Mangrove Snapper Spawn is On, Kids Had a Field Day

The mangrove snapper spawn is on.

Every year, between the July and August full moons, the mangroves pull out of the backcountry, the bridges, and the harbor pilings and slide out to the ocean side to spawn on the reef. It happens on the calendar. We’ve all figured that out by now, and so has every other boat with a chart plotter.

the first spot was already taken

Left the dock and pointed straight at the spot Captain Thomas had mentioned. Sure enough, when we came off plane, there was already a boat sitting on it. Fair game. He was there first.

Rather than crowd him or stare at his transom for an hour, we picked up and slid over to one of our usual yellowtail spots. It was only about a quarter mile away and it had been good to us before.

chum went out, fish came up

Dropped the hook and got the chum bag over. Tossed a few handfuls of oats in the water to sweeten the slick. Didn’t take long. The yellowtails came right up.

We caught a few good ones. The kids were bent up. Then the current switched on us and started pulling the slick back under the boat instead of trailing off the stern. When the chum goes under the hull, the fish come with it, and the bite dies right there under your feet. Happens all the time.

I looked back over at the mangrove spot Thomas had put us on. The other boat was pulling his hook. He’d gotten his fish and he was moving on.

slid over, and it was on

Pulled the anchor and eased over to the mangrove spot. Twenty-five feet of water. Nothing fancy.

The chum bag went out, and the fish came up almost immediately. Mangroves stacked up in the slick, right where they were supposed to be. That’s what a spawn pile looks like when you catch it right.

The kids were having a field day. Bent rods, screaming drag, mangroves flopping on the deck. That’s the whole reason you take a family out in July.

We ended up with plenty for lunch, wound in the lines, and headed back to the dock.

a word on the spawn, and on us

I want to say something here, because this part matters more than the fish story.

Mangrove snapper (the biologists call them gray snapper, Lutjanus griseus) live most of their lives inshore. They start their life in the seagrass and mangrove shorelines as juveniles, then move onto patch reefs and structure as they grow. They’re slow. A mangrove that’s pushing four or five pounds might be fifteen or twenty years old. That’s not a joke. That’s a fish that was swimming when the kids on my boat were in diapers.

Once a year, on the summer full moons, the mature ones stack up on the reef to spawn. Same reef spots, same lunar window, same fish. That’s a gift and a trap at the same time. It’s a gift because you can plan for it. It’s a trap because every boat that fishes the reef can plan for it too. Spawning aggregations are the easiest fish in the ocean to overfish. Nassau grouper are the cautionary tale nobody wants to become. Those aggregations got hammered for decades and they still haven’t come back.

Our mangrove population is in better shape than that, and I want to keep it that way. So here’s how we fish this stuff on the DirtyBoat when the spawn is on.

We keep what we’re actually going to eat. Not a limit for the picture. Not five per person because the state says we can. Enough for tonight’s dinner and maybe tomorrow’s sandwich, then we wind in.

We release the giants. The biggest fish in the pile is almost always a mature female, and a big female carries a lot more eggs than a small one. Killing her for a plaque or a Facebook photo is a bad trade. Let her go and she makes more mangroves for the next fifteen years.

We don’t grind the same spawn spot every trip. If we hit it hard on Monday, we go somewhere else Tuesday. Give the pile a breath. It’ll still be there next full moon if we let it.

We handle release fish right. Wet hands, quick unhook, straight back in the water. If a fish came up from real depth and is bloated, we vent or descend it. A released fish that floats off and dies is worse than a kept fish that fed a family.

Florida rules on mangroves are a 10 inch minimum size, 5 per person daily bag, inside the aggregate 10 snapper limit. Those are the legal floor. They are not a goal. On a spawn pile, the goal ought to be lower than the ceiling.

None of this makes you a worse captain. It makes the reef fish better next year, and the year after, and the year my kids bring their kids down to the boat.

the numbers

• Enough mangroves for lunch and then some, in 25 feet of water
• A handful of yellowtail from the first stop before the current turned on us
• Two spots, a quarter mile apart, both on the reef line
• One patient move. Waited out the other boat instead of crowding him
• Full moon week. July spawn window, ocean-side push
• A cooler with plenty in it. Not maxed out, and on purpose

the takeaway

The mangrove snapper spawn is a summer gift down here. Light seas, close water, and fish that want to eat. It doesn’t take a hero run to find them. It takes a chum bag, a bag of oats, and a little patience when the first spot is already taken.

Just remember what you’re fishing on. That pile of fish on the reef isn’t a coincidence. It’s a spawn. Take what you’re going to eat, let the big ones go, and give the spot a rest between trips. The reef gives back to the people who don’t take everything.

Want to get on the mangrove pile before the moon runs out? Book a DirtyBoat charter →