Where has the Bay barnacle been recorded?

Amphibalanus improvisus occurrence evidence comes from 19,118 records in 28 countries and territories, from 1850 to 2026. Most records come from Sweden.

• 19,118 records
• 28 places
• 94 years recorded
• Maxillopoda class

Observation evidence passport

Compare this animal’s observation pattern

When it is recorded

Peak month: August. Records cluster in the months an animal is present and being looked for, so a summer peak can reflect observer effort as much as the animal.

Records over time

Recording effort has risen steeply almost everywhere since the 1990s, so a rising line usually shows more observers rather than more animals.

Where Bay barnacle has been recorded

The countries below show where occurrence evidence exists for Bay barnacle. They do not define a complete habitat range: survey effort differs by place, and historical or one-off records can appear alongside repeated presence.