The Celtic Sea groundfish community consists of over a hundred species, but the 25 most abundant of these account for 99 percent of the total estimated biomass. The most abundant species are haddock, whiting, and pout Trisopterus spp. Common flatfish species in this ecoregion include dab Limanda limanda, plaice Pleuronectes platessa, and several species of sole and megrim. Pelagic fish species along the shelf edge are boarfish, blue whiting, mackerel, and horse mackerel while Mueller’s pearlside Maurolicus muelleri, glacial lantern fish Benthosema glaciale, and lancet fish Alepisauridae are the dominant mesopelagic species. These pelagic and mesopelagic species are important parts of the foodweb in this ecoregion and changes in their abundance can have significant consequences for the marine food chain. Trends in fishing pressure and stock size are presented in the ‘Selective extraction of species’ section.
The most abundant cephalopod species in the area are long-finned squid Loligo forbesi and southern shortfin squid Illex
coindetii, which are mainly found close to the shelf break, while Alloteuthis subulata is a common species found in coastal
waters. The main exploited species is the cuttlefish Sepia officinalis.