Given that the UK is largely surrounded by the ocean and is a mere smudge in comparison to some American states (Texas, California, …). The logistics of the fish coming in chilled is feasible. As you move more inland in the United States (Arkansas, Tennessee, Kansas). Freshwater fish coming in chilled is just not possible or safe, unless shipped via overnight plane (very expensive!)
In the UK that’s not true here. I work at a supermarket distribution centre and fish comes in chilled not frozen.
Given that the UK is largely surrounded by the ocean and is a mere smudge in comparison to some American states (Texas, California, …). The logistics of the fish coming in chilled is feasible. As you move more inland in the United States (Arkansas, Tennessee, Kansas). Freshwater fish coming in chilled is just not possible or safe, unless shipped via overnight plane (very expensive!)