Palaemon varians, known as the Atlantic ditch shrimp[2] and variable shrimp,[3] is a caridean shrimp[1][3] found from the Baltic Sea and the British Isles to the western Mediterranean Sea.

[4] It reaches up to 5 cm (2.0 in) in length and is never found in fully marine conditions, instead living in brackish water.

[4] Sold by aquarium retailers as grass shrimp, they have a high tolerance of varying salinity[5] and temperature levels ranging from 1 °C to 30 °C for prolonged periods of time.

[3] They will feed on any leftover fish food, algae or plant life and are generally peaceful by nature when mixed with similar sized aquarium life.

This Caridea-related article is a stub.