Bluefin tuna is now very prevalent off the coast of Ireland, whereas it was not seen there 50 years ago.

Omissions

• The claim's 'very prevalent' is qualitative; the most recent scientific source (PNAS, 2026) states bluefin tuna have 'reappeared in abundance in the past decade' in Irish coastal waters, which supports but is somewhat softer than 'very prevalent'.
• Most bluefin tuna encountered in Irish waters are juvenile fish; the return reflects improved international conservation management (ICCAT quotas) after the stock was severely overfished in the 1960s–1970s.
• The claim is a general ecological observation; no specific abundance figures (tonnes or catch numbers) for 2025/2026 were cited.

Sources

• PrimaryInland Fisheries Ireland — Tuna CHART 2026 FAQ GuideIn 2026, a maximum of 25 authorised sea angling charter skippers will be permitted to catch, tag and release Atlantic bluefin tuna in Irish waters as part of the CHART programme.
• PrimaryInland Fisheries Ireland — 'IFI records first tagging of an Atlantic bluefin tuna of 2025'Inland Fisheries Ireland has recorded the first capture and tagging of an Atlantic bluefin tuna of 2025. The enormous fish, measuring 1.95 [m]...
• AcademicProceedings of the National Academy of Sciences (PNAS) — 'Ensuring the future of Atlantic bluefin tuna' (Block et al.)ABT have reappeared in abundance in the past decade in coastal waters of Norway, Ireland, the United Kingdom, Sweden, and Denmark after several decades of [absence].
• AcademicICES Journal of Marine Science — 'Evidence of increased occurrence of Atlantic bluefin tuna in [Irish waters]' (Horton et al.)Evidence of increased occurrence of Atlantic bluefin tuna in [Irish waters]... All records from the CSHAS survey occurred off southeast Ireland in the Celtic Sea.