45 years ago, ahi (tuna) were caught for fun and ground into pet food. In Japan, tuna was called neko-matagi, meaning “fish that even a cat would disdain.”
In the 1930s, metallic paints were invented for cars. They were made with fish scales and it would take 40,000 herring to make a single kilo of paint.
If you get a zebrafish drunk and put it in a tank of sober zebrafish, the sober fish will adopt it as their leader and follow the drunk fish around the tank.
Miguel Wattson, an electric eel from Tennessee, has its own Twitter account. Whenever he discharges a large enough jolt, a tweet will be automatically send out to his account EelectricMiguel. Apart from sending tweets, he also helps power up Christmas trees at the aquarium.
The fish Sarpa salpa (known as the dreamfish) is hallucinogenic. In 2006, two men who ate the fish described experiencing frightening hallucinations that lasted for 36 hours. These hallucinogenic fishes suggested to contain DMT where one experience is described as “After eating, he experienced intense hallucinations with a science-fiction theme that included futuristic vehicles, images of space exploration, and monuments marking humanity’s first trips into space”.
Betta fish are very intelligent. They have been known to be able to recognize their owners. There are even some Betta fish that can do tricks like pushing a tiny ball through a ring using their nose. This is something that most fish are incapable of.
A fish at the Vancouver Aquarium was given a prosthetic eye so it wouldn’t be bullied by other fish.
In the 17th century, the Roman Catholic Church ruled that beavers were fish and could be eaten on Fridays.
Some lakes are stocked with fish by dropping hundreds of fish out of an airplane flying over.
In 2012, NYU-Poly constructed a robotic fish and placed it in a tank of golden shiners. After simulating the tail movements of a leader fish, the robotic fish was eventually accepted and became their leader.