That would be a fish living in the coastal waters of the UK.
Yes, I realise that, although I'm not sure that anyone has explained to the fish where they are allowed to spend their entire lives, but anyway.
(If anyone had told me a week or two ago that I would be curious about the UK fishing industry, I'd have offered them a thermometer...)
Transboundary stocks
See also: Highly migratory species
Fisheries management, usually adhering to guidelines set by the FAO, provides significant practical mechanisms for the control of EEZs. Transboundary fish stocks are an important concept in this control.[13] Transboundary stocks are fish stocks that range in the EEZs of at least two countries. Straddling stocks, on the other hand, range both within an EEZ as well as in the high seas, outside any EEZ. A stock can be both transboundary and straddling.[14]
https://en.wikipedia.org/wiki/Exclusive_economic_zone#Transboundary_stocksThere is already a UN convention governing the 200 nmi Exclusive Economic Zone (EEZ).
https://en.wikipedia.org/wiki/Exclusive_economic_zoneSo.... in or out of the EU, that UN convention still has to be respected.
From what I can gather, at some point back in time, there was some kind of major gripe leading to various reforms. There are no doubt still some gripes, but how far are they the EU's fault, as opposed to a common - but perhaps misleading - perception?
Therefore, I'm still at a loss as to why UK fishermen seem to be largely Brexiteers (I haven't yet discovered whether this also applies to Scottish fishermen or not.)
What exactly do they stand to gain?