Could the Craze Over Omega-3s Destroy Our Oceans? - With our large appetite for fish meat and omega-3 supplements (in the form of fish and fish liver oil), fish populations are plummeting…fast. 75% of the world’s fish populations are removed faster than they can reproduce, 80% of that is completely exploited, and about 90% of all large predatory fish (i.e. tuna, sharks, cod) have vanished. Scientists now believe that fisheries will collapse by 2050 if current practices continue.