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Gasterosteus aculeatus – Three-spined Stickleback
Species, Bony fish (Actinopterygii), Freshwater, marine, terrestrial
Tiddler, Crethyll Tri Phigyn, Crothell Dri Phigyn
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Gobio gobio – Gudgeon
Species, Bony fish (Actinopterygii), Freshwater, terrestrial
Llyfrothen Dwr Croyw, Llyfrothod Dwr Croyw
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Gymnocephalus cernuus – Ruffe
Species, Bony fish (Actinopterygii), Freshwater, terrestrial
Pope, Crychod, Crychyn
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Lampetra fluviatilis – River Lamprey
Species, Jawless fish (Agnatha), Freshwater, marine, terrestrial
Lampern, Llysywen Bendoll yr Afon, Llysywod Pendoll yr Afon
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Lampetra planeri – Brook Lamprey
Species, Jawless fish (Agnatha), Freshwater, marine, terrestrial
Llysywen Bendoll y Nant, Llysywod Pendoll y Nant
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Leuciscus idus – Orfe
Species, Bony fish (Actinopterygii), Freshwater, terrestrial
Ide, Orff, Orffod
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Leuciscus leuciscus – Dace
Species, Bony fish (Actinopterygii), Freshwater, terrestrial
Dars, Darsen
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Liza aurata – Golden Grey Mullet
Species, Bony fish (Actinopterygii), Freshwater, marine, terrestrial
Golden Mullet, Golden-grey Mullet, Hyrddod Aur, Hyrddyn Aur
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Liza ramada – Thin-lipped Mullet
Species, Bony fish (Actinopterygii), Freshwater, marine, terrestrial
Thin-lipped Grey Mullet, Thin lipped mullet, Thinlip Grey Mullet, Thin-lipped grey mullet, Hyrddod Llwyd Minfain, Hyrddyn Llwyd Minfain
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Lota lota – Burbot
Species, Bony fish (Actinopterygii), Freshwater, marine, terrestrial
Penfras Dwr Croyw, Penfreision Dwr Croyw
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Mugil cephalus – Flathead Grey Mullet
Species, Bony fish (Actinopterygii), Freshwater, marine, terrestrial
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Osmerus eperlanus – Smelt
Species, Bony fish (Actinopterygii), Freshwater, marine, terrestrial
Smelt (Sparling), Brwyniad Conwy, Brwyniaid Conwy
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Parachondrostoma toxostoma
Species, Bony fish (Actinopterygii), Freshwater, terrestrial
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Perca fluviatilis – Perch
Species, Bony fish (Actinopterygii), Freshwater, terrestrial
Draenogiaid Dwr Croyw, Draenogyn Dwr Croyw
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Petromyzon marinus – Sea Lamprey
Species, Jawless fish (Agnatha), Freshwater, marine, terrestrial
creathaill na mara, creathall na mara, Llysywen Bendoll y Môr, Llysywod Pendoll y Môr
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Phoxinus phoxinus – Minnow
Species, Bony fish (Actinopterygii), Freshwater, terrestrial
Pilcod, Pilcodyn
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Platichthys flesus – Flounder
Species, Bony fish (Actinopterygii), Freshwater, marine, terrestrial
Fluke, European Flounder, Lleden Fwd, Lledod Mwd
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Pomatoschistus microps – Common Goby
Species, Bony fish (Actinopterygii), Freshwater, marine, terrestrial
Gobi, Gobïod
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Pungitius pungitius – Nine-spined Stickleback
Species, Bony fish (Actinopterygii), Freshwater, marine, terrestrial
Ten-spined Stickleback, Ten-Spined Stickleback, Crethyll Naw Pigyn, Crothell Naw Pigyn
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Rutilus rutilus – Roach
Species, Bony fish (Actinopterygii), Freshwater, terrestrial
Rhufell, Rhufelliaid