Goldfish have a memory span of at least three months and can distinguish between shapes,colors and sounds. Pretty amazing to imagine these characteristics in a fish,especially since it was once believed that their memory was a mere three seconds . By using positive reinforcement goldfish can be trained to recognize and react to light signals of different colors or to perform tricks. Behavior can vary widely because of their environment and can be conditioned by their owners. Goldfish have strong learning abilities and social learning skills. Their visual acuity enables them to distinguish between individual humans. After being in a location the provides them with constant visual contact and some time to adapt a goldfish will take food from its owners hand. Since they are social animals they tend to thrive with more of their own variety in the tank,but it is important to not mix varieties as the fancy types don't swim as well and may not get adequate food if kept with the common variety goldfish.
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