The Marine Stewardship Council, the eco-friendly certification body, responded that the fisheries is now being investigated:
http://www.msc.org/newsroom/news/msc-response-to-the-current-biology-article-2018genetic-detection-of-mislabeled-fish-from-a-certified-sustainable-fishery2019
There have previously been problems with the mislabelling of farmed Chilean sea bass as wild sea bass, which collects a much higher retail price: http://www.sciencedaily.com/releases/2007/07/070730173024.htm
Proper tracking is important since it enables sensible consumer choices, and provides a market for fisheries with better management and fishing practices. The Marine Stewardship Council (MSC) currently has 128 certified fisheries. Although clearly even MSC certification is not a complete guarantee of eco-friendly fish and anywhere along the supply chain things can go wrong, I would say that it is a good place to start. Inform your fish and seafood choices at http://www.msc.org/cook-eat-enjoy/fish-to-eat.
