This is a complicated but, at the same time, a very simple story that is rarely given in full, frustratingly. The reappearance of bluefin tuna in UK seas is a result of climate change, as was their prior disappearance. Current warmer conditions due to climate change have seen the northwards movement of bluefin tuna in the northeast Atlantic. (Cooler conditions after the turn of the 20th century saw the disappearance of tuna as they moved southwards.) The abundance of bluefin tuna is due to a stock recovery due to a combination of ICCAT fishing quotas and recent successive years of favourable conditions for tuna recruitment in the Mediterranean. See: bbc.com/news/science-environ… The above BBC article is a report on our science here: science.org/doi/10.1126/scia… I have written a 'popular' article in Fishing News here: fishingnews.co.uk/news/why-a… And a thread on X detailing many of the other changes occurring in UK seas here: xitter.cf/PlanktonPundit/status/…

Bluefin tuna are back in UK seas. The climate warming that caused this animal to move northwards has future ramifications for marine ecosystems. I co-authored an opinion piece for the journal Climate Research that, until now, has been behind a paywall but is now, FREE to read. "Absence of an internal multidecadal oscillation in the North Atlantic has consequences for anticipating the future of marine ecosystems:: int-res.com/articles/cr2021/….