This is not just about fish. It's research that challenges a lot of established beliefs about what sets primates apart. Not just observation, but testing. Great article, really interesting.
I don't understand the suggestion that cooperation and complex social systems are the province of primates. Haven't they heard of dogs, cats, pigs, deer, or the countless other animals that hunt or defend themselves cooperatively, and which have complex hierarchies in group behavior?
This is really mind blowing.
This type of thing is why I have been saying for a few years that AGI researchers should really be trying to emulate the true capabilities of simple animals first rather than humans.
That's how OpenCog is designed to work, isn't it? Boot up primitive intelligences that learn over time by themselves.