Giant Australian cuttlefish mating numbers crash 97% in South Australia

Every winter, the Cuttlefish Coast in South Australia hosts the world's largest mating event for giant cuttlefish, with hundreds of thousands gathering in some years. This year, official figures released this month estimate just 1,811 cuttlefish turned up to mate, down from 63,000 last year—a 97% drop and the lowest on record. The state government suggests a toxic algal bloom that has affected the coastline for over 18 months may be responsible. Only 440 eggs were counted instead of the usual millions. Divers observed skittish behavior among the few adults. The decline has prompted calls to list the species as endangered. While cuttlefish populations naturally fluctuate, the current situation is unprecedented, and researchers are investigating the algal bloom's role. The species' short lifespan means this breeding season's success is critical for next year's population.