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Tadamichi Morisaka, a cetology professor at Japan's Mie University, said the dorsal fin of a dolphin spotted biting a man's fingers at a beach in Tsuruga - a port city next to Mihama - matched those of a 2.5m long dolphin observed off the coast of Fukui province last year.

“We have a new view of this phenomenon,” he said, adding that overall the new research shows that despite bottlenose dolphins being referred to as the “white rat” of cetology, there’s still a lot about these marine mammals that scientists don’t know.

Bigg’s killer whales — once dubbed “transient” killer whales because they were seen so infrequently — are now a flourishing 370-whale population, according to Bay Cetology.

In recent years we’ve seen an explosion in new opportunities, in fields such as cetology, linguistics and space archaeology.

What emerges is a brilliant film both for Melville enthusiasts and for those who have tried to read the book and lost their way in the labyrinth of philosophic asides, historical recollections, cetology and archaicisms.