Should we be alarmed by £2 salmon?

Ted S. Warren/AP/Press Association Images

Whole, frozen, wild salmon has arrived at Asda, for an astonishingly cheap £2 each. The fish is generally considered the superior alternative to farmed salmon, which has been affordable and available for years. It has raised questions as to how it is possible for Asda to offer a luxury treat for such a low price.

It also begs the question of what its rivals will do about it?