known variously norway compare slim orange pink grows long important commercial europe extant species genus species moved closely related genus lives north eastern atlantic_ocean parts mediterranean_sea absent baltic_sea black_sea adults emerge night feed worms fish description typical body shape albeit narrower large species pale orange colour grows typical length centimetres exceptionally long including tail claws covers animal abdomen long ending broad tail fan pairs legs bear claws greatly elongated bear ridges spines pairs antennae second longer thinner long compound eyes kidney shaped providing genus greek roots kidney eye distribution found north eastern atlantic_ocean north_sea far north iceland northern norway south portugal common mediterranean_sea adriatic_sea notably north adriatic absent black_sea baltic_sea ecological demands particular sediments distribution divided populations populations separated terrain adults rarely travel distances greater metres ecology adults prefer inhabit muddy sediments percent clay semi permanent vary structure size typical centimetres deep distance centimetres entrances norway spend time lying entrance leaving shelters forage mate diet predator makes short foraging mainly periods subdued light feed active prey including worms fish capture walking legs food conveyed mouth anterior walking legs assisted parasites host number parasites number organisms attach including overall suffers fewer crustaceans december discovered attached found member new finding described highlight decade found populations north atlantic mediterranean_sea individuals found segments generally concentrated central parts larger significant parasite genus caused epidemic infection populations 1980s genus contains major wide variety crustaceans internal taxonomy poorly resolved species attacks causes syndrome originally described post syndrome turns highly white animal appears parasites include life cycle typical life span years reaching years exceptional cases reproductive cycle varies depending geographical position periods hatching spawning length period vary latitude breeding cycle changes annual moves south north eggs temperature dependent colder climates duration period increases means time hatching occurs late females year breeding cycle warmer climates combined effects recovery maturation mean spawning delayed turn effect female missing year egg carrying adult male twice year usually late winter spring adult females year late winter spring hatching eggs annual breeding cycles mating takes place spring winter females soft post state mature spring summer months egg laying takes place late summer early autumn spawning egg carrying females return remain end period hatching takes place late winter early spring soon hatching females mate stage typically months duration larvae exhibit vertical migration behaviour dispersed local currents complex interaction determines fate larvae overlap destination spatial suitable benthic habitats favourable order larvae settle reach maturity fisheries muscular tail frequently eaten meat known eaten special occasions spain portugal expensive common important species fisheries caught tonnes caught annually half united_kingdom waters individual biological stocks identified functional units number functional units sea areas total catch set annually example set north_sea based aggregate total recommended science separate functional unit areas method attracted criticism promote exploitation specific functional unit overall implemented package emergency technical measures aimed recovering stock close collapse fishery account energy requirements certain marine boats involved fishery catch number fish species sole thought revenue fishery economically taxonomic history species included 10th edition starting point nomenclature work listed type locality norwegian sea choosing restricted type locality southern sweden synonyms species published described eccentric zoologist material collected mediterranean_sea described new genera erected species moved reaching current position erected genus hold species seven fossil species described genus populations mediterranean_sea separated var taxon universally considered valid
Nephrops norvegicus