Despite common mythology, Goldfish have a memory span in excess of 3 months and can distinguish between shapes an colour. Some goldfish are even able to learn tricks.
As the fulfillment of a fish's dreams are not communicable to humans, there is no point questioning whether a fish is feeling depressed. However, if you do find yourself asking the question, then interpret it as a reflection of guilt you may be feeling for mistreating a living creature (which was originally meant to be for your enjoyment) and make any necessary amendments to the way you look after your pet. With great power comes great responsibility!
The answer is no. People usually think that goldfish get lonely and depressed. This is not true. Goldfish are fine on their own! People usually prefer 2 or more
No they do not, goldfish are egg laying fish only.
Yes, A person can become so stressed that they are depressed
No
no
From not being understood it is possible to be depressed, aggrieved, sad, but not possible to be clinically depressed (medically ill).
will become depressed
Absolutely, anyone can become depressed.
Yes, horses have almost similar emotions as humans. They can feel joy, jealousy, anger, happiness, unhappiness, depressed and excited.
goldfish need to lay eggs. Because if they don't no goldfish would be alive and would not be any more so they would become gone forever.
Probably, but usually the comet goldfish will get all the food and/or the other goldfish will become miserable. This has happened to me before and I do not recommend putting them in the same tanks. Try putting the fancy and comet godlfish seperate!
it couold have been or as goldfish have no memory it is likely it either had a problem of its own or had got used to having another goldfish to bump into that it didnt realise it wasnt there.