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Methinks it would be really hard to carry out an experiment to test for fish like this. According to the article in Pratical Fishkeeping, the fish are probably absorbing the toxin through algae they eat in the wild.
Unless someone lives in an area where these fish can be caught...I'd think by the time you bought them from the local fish store, they've probably already lost any toxicity. Going from the person that catches them, to a holding tank wherever they were caught, to a wholesaler in the US, to possibly another wholesaler, or just to your local fish store. That takes some time, right?
Not to mention, they fish you purchased could have just not eaten the bad (or in this case...good?) algae.
Lets buy some small damsels wholesale and eat them like popcorn.
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