Diwal: Hunting Iloilo’s Angel Wing Clam, and Knowing When Not To
Diwal, the angel wing clam, is the most expensive shellfish in Western Visayas and the hardest to find. What it is, when it is actually in season, what it costs, and where to eat it in Iloilo.
The Ilonggo name for it is not flattering. Diwál means a tongue hanging out, the way a dog pants in the heat. Open one of these shells and the reason is obvious: a long pale siphon lolls past the edge, too big for the box it came in, faintly obscene. Somewhere along the way an English speaker looked at the same animal, saw only the two thin white valves spread flat, and called it an angel wing.
Both names are accurate. Only one of them is about the living thing.
Diwal is the most expensive shellfish on a Western Visayas menu and the hardest to actually find. It cannot be farmed at scale. It is dived, by hand, out of clay and silt at river mouths, and it has been fished to local collapse at least twice in living memory. In July 2025 one Capiz town banned it outright. In May 2026 the same town let the season open again, under quota. This is not a delicacy with a stable supply. It is a delicacy with a management plan.
What diwal actually is
Pholas orientalis, a piddock, a boring clam in the literal sense: it burrows. Mature shells run roughly 8 to 22 centimeters, chalk white, ridged like a rasp, thin enough to feel breakable in the hand. They sit deep in soft estuarine bottom where fresh water meets salt, which is why divers go down 20 to 25 feet for them rather than gleaning them off a tidal flat.
One correction worth making early, because half the English-language internet gets it wrong. The angel wing of Florida and the Gulf of Mexico is Cyrtopleura costata, a different animal in a different ocean. Diwal is the Pacific one. If a page shows a Gulf clam and calls it diwal, it was written from a search result and not from a table.
The taste is the part people struggle to describe. The closest anyone has come is oyster crossed with squid, and that is right: the sweetness and minerality of a good oyster, then a firm snap as the siphon gives. It is sweet rather than briny. Next to it, talaba tastes like the sea and diwal tastes like something that lives under it.
A clam that has collapsed twice, and nearly a third time
Commercial gathering started in the 1970s. Demand climbed through the 1980s and the volumes crashed in 1987. By the mid-1990s diwal was scarce across its traditional grounds, and by 2003 it had disappeared entirely from Barotac Nuevo in Iloilo and from Ivisan, Pontevedra and Panay in Capiz.
Roxas City, which brands itself the Seafood Capital of the Philippines and treats diwal as the proof, started a rehabilitation program in 1997: a four-year moratorium and a shellfish reservation zone. The fishery reopened in 2004 at 15 tons. In 2005 it hit 65 tons. Then it was suspended again in 2007 and 2008, because the stocks had gone again.
What finally worked was blunt. In 2006 the city sank roughly 3,080 concrete jackstones, the four-pointed shapes used in breakwaters, onto the breeding grounds at about a thousand pesos each. Trawl nets snag on them and tear. There is, at this moment, an invisible field of concrete stars on the seabed off Capiz, put there to protect a clam. Another 560 were being built in Barangay Cogon as recently as February 2023. Between July 2009 and December 2010 a five-hectare area produced 300 tons.
The science ran alongside it. Dr. Liberato Laureta of the University of the Philippines Visayas led the Roxas research from 1997. Jesse Ronquillo and Robert McKinley published a working hatchery and larval protocol in Aquaculture in 2006, describing a population “rapidly vanishing in the Philippine islands of Panay and Negros.” Their reintroduced postlarvae colonised a cove at San Dionisio, Iloilo, within twelve months. That hatchery work never scaled commercially. Every diwal on every plate in Western Visayas is still wild and still dived.
And it is still fragile. On 4 July 2025 the new mayor of Panay, Capiz, Jonathan Besa, issued Executive Order No. 1: a total prohibition on harvesting diwal in the town’s municipal waters, by any method, in any quantity, for any purpose, enforced by the PNP Maritime Group alongside Bantay Dagat. His stated reason was short. “I want equity, justice and fairness in my area of responsibility.” The season reopened on 30 May 2026 under a regulated buying system.
Which means the honest description is not that diwal recovered. It is that diwal keeps being rescued.
When diwal is in season
There is no national closed season for diwal and no single BFAR order covering the species. Management is municipal, town by town, and the calendars genuinely differ. That is the single most useful thing to understand before planning a meal around it.
| Where | Season |
|---|---|
| Roxas City, Capiz | Roughly July to October, peaking July to September |
| Panay, Capiz | Reopened 30 May 2026 under quota |
| Valladolid, Negros Occidental | January to April, permit required |
Iloilo City eats mostly from the Panay side, so the practical window for a visitor is roughly June through October. Weather closes it independently of the calendar, because it is a dive fishery and nobody goes down in a bad swell. In September 2025 the mayor of Roxas City stood up at a Department of Science and Technology event, with the Secretary in the room, and explained the absence of diwal from the buffet by redefining the acronym: “DOST. Diwal is Off Season Today.” The room laughed because everyone there already knew.
The correct move is to phone the restaurant the same day. Not the day before. Reviews of Iloilo seafood houses split neatly into people who got diwal and people who arrived hopeful in the wrong month.
What diwal costs
When the Panay season opened on 30 May 2026, the town set the landed price at ₱400 per kilo for personal consumption and ₱350 for merchants, with resellers capped at 20 kilos per transaction. That is the price at the point of landing in Capiz, not on a plate in Iloilo City, and restaurant pricing runs well above it.
For context on the trajectory: ₱180 a kilo roadside in 2009, ₱150 to ₱300 in season in 2012 against ₱800 to ₱1,000 out of season, ₱300 to ₱350 at the Valladolid harvest in 2022. The off-season premium is the number that matters, and not for the reason most people assume.
How Iloilo cooks it
Steamed, with tanglad and luy-a, lemongrass and ginger, and nothing else. The shells gape, the siphons relax, and the liquor that collects in the bottom shell is the best part of the dish. This is the default and the one to order first.
Sinabawan nga diwal, in clear broth with tomato, onion and spring onion, soured and served scalding. Ilonggo clear soups are traditionally soured with batwan, the local Garcinia fruit that also carries KBL and kansi, though kitchens substitute tamarind or green mango depending on the day. Worth asking which, because batwan is the answer that tells you the kitchen is Ilonggo rather than merely in Iloilo.
Inihaw, grilled over charcoal until the shell opens and the edges of the meat brown, eaten with toyo and calamansi. Baked, with butter, garlic and cheese, which is what happens to every good shellfish in a Philippine restaurant eventually. And kinilaw, the Negros treatment, raw in vinegar with ginger, onion and chili.
The traditional pairing is laswa, the plain Ilonggo vegetable soup. Rich shellfish, clean vegetables, no competition between them.
Where to eat diwal in Iloilo
Breakthrough Restaurant, on the beach at Sto. Niño, Villa Arevalo, is the answer most Ilonggos give and the one the record supports. It runs live tanks, it has served sinabawan and grilled diwal for at least fifteen years, and recent reviews confirm both that the steamed diwal is worth the trip and that it is frequently unavailable. Open daily, roughly 10:00 to 21:00. Order the imbao, the mangrove clam, as insurance on a day the diwal has not come in.
Stanley Talabahan, built on stilts over the water a short walk along the same Villa Beach strip, is the oyster specialist. Doing both in one afternoon, talaba there and diwal next door, is the most efficient version of this meal.
Tatoy’s Manokan and Seafoods, also in Villa Arevalo, is the name every guide reaches for. It is genuinely still operating and genuinely excellent, but its documented shellfish are oysters, scallops and clams, and its actual fame is native lechon manok. No source confirms diwal on the menu. Call before making it the plan.
For the source rather than the destination, BR’s Grill in Roxas City was serving grilled diwal by the order in 2017, and Capiz is a straightforward land trip across Panay. Eating it within sight of the water it was dived from is a different meal.
Eating it without making the problem worse
Diwal is not on the IUCN Red List. It is not illegal to eat and there is nothing virtuous about refusing it. What it is, is a wild fishery that has crashed twice and is currently held up by concrete, patrol boats and municipal ordinances.
- Eat it in season, from a managed fishery. Panay reopened under quota in May 2026 precisely so this is possible.
- Do not chase it out of season. The off-season price has historically hit ₱1,000 a kilo, and that premium is the exact incentive that funds poaching. Declining to pay it is the single most useful thing a diner does here.
- Look at the size. Valladolid has enforced a three-inch minimum. Small diwal on a plate means somebody skipped a rule.
- Ask where it came from. Iloilo City sits between two managed fisheries and its diwal arrives by truck from Capiz or by boat from Negros. A kitchen that can answer diin naghalin ni? is a kitchen paying attention.
Frequently asked questions
What is diwal in English?
Angel wing clam, specifically the Pacific angelwing, Pholas orientalis. It is not the Atlantic angel wing, Cyrtopleura costata, which is a different species found off Florida and the Gulf of Mexico.
What does diwal taste like?
Sweet rather than salty, with the mineral quality of an oyster and the firm snap of squid. The meat is a long siphon rather than a small nugget, so the texture is closer to a scallop’s than a clam’s.
Why is diwal so expensive?
It cannot be farmed commercially, it is dived by hand from deep estuarine mud, the season is short, and it is legally restricted in several towns. Landed price in Panay, Capiz was set at ₱400 per kilo when the season opened on 30 May 2026.
Is diwal endangered?
Not in the formal sense. There is no IUCN assessment for the species. Scientists have described it as vanishing locally, and individual municipalities in Capiz and Negros Occidental manage it with closed seasons, quotas and size limits after repeated local collapses.
When is diwal season in Iloilo?
Iloilo City is supplied mainly from Capiz, where the window runs roughly June to October and peaks July to September. Negros Occidental runs January to April. Weather closes the dive fishery regardless of the calendar, so confirm by phone on the day.
What is the difference between diwal and talaba?
Talaba is an oyster, farmed on stakes and ropes, available year round and cheap. Diwal is a wild-dived burrowing clam, seasonal, restricted and roughly ten times the price. They are eaten in the same restaurants and belong to different economies.
More from Iloilo and Panay: Talaba, Pancit molo, the Molo district guide, Breakthrough Restaurant, Theo’s Restaurant and Bakery, the Paraw Regatta off the same Villa Arevalo shoreline, Miagao Church, and the Guimaras Island guide for the crossing.
Prices, seasons and restaurant details checked in August 2026. Diwal availability changes weekly. Call ahead.
