Curator Jamie Oliver said: " I have never heard of a fish being fed crisps. Gouramis usually eat a diet of fruit and vegetation but fortunately Gerty doesn't appear to have suffered any ill effects from her unhealthy addiction. However, we would not recommend feeding fish crisps of any kind."

Gerty is not the only unusual creature to come to the visitor attraction from private owners, and aq uarium staff have nicknamed one display the tank-busters because it houses a number of large fish that grew too big for their previous homes.