump a lot of fish, and sometimes there are more worms than you want and the tarpon, though clearly feeding all around you, will not eat your fly. The hatch is not strongly condition-dependent. I have seen worms when it was blowing 25 and when it was slick calm, and I have struck out under what looked like perfect conditions. Even on a no-catch night, witnessing the hatch is a worthwhile, almost scientific experience.
What makes the palolo worm hatch special is timing. It happens right when the spring migration packs more big tarpon into the Florida Keys than any other time of year. So you have peak numbers of fish and a sudden, concentrated food source dropping into the water column at once. That combination is what turns a strange little spawning event into some of the best fishing of the season. I explain how the migration and the hatch overlap in the episode, so press play in the player above.
The frustrating side of the hatch is that more worms is not always better. On nights when the water is thick with naturals, the tarpon are eating everything around you and completely ignoring your fly, exactly like a heavy trout hatch where your imitation gets lost in the crowd. I have also struck out on conditions that looked perfect on paper. I get into how I read those nights, and why I still go, in the episode, so press play in the player above.
Here is the recipe I use to forecast the Atlantic palolo worm hatch and put myself on the water when it is most likely to happen.
I unpack each of these with the details and stories in the episode. Press play in the player above.
The reason I rushed this episode out is that the timing matters. As I recorded it, a full moon and a late-afternoon low tide were just a couple of days away, and I wanted anglers to have the recipe in hand before the window opened.
Remember that none of this is written in stone. I keep notes from years of hatches and they still surprise me. Use the moon, the tide, and the time of day to stack the odds, get out on that hard white bottom, and even if you do not jump a fish, seeing the palolo worm hatch in person is something every Keys angler should experience.
How 2 Tuesday is my weekly series where I break down one fishing skill at a time, from knots and casting to gear, tactics, and the habits that make you a better angler. Watch and listen to every How 2 Tuesday episode from Tom Rowland.
Atlantic palolo worm · tarpon · Florida Keys · Bahia Honda Bridge · Key West · new moon · full moon · negative tide · fly fishing · How 2 Tuesday · Saltwater Experience
I'm Tom Rowland, a professional fishing guide based in the Florida Keys, host of the Tom Rowland Podcast, and the longtime host of the Saltwater Experience television show. On the podcast's How 2 Tuesday series I break down one practical skill or lesson at a time, from fishing technique and gear to the habits that make you a better angler, in short, focused episodes you can put to use right away.
Subscribe to get the latest episodes, show notes, and exclusive content delivered straight to your inbox.