As a native of Peru I cannot believe they are selling paiche (arapaima) here. This is a huge fish from the Amazon basin; because it has been overfished in the past the population of adults significantly decreased to the point that some countries banned fishing this species (Brazil is a good example). It seems that there are some new fish farm operations (see link)
www.cleanfish.com/system/resources/.../Amazone_Paiche_Info_Sheet.pd
that have been successful breeding (??) this fish to the point that now Peru is exporting the meat of this fish to the US (I hope this is true and there is no damage to the wild paiche/arapaima population).
I had eaten this fish several times in the tropics and I am sure our CCA president , Tony Horos, is probably enjoying eating this fish right now.
I am definitively going to Whole Foods to check this!
Manuel