Basic Profile

Origin
Subtidal mudflats off Korea's southern and south-western coasts; also Japan and China
Species
Ostrea denselamellosa (beotgul)
Classification
Wild
Farming Method
Mostly wild
Producer
Korean fishers
Visual Signature
Flat oyster

Ostrea denselamellosa, called beotgul in Korean, is a flat oyster of the subtidal mudflats off Korea's south and south-west coasts, and is also found in China and Japan, where it was first described.12

A shell of Ostrea denselamellosa in the Naturalis collection
A shell of Ostrea denselamellosa in the Naturalis collection. Photo: Naturalis Biodiversity Center / Wikimedia Commons (CC0)

A Species in Decline

It is a live-bearing flat oyster, brooding its young, and its natural populations have declined sharply.3 In Korea it spawns from May, when the water reaches about 16.7 °C, until September.1 In 2026 researchers reported Bonamia ostreae, the parasite that devastated Europe's flat oysters, in wild beotgul from Korea's west coast, probably a recent introduction through the movement of oysters.2 The European story is in the diseases that redrew the oyster map.

Flavor Breakdown

What's known
We found no published tasting study of the beotgul in English. As a flat oyster, expect firm meat and a mineral finish, like its European relatives.
When
Outside the May–September spawning season.1

What Makes Ostrea denselamellosa Unique

The beotgul is East Asia's counterpart to the European flat oyster: a brooding species in decline, now facing the same parasite that nearly wiped out Europe's flats.23

Korea's native flat oyster, scarce and in decline. If you find one in a Korean market in winter, try it.

Should You Add Lemon?

Cautiously

Try one plain first.

Pairing Guide

1
Soju

The Korean table's drink.

2
Junmai sake

Dry and savory.

OptimalPlain
AcceptableChogochujang
AvoidCocktail sauce

Who Is This For?

Will love it
  • Flat oyster collectors
  • Travelers in Korea
Sources
  1. Han, J. et al. (2022). Reproductive characteristics of the flat oyster Ostrea denselamellosa (Bivalvia, Ostreidae) found on the southern coast of South Korea. Journal of Marine Science and Engineering 10: 1326. doi.org/10.3390/jmse10091326
  2. Kim, S.H. et al. (2026). First report of Bonamia ostreae in wild flat oysters (Ostrea denselamellosa) from the west coast of Korea. Journal of Invertebrate Pathology. pubmed.ncbi.nlm.nih.gov
  3. Dong, Z. et al. (2023). A chromosome-level genome assembly of Ostrea denselamellosa provides initial insights into its evolution. Genomics. doi.org/10.1016/j.ygeno.2023.110582
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