No End to the Rainbow?

Concerned about local customers being fobbed off with Rainbow trout when buying salmon? The Chinese answer is to officially classify both salmonid fish as 'salmon' (https://www.theguardian.com/world/2018/aug/14/china-rainbow-trout-and-salmon-the-same-thing). This is in spite of the two species having completely different life-styles, one being a migrant between salt and fresh waters and the other limited to riverine/lake environments. I suppose it makes as much sense to reclassify wheat and barley as 'rice' (after all, all are grains)?