A Japanese diver’s long-running interaction with a wild fish has drawn global attention, offering a rare, well-documented example of repeated recognition between a human and marine life over several decades.
Hiroyuki Arakawa, a diver and caretaker of an underwater Shinto shrine gate near Tateyama in Chiba Prefecture, has been visiting the same coastal site for years as part of routine maintenance.The interaction began around 30 years ago when Arakawa encountered an injured Asian sheepshead wrasse and began feeding it to help it recover. The fish, later named Yoriko, remained in the area and gradually started approaching him during his dives.
Since then, Arakawa has continued to encounter the same fish regularly, with Yoriko appearing to recognise him and approach him consistently.
A decades-long bond between diver and fish
Over time, the interaction developed into a consistent pattern. Unlike one-off encounters or short-term conditioning, this relationship has persisted for more than three decades. Arakawa does not follow a fixed schedule, but he visits the site regularly as part of his work, and the fish is reported to appear during many of these dives.
Footage shows the wrasse approaching without signs of distress and allowing close proximity. In some instances, it makes gentle physical contact, behaviour that is uncommon in wild fish without prior conditioning. Arakawa is also known to feed the fish during his visits, continuing a pattern that began when it was injured.
What science says about fish cognition
Research over the past decade has reshaped scientific understanding of fish intelligence.
Studies suggest that several fish species, including wrasses, are capable of recognising individual human faces, retaining learned information over extended periods, and exhibiting problem-solving behaviour.A 2016 study published in the journal Scientific Reports, titled ‘Archerfish can discriminate human faces’, found that archerfish could distinguish between different human faces with high accuracy.
Other research has shown that reef fish can remember spatial environments and social hierarchies.Wrasses, in particular, are considered among the more cognitively advanced fish species, with behaviours such as tool use and cooperative interactions already documented. However, scientists note that such behaviour is often linked to associative learning, such as recognising a source of food or safety.
A case that continues to draw attention
While the exact nature of the interaction remains open to interpretation, Arakawa and Yoriko’s case is frequently cited in discussions around animal cognition and interspecies recognition.It represents a rare example of how long-term exposure, consistency, and environmental familiarity can lead to stable behavioural patterns, even in species not traditionally associated with complex memory or recognition.
