# Asian Clam (*corbicula fluminea*) The Asian Clam (Corbicula fluminea) is a small but mighty freshwater bivalve that has made a massive impact on aquatic ecosystems worldwide. Originally native to eastern and southeastern Asia, this adaptable creature has become one of the most successful invasive aquatic species, spreading rapidly across the Americas, Europe, and Africa. Known for their prolific reproduction and hardy nature, Asian clams can quickly establish incredibly dense colonies, sometimes blanketing riverbeds in the thousands per square meter. While they are fascinating marvels of biological efficiency, their success often comes at a steep cost to native habitats, as they outcompete local mollusks for food and space. Spotting an Asian clam shell along a riverbank is a testament to the incredible resilience and widespread global journey of this highly effective filter feeder. - **Category:** [Invertebrate](https://www.snappit.app/explore/categories/invertebrate) - **Rarity:** Common - **Danger:** 1/5 · Very low - **Snaps:** 2 - **Habitat:** Found in freshwater rivers, lakes, and streams, often burrowed into sandy or gravelly substrates. ![Asian Clam](https://inaturalist-open-data.s3.amazonaws.com/photos/182703746/medium.jpg) Photo: anonymous, CC BY 4.0 · [iNaturalist](https://www.inaturalist.org/photos/182703746) ## Appearance The Asian clam features a sturdy, roughly triangular or rounded shell that typically measures less than 5 centimeters (2 inches) across. Its most distinctive visual hallmark is the presence of deep, evenly spaced, pronounced concentric ridges across the outer surface of its valves, which easily distinguish it from smoother native freshwater mussels. The shell's exterior color varies significantly depending on its environment, ranging from yellowish-green and light brown to deep olive or nearly black. Inside, the shell is smooth and polished, often exhibiting a striking pale blue, white, or subtle purple tint, particularly near the hinge area. ## Taxonomy - **Kingdom:** Animalia - **Phylum:** Mollusca - **Class:** Bivalvia - **Order:** Venerida - **Family:** Cyrenidae - **Genus:** Corbicula ## Interesting facts - Because they are simultaneous hermaphrodites, a single Asian clam can self-fertilize and release up to 35,000 juveniles in a single breeding season, essentially starting an invasion single-handedly. - In their native range across Asia, they are sometimes harvested for human consumption and used in traditional dishes or soups, despite their small size. - They are notorious 'biofoulers,' known to severely clog the water intake pipes of power plants and industrial facilities, costing millions of dollars in damages annually. - When disturbed or facing poor water quality, Asian clams will tightly shut their strongly ridged shells and can survive for weeks without drawing in fresh water. ## Special abilities - **Rapid Self-Fertilization:** As a simultaneous hermaphrodite, a single individual can self-fertilize to reproduce, meaning one clam alone can start a new colony in a new habitat. - **Pedal Feeding:** Before their gills are fully developed enough for filter feeding, juveniles use their muscular foot to sweep organic detritus and algae directly into their mantle cavity. - **Byssal Thread Anchoring:** Young Asian clams secrete sticky byssal threads that allow them to anchor securely to rocks, gravel, and submerged debris, preventing them from being swept away by strong currents. ## Measurements & details - **Length:** 1-5 cm - **Weight:** 0.001-0.02 kg - **Lifespan:** 1-7 years - **Clutch Size:** 10000-70000 - **Incubation:** 2-5 days ## Diet & Feeding Asian clams are highly efficient filter feeders that draw in surrounding water to extract suspended microscopic organic material. - **Age differences:** Juveniles rely on pedal feeding (using their foot to gather food from the sediment) until their gills fully develop to support filter feeding. - **Primary Foods:** Phytoplankton, Zooplankton, Organic detritus, Benthic diatoms - **Foraging Method:** Filtering ## Ecological connections - **Eaten by:** [Common Carp](https://www.snappit.app/explore/common-carp) (*Cyprinus carpio*) — Common carp forage heavily on bottom-dwelling invertebrates and frequently crush and eat Asian clams. - **Competitor:** [Zebra Mussel](https://www.snappit.app/explore/zebra-mussel) (*Dreissena polymorpha*) — Both are highly invasive filter feeders that intensely compete for space and suspended food particles in shared freshwater habitats. - **Eaten by:** [Raccoon](https://www.snappit.app/explore/raccoon) (*Procyon lotor*) — Raccoons forage along shallow shorelines and riverbanks, frequently digging up and eating Asian clams. ## Safety **Danger:** 1/5 · Very low No special safety notes yet. ## Frequently Asked Questions ### How to identify Asian Clam? Compare body symmetry, shells, segments, legs, tentacles and how the animal moves. Invertebrates span many unrelated groups, so start with body structure. Invertebrate Identifier: upload a photo and compare the visible details. ### How long is Asian Clam? 1-5 cm ### How much does Asian Clam weigh? 0.001-0.02 kg ### How long does Asian Clam live? 1-7 years ### What does Asian Clam eat? Asian clams are highly efficient filter feeders that draw in surrounding water to extract suspended microscopic organic material. ### Where is Asian Clam usually found? Found in freshwater rivers, lakes, and streams, often burrowed into sandy or gravelly substrates. ### How does Asian Clam hunt? Filtering ### How many eggs does Asian Clam lay? 10000-70000 ## Where to spot - [Kickapoo State Recreation Area](https://www.snappit.app/guides/places/kickapoo-state-recreation-area) — Illinois, US · State Park - [Robert Beaty Historic District](https://www.snappit.app/guides/places/robert-beaty-historic-district) — Alabama, US · Historic District - [Matthews Beach Park](https://www.snappit.app/guides/places/matthews-beach-park) — Washington, US · Park - [Blue Lake Regional Park](https://www.snappit.app/guides/places/blue-lake-regional-park) — Oregon, US · Park - [Madison Park](https://www.snappit.app/guides/places/madison-park) — Washington, US · Park - [Overbrook Park](https://www.snappit.app/guides/places/overbrook-park) — Florida, US · Park [View all places to see Asian Clam](https://www.snappit.app/guides/where-to-see/asian-clam) ## More Invertebrate - [Coral](https://www.snappit.app/explore/coral) - [Crab Spider](https://www.snappit.app/explore/crab-spider) (*Mecaphesa asperata*) - [Garden Spider](https://www.snappit.app/explore/garden-spider) (*Araneus diadematus*) - [Brown Recluse Spider](https://www.snappit.app/explore/brown-recluse-spider) (*Loxosceles reclusa*) --- Source: [Asian Clam: Characteristics, Facts & Places to See — Snappit](https://www.snappit.app/explore/asian-clam)