Colouring in Salmon?

Is there such a thing? Putting colours into salmon so that it has the orange colour for freshness appearance?

Does it look like curry oil? But that's the plastic bag that contained the salmon we bought.. Is it normal for the water to turn so orange?

With the news of so many fake food around, can't help but to be a bit cautious. Moreover, the salmon is not for us. It's for our darling!