Ebooks Marine Life Series By Tim Grollimund / 02/14/2017 Share Tweet Share Share This is the fourth ebook in the Marine Life Series. Smashwords Itʼs common knowledge that Goliath groupers were nearly wiped out by overfishing up through the 1980s. Even though Goliath groupers have staged a comeback - estimates are about 35 percent compared to earlier populations - the benchmark figures are inaccurate. The stock is nowhere near historical levels, based on research. Another comment I saw berated Goliath groupers for decimating other fish populations. Not true - about seventy percent of their diet is composed of crabs and other crustaceans. Where there are Goliath groupers, a native species, other fish populations also tend to be more diverse. They complement each othersʼ existence, not decimate it. Harmony, not havoc.