Tell us about the arowanaâaka the dragon fishâand why it has become so valuable. The Asian arowana is the worldâs most expensive aquarium fish. It is a tropical freshwater fish from Southeast Asia that grows three feet long in the wild. Thatâs roughly the size of a snowshoe. [Laughs.] It is a fierce predator dating back to the age of the dinosaurs.
A personality disorder is an enduring pattern of inner experience and behavior that deviates markedly from the expectations of the individual's culture, is pervasive and inflexible, has an onset in adolescence or early adulthood, is stable over time and leads to distress or impairment.
Psychological Disorder A psychological disorder is a disorder of the mind involving thoughts, behaviors, and emotions that cause either self or others significant distress. Significant distress can mean the person is unable to function, meet personal needs on their own, or are a danger to themselves or others. Another popular definition of mental illness is a person's inability to work or to love.