An Asian Clam along the Susquehanna River in Harford Co., Maryland (5/25/2013).

Asian Clam shells at Great Falls, Montgomery Co., Maryland (1/5/2013). Unfortunately, this non-native species has become established on the Potomac River.

Photo by Kerry Wixted MBP List

An Asian Clam in Charles Co., Maryland (9/21/2016). Measured 10 mm.

View Record Details Photo by Robert Aguilar, SERC MBP List

Asian Clam in Wicomico Co., Maryland (2/14/2017).

View Record Details Photo by Wayne Longbottom MBP List

An Asian Clam in Caroline Co., Maryland (3/4/2015).

View Record Details Photo by Robert Aguilar, SERC MBP List

Asian Clams in Garrett Co., Maryland (10/23/2019).

View Record Details Photo by William Blauvelt MBP List

Asian Clam in Washington Co., Maryland (3/14/2021). (c) Emilio Concari, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 349603 - Psn: 35)

Asian Clam in Washington Co., Maryland (3/14/2021). (c) Emilio Concari, some rights reserved (CC BY-NC).

View Record Details Photo by Emilio Concari MBP List

Asian Clam in Anne Arundel Co., Maryland (5/18/2016).

View Record Details Photo by Robert Aguilar, SERC MBP List

Asian Clam in Anne Arundel Co., Maryland (5/28/2020). (c) Izabella Farr, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 299431 - Psn: 55)

Asian Clam in Anne Arundel Co., Maryland (5/28/2020). (c) Izabella Farr, some rights reserved (CC BY-NC).

View Record Details Photo by Izabella Farr via iNaturalist MBP List

An Asian Clam in Howard Co., Maryland (4/26/2013).

Photo by Robert Aguilar, SERC MBP List

Asian Clam in Caroline Co., Maryland (2/19/2017).

View Record Details Photo by Wayne Longbottom MBP List

Asian Clam in Caroline Co., Maryland (2/19/2017).

View Record Details Photo by Wayne Longbottom MBP List

Asian Clam in Caroline Co., Maryland (3/18/2017).

View Record Details Photo by Wayne Longbottom MBP List

Asian Clam in Washington Co., Maryland (7/5/2016).

View Record Details Photo by Derek Hudgins MBP List

Asian Clam in Prince George's Co., Maryland (2/12/2018).

View Record Details Photo by Wayne Longbottom MBP List

An Asian Clam in Harford Co., Maryland (1/18/2018).

View Record Details Photo by Austin Jennings MBP List

Asian Clam in Howard Co., Maryland (1/14/2022). (c) Emilio Concari, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 510073 - Psn: 115)

Asian Clam in Howard Co., Maryland (1/14/2022). (c) Emilio Concari, some rights reserved (CC BY-NC).

View Record Details Photo by Emilio Concari MBP List

Asian Clams in Caroline Co., Maryland (2/16/2020).

View Record Details Photo by Sue Muller MBP List

Asian Clam in Montgomery Co., Maryland (3/3/2021). (c) coxfamilydc, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 345973 - Psn: 155)

Asian Clam in Montgomery Co., Maryland (3/3/2021). (c) coxfamilydc, some rights reserved (CC BY-NC).

View Record Details Photo by coxfamilydc via iNaturalist MBP List

Asian Clams in Montgomery Co., Maryland (4/2/2020).

View Record Details Photo by Sue Muller MBP List

Asian Clam in Frederick Co., Maryland (9/26/2025). (c) Sue Muller, some rights reserved (CC BY-NC)

View Record Details Photo by Sue Muller MBP List

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MBP marks as "Invasive" any taxon listed in the Maryland Invasive Species Council (MISC) list of Invasive Species of Concern in Maryland. You can read their criteria and review the lists here: https://mdinvasives.org/species-of-concern/. Use of media featured on Maryland Biodiversity Project is only permitted with express permission of the photographer.

An Asian Clam along the Susquehanna River in Harford Co., Maryland (5/25/2013). Media by Jim Brighton.

Asian Clam shells at Great Falls, Montgomery Co., Maryland (1/5/2013). Unfortunately, this non-native species has become established on the Potomac River. Media by Kerry Wixted.

An Asian Clam in Charles Co., Maryland (9/21/2016). Measured 10 mm. View Record Details Media by Robert Aguilar, SERC.

Asian Clam in Wicomico Co., Maryland (2/14/2017). View Record Details Media by Wayne Longbottom.

An Asian Clam in Caroline Co., Maryland (3/4/2015). View Record Details Media by Robert Aguilar, SERC.

Asian Clams in Garrett Co., Maryland (10/23/2019). View Record Details Media by William Blauvelt.

Asian Clam in Washington Co., Maryland (3/14/2021). (c) Emilio Concari, some rights reserved (CC BY-NC). View Record Details Media by Emilio Concari.

Asian Clam in Anne Arundel Co., Maryland (5/18/2016). View Record Details Media by Robert Aguilar, SERC.

Asian Clam in Anne Arundel Co., Maryland (5/28/2020). (c) Izabella Farr, some rights reserved (CC BY-NC). View Record Details Media by Izabella Farr via iNaturalist.

An Asian Clam in Howard Co., Maryland (4/26/2013). Media by Robert Aguilar, SERC.

Asian Clam in Caroline Co., Maryland (2/19/2017). View Record Details Media by Wayne Longbottom.

Asian Clam in Caroline Co., Maryland (3/18/2017). View Record Details Media by Wayne Longbottom.

Asian Clam in Washington Co., Maryland (7/5/2016). View Record Details Media by Derek Hudgins.

Asian Clam in Prince George's Co., Maryland (2/12/2018). View Record Details Media by Wayne Longbottom.

An Asian Clam in Harford Co., Maryland (1/18/2018). View Record Details Media by Austin Jennings.

Asian Clam in Howard Co., Maryland (1/14/2022). (c) Emilio Concari, some rights reserved (CC BY-NC). View Record Details Media by Emilio Concari.

Asian Clams in Caroline Co., Maryland (2/16/2020). View Record Details Media by Sue Muller.

Asian Clam in Montgomery Co., Maryland (3/3/2021). (c) coxfamilydc, some rights reserved (CC BY-NC). View Record Details Media by coxfamilydc via iNaturalist.

Asian Clams in Montgomery Co., Maryland (4/2/2020). View Record Details Media by Sue Muller.

Asian Clam in Frederick Co., Maryland (9/26/2025). (c) Sue Muller, some rights reserved (CC BY-NC) View Record Details Media by Sue Muller.