Scientists at the University of Oxford trained goldfish to swim 70 centimetres, then stop when someone waved over their tank. When they didn't wave, the fish remembered to swim the same distance.

An aquarium for one goldfish should be around 25-30 gallons. ... Goldfish will eat whatever they encounter in the wild, including algae, aquatic plants, insects, and tadpoles.

Scientists taught goldfish how to drive a tank on land. By Joshua Hawkins. Published Jan 4th, 2022 11:45PM EST. Image: Pixel-Shot / Adobe.

Goldfish aren’t that great at eating most strains of algae to be honest, especially the kinds that are flat on the sides of the tank (i.e. brown algae, green spot algae), though if it’s hair ...

A single common goldfish requires a 100-gallon tank at the minimum. Fancy goldfish don’t get as large as their “normal” ...

He decided to analyze the water of his home goldfish aquarium under a microscope, after it all turned green shortly after he added a Japanese rice fish to the tank. Once the algae responsible had ...