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Following a visit to the site of the incident, Mr Moyes believes the dead fish in the water to be wrasse.

Dr. Kohda knows well how tough persuading scientists can be, after his own extensive efforts to demonstrate self-awareness in the bluestreak cleaner wrasse fish.

Lorian Schweikert was fishing in the Florida Keys when she hooked a hogfish—a type of tasty wrasse that’s known for its ability to change colors to match its coral reef environment.

For that study, the researchers put a parasitelike mark on cleaner wrasses' throats; when the fish saw their reflection, they rubbed themselves on rocks to remove the dot.

In 2019, cleaner wrasses — which are tiny tropical reef fish — were the first fish to pass the mirror test.