But according to the article stress hyperthemia is one trait used to identify consciousness. Is consciousness the same as "having feelings"?

>One particular trait used to identify consciousness, which was previously thought to be absent in fish, is the capacity for stress-induced hyperthermia or “emotional fever”. This is a physical reaction similar to a fever caused by infection, but in this case the trigger is a stressful situation. Basically, the body gets warmer in response to stress.