This is an interesting topic!
I remember an interview with the author of the book "What a Fish Knows" written by Jonathan Balcombe on Mysterious Universe a couple of years ago and got blown away by the stories he told.
One of the examples I remember from the interview was a fish who picked up a stone from the fish tank floor and knocked it against the glass to get attention from one particular human in the family.
As long as we use fish as a food source many of us is probably hesitant to admit that our aquatic friends is intelligent and have a "Social life" of their own. Also, the lack of similarities to more familiar mammals their expressions and behaviors could be harder do decode.
Cheers, ErlendHi @Valth
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Hi, @erlendgroseth.
That's an incredible story. I have also read about how some people have been training goldfish to swim in mazes, so they can definitely be trained to to stuff like this. But it's even more cool if the fish learned this by itself.
I agree with the points you are making regarding the fact that we might not want to accept their intelligence and social life, because then we would hae to feel bad about eating them, or treating them bad when keeping them in small fish tanks.