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What is cua huynh de and when is it in season?

Published · 4 min read
Quick Answer

Cua huynh de (Ranina ranina, red frog crab) is a flat, bright-red crab off Phu Yen and Khanh Hoa. Season: December to May, peak April. Price: 1,150,000–1,200,000 VND/kg standard; mini 500,000–600,000 VND/kg. Best steamed with beer or lemongrass. Outside season (June–November), skip it — likely frozen.

VERIFIED · MAY 2026 Read below ↓

Cua huynh de is one of those regional specialties that requires being in the right place at the right time. Wrong season: frozen and not worth it. Wrong province: rarely available. Right season in Phu Yen: one of the most distinctive seafood experiences in Vietnam.

What it is

Cua huynh de (Ranina ranina) is a flat-bodied, bright red crab with paddle-shaped legs adapted for burrowing in sandy seabeds. It’s found in clean-water coastal zones from Quang Ngai south through Phu Yen and Khanh Hoa. It’s not farmed — it’s caught by fishermen who know the sandy offshore grounds where it feeds.

The red color is natural, not from cooking — the shell is already vivid orange-red when the crab is alive. The color intensifies slightly when steamed.

Season

In season: December through May. Fishing activity peaks in March and April, when catches are largest and the crabs are at their fattest.

Off season: June through November. Volume drops sharply. Restaurants that keep cua huynh de on their menu outside this window are almost certainly serving frozen crab — the texture and flavor are noticeably different.

If you arrive in July and see it on a menu, ask whether it’s fresh or frozen (tuoi hay dong lanh). Most honest restaurants will tell you.

Price

As of 2025/2026:

  • Standard size (3–5 crabs per kg): 1,150,000–1,200,000 VND/kg
  • Mini crabs (7–10 per kg): 500,000–600,000 VND/kg

One crab typically weighs 500–800 grams. Expect to pay 600,000–960,000 VND per crab at in-season prices.

Preparation

Hap bia (beer steam): The classic. The crab is steamed over beer with ginger, lemongrass, and sometimes chili. The beer steam keeps the meat moist and adds a faint malty note to the shell. Served whole, cracked at the table or by the kitchen on request.

Hap sa (lemongrass steam): Similar to above but with heavier lemongrass flavor. Lighter taste than beer steam.

Avoid deep-fried preparations — the delicate meat dries out quickly at high heat.

Where to find it

In season, most seafood restaurants in Tuy Hoa offer cua huynh de. The restaurants near Dong Tac pier and at Dam O Loan tend to have the freshest supply — they’re closest to the boats bringing it in. At O Loan lagoon restaurants, it occasionally appears alongside the oysters and clams.

Also asked

Related questions, answered.

What does cua huynh de look like?
Cua huynh de looks nothing like standard crabs. The shell is bright red-orange even before cooking (the color intensifies slightly when steamed), flat rather than round, and roughly 15–25cm across. The legs are flattened and paddle-shaped — adapted for burrowing in sandy seabed. The claws are smaller than standard crab claws relative to body size. The Vietnamese name translates roughly as 'emperor crab'; the English common names are red frog crab or spanner crab.
How should I eat cua huynh de?
Steam it — hap bia (steamed with beer, ginger, and lemongrass) is the classic preparation. The meat is sweeter and more delicate than mud crab or flower crab. Don't deep-fry it; the meat dries out. The best parts are the body cavity meat and the roe (if present in female crabs). It's typically served whole; ask the restaurant to crack the shell before serving if you prefer.
Is it worth the price?
At 1,100,000–1,200,000 VND/kg, one crab (typically 500–800 grams) costs 550,000–960,000 VND. That's a significant meal cost for Phu Yen. Whether it's worth it depends on your interest in regional seafood. The flavor is genuinely distinctive — lighter and sweeter than standard crab, with the fresh minerality of a well-maintained fishery. If you're traveling in December to April and this is your only chance to try it, yes.
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