The Fall Snook Run (Calba) on Costa Rica's Caribbean

Part of our complete guide: Fishing Costa Rica's Caribbean Coast: The Complete Guide

The short answer

Late every year, fat snook, which everyone on this coast calls calba (or calva), crowd into the mouths of the Caribbean's rivers and lagoons to spawn. Scientists put the spawning run at about October to January, and the writers and guides who fish it name about November to February as the season. Calba are small, usually 5 to 8 pounds, but they come in numbers, they're good on light tackle and they're good to eat.

There's a big catch, and it's the reason this article exists. At Barra del Colorado, the heart of the run, the river mouth and the inner lagoons are closed to calba from October 1 to January 31, and a 2026 study found the stock there overfished. Our complete guide to fishing the Caribbean coast gives the whole picture; here's what you need to know to fish the calba run legally and well.

What calba are

The fat snook (Centropomus parallelus) is a smaller, deeper-bodied cousin of the common snook, with the same sloping forehead, jutting lower jaw and black line along its side. FishBase lists a maximum of 72 centimeters and 5 kilograms, with a common length of about 25 centimeters. It lives in coastal water, estuaries and lagoons and runs up into fresh water, preferring water that's barely salty at all, and it spawns in brackish estuaries.

Two facts about its life explain both why the run happens and why it's fragile:

FECOP, the Costa Rican sport fishing federation, counts four snook species on the Caribbean side. Calba and the common snook are the two anglers come for; the swordspine snook is much smaller, with a FishBase maximum of about 36 centimeters. Our snook species guide covers the big common snook.

When the run happens

Sources describe the calba run in slightly different terms, depending on whether they're watching spawning fish or catches.

Put together, the fish arrive at the river mouths from about October, the angling run builds through November and December, and it fades by February. It also overlaps the wettest part of the year: Limón averages about 400 millimeters of rain in November and 445 in December, according to the national weather service, so expect muddy rivers and days when the sea keeps you inside.

Where the run goes

The ICE fish survey, citing the Costa Rican fish expert William Bussing, notes that calba are known for their end-of-year migrations in the Colorado, San Juan, Tortuguero and Parismina rivers, and that the runs there were once huge and an important source of income for local families. The Tico Times reported in 2005 that the fish showed first up the Tortuguero canal and then moved north into the backwaters and lagoons around Barra del Colorado.

The same survey adds a sobering note: local people told the researchers they hadn't seen those mass migrations for a long time.

Barra del Colorado

The biggest calba fishery on the coast, and the most tightly ruled. The river mouth and more than 20 inner lagoons are closed during the run (see the rules below). The main channel of the Río Colorado, Caño Bravo, part of Caño Penitencia, Samay Lagoon and Laguna Agua Dulce stay open all year except Tuesdays.

Tortuguero

The canal and river mouth by the village have a long calba history, but much of the area is Tortuguero National Park, and Costa Rica's fishing law (Ley 8436, article 9) bans sport fishing in national parks. The boundaries aren't marked on the water. Fish only with a licensed local guide who knows where fishing is allowed. The Manatus Hotel books trips with a local operator and gives September to December as its snook season.

Parismina

The Parismina river mouth, south of the national park, is a classic snook spot from a boat or the beach, and the IGFA all-tackle world record common snook was caught here in 1978. The Jalova mouth just north of the village, where the ICE survey found mature calba, is inside the park.

The rules for calba

This is where most visiting anglers get caught out. The detail below is from SINAC's January 2026 anglers' guide for the inland waters of the Barra del Colorado Wildlife Refuge, which SINAC and INCOPESCA manage under a joint fishing plan.

We read the river-mouth rule as closing the mouth to calba fishing for the whole run. Outside the refuge, there's no special calba rule that we could find, so the national rules apply: an INCOPESCA licence to fish from a boat (Ley 8436, article 75), up to 5 fish per trip for your own use (Decreto 36782, article 68), no selling your catch, and no fishing in national parks. Rules here change, so ask your lodge or guide what's open before you go, and see our fishing rules guide for the national picture.

Why the run needs a light touch

The 2026 study is the first assessment of the calba stock in Costa Rica. Researchers measured more than 2,200 calba landed at Barra del Colorado between 2019 and 2024 and found:

• Too much fishing. Fishing mortality was well above the levels the authors consider sustainable.
• Big females taken. Most of the catch was fish of about 45 centimeters, which are mostly females.
• Low spawning potential. The stock is producing well below the share of eggs a healthy fishery should.

The authors called the stock both overfished and still undergoing overfishing, most likely because so many large females are removed, and they noted that calba catches have fallen sharply over time. Their recommendations line up with SINAC's rules: a size window that lets more fish become females before they're caught, closed seasons and no-take zones where the fish gather to spawn, and gear that takes fewer of the biggest fish.

For a visiting angler, that means:

• Fish where it's open. Never fish a closed river mouth or lagoon during the run.
• Release the big ones. In the refuge, a calba over 60 centimeters must go back; it's a breeding female. Outside, do the same.
• Keep a few, not a cooler. If you keep one for dinner, keep it within the slot.

Our conservation guide has more on careful releases.

How to fish for calba

Calba fishing is light-tackle work, close to shore. Font described it as great light-tackle action, and FECOP talks about lots of snook on light tackle.

• Gear. A light to medium spinning rod and reel, enough to pull a 5 to 8-pound fish away from logs and roots.
• Lures. Small jigs are the classic calba lure, worked slowly near the bottom where the river meets the sea or along the edges of channels.
• Leader. Snook have sharp gill covers that can cut line, so a heavier fluorocarbon leader helps.
• Where. From a small boat at the river mouths and channels, or from the beach beside the mouths where that's allowed. The big common snook, fish of 35 pounds or more, also come off the beaches at the river mouths, FECOP says, so a heavier rod is worth having on hand.
• When. Guides judge the day by the bar, the rain and the colour of the water. After big rains, the rivers run brown and the fishing slows.

Our fishing techniques guide covers casting and jigging in more detail.

Planning a trip around the run

Because the run overlaps both the closures at Barra del Colorado and the wettest months, a calba trip needs more planning than a tarpon trip.

For freshwater snook in the north, our guide to Caño Negro and the Río Frío is the place to start. For the whole coast, go back to our complete Caribbean fishing guide.

Eating calba

FishBase notes that the flesh is well regarded, and the calba fishery has long been one of the most important on this coast. If you keep one within the rules, your lodge kitchen, or a village soda if you ask ahead, can often cook it. On the Caribbean, that often means fried whole and served with rice and beans cooked in coconut milk.