Alaska snow crab season canceled after disappearance of an estimated 1B crabs 4 years ago
Disease: Is there a precedent in Earth's natural history of a 90% die-off in two years due to disease
On mobile, so I can't provide a link. Look up sea star wasting disease. It's affected several species of sea star from Alaska to the Gulf of Mexico. One species, the sunflower star went from being everywhere to a red listed endangered species over just a couple of years.