BIOTIC Species Information for Jassa falcata
Researched byJacqueline Hill Data supplied byMarLIN
Refereed byProf. P. Geoff Moore
Distribution and Habitat
Distribution in Britain & IrelandFound on all British coasts. Reported from several sites around the coast of Ireland.
Global distributionCosmopolitan in temperate and warm-temperate waters; widespread and frequently recorded in Atlantic, Pacific and Indian Oceans, both north and south of the equator. Reported from most coastal regions of North East Atlantic, and often locally abundant.
Biogeographic rangeNot researched Depth rangeLower eulittoral to 5 m
MigratoryNon-migratory / Resident   
Distribution Additional InformationThis species is an important fouling organism. The animals construct tubes from pieces of debris and sediment cemented together, often forming dense mats, particularly in warm water discharge pipes from power stations (Fish & Fish, 1996).

Reported to depths of 5m in Japan (Kamenskaya, 1977). Jassa falcata is often found inhabiting Laminaria holdfasts and so may be found at the greater depths inhabited by some kelps.
Jassa falcata appears to be out-competed by Parajassa pelagica or unable to survive in very strong wave action at shallow depths (K. Hiscock personal communication).

Substratum preferencesOther species (see additional information)
Artificial (e.g. metal/wood/concrete)
Physiographic preferencesOpen coast
Strait / sound
Enclosed coast / Embayment
Biological zoneLower Eulittoral
Sublittoral Fringe
Upper Infralittoral
Wave exposureVery Exposed
Moderately Exposed
Tidal stream strength/Water flowStrong (3-6 kn)
Moderately Strong (1-3 kn)
SalinityFull (30-40 psu)
Habitat Preferences Additional Information
Distribution References Hayward & Ryland, 1995b, Lincoln, 1979, Picton & Costello, 1998, Costello et al., 1989,
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