GOLDFISH HAVE MEMORIES

Times Online - Newspaper Edition: "In his experiment, goldfish were placed in a bowl in which they were fed only when they pressed a lever. The fish rapidly learnt that pressing the lever produced a food reward.
Once they had been trained in this way, the researchers set up the lever to work for just one hour a day. The fish soon became wise to this, and learnt to press the lever at the same time every day to feed. “The fish worked out that if they hit the lever around that time, they would get some food,” Dr Gee said. “Their activity around the lever increased enormously just before the set hour when their food was dispensed. "