Specimens of Euchaeta norvegica and Euchaeta hebes (Crustacea: Copepoda) we
re collected west of the Isle of Man, Irish Sea, between February and April
1993. There are no previous records of these species in the plankton of th
e Irish Sea. It is thought that they were carried into the central southern
Irish Sea by incursions of water through the St George's and North Channel
s.