Mirror test hints at surprising cognitive abilities in fish

A fish called a cleaner wrasse interacts with its reflection in a mirror placed on the outside of the aquarium glass at a laboratory in Konstanz, Germany on February 6, 2019. Photo: Alex Jordan via Reuters
WASHINGTON: A small tropical reef fish was able to recognise itself in a mirror, scientists said on Thursday in a finding that raises provocative questions about assessing self-awareness and cognitive abilities in animals. The study involved experiments in which the fish species Labroides dimidiatus, called the bluestreak cleaner wrasse, was given a mirror self-recognition test, a technique developed in 1970 for gauging animal self-awareness.
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