The annual gathering of giant cuttlefish off the South Australian coast, typically the world's largest mating event for the species, has seen its lowest turnout on record. Official figures released this month estimate that only 1,811 cuttlefish arrived to mate this year, a 97% decrease from the 63,000 recorded last year.
The state government suggests that a toxic algal bloom, which has affected the state's coastline for more than 18 months, may be the cause of this sharp decline. The low numbers have prompted calls for the species to be listed as endangered.
Adult cuttlefish typically die after breeding, making each mating season vital for the species' future. However, in recent months, only 440 eggs have been counted, a stark contrast to the millions usually laid. Manny Katz, a diver tasked by South Australia's Department of Environment and Water (DEW), stated that the success of one breeding season determines the population for the following year.
While it is currently too early to determine the full implications for the species' future, the South Australian Research and Development Institute's executive director, Prof Mike Steer, expressed hope for recovery, citing the population's past ability to rebound under favourable conditions.