According to a study in Science, 29 percent of commercially edible fish and shellfish populations have collapsed already

In response to the study, the U.S. National Fisheries Institute, an industry trade association, said more than 80 percent of fish stocks remain sustainable and aquaculture can fill the gaps.
And really, who are you gonna believe: them, or a group of researchers who spent four years studying all available data on fish populations and ocean ecosystems?
Particularly, the Blue Fin Tuna is under scrutiny this year.