Why do goldfish attack each other?

Answer

Goldfish tend to attack each other when a food source is scarce. Increased competition for dwindling food sources leads to a fight for the food.

Goldfish are omnivorous, so a balanced diet of meat and greenery should be available. A lack of either can lead to goldfish fights over what is present. In extreme cases of hunger, goldfish attack each other in order to consume the meat to make up for what their diet lacks. Being social creatures, pet goldfish identify with their owner and do not eat unless they are fed by a familiar face, so a lack of this element can also lead to starvation, which in turn creates fights.

Q&A Related to "Why do goldfish attack each other?"
Nope. You are actually quite wrong about that. Without being anthropomorphic, there are many animals that are quite vicious to each other, much like humans are to one another. I'll
http://www.quora.com/Which-species-attack-each-oth...
bassicly the one that started the attack you need to put it in another tank for a few days.
http://wiki.answers.com/Q/What_will_you_do_when_yo...
do they differ in size ? a bigger fish will always eat smaller fish, this applies to goldfish as well, but m sure u must be aware of it. secondly, some fish might have attitude of
http://answers.yahoo.com/question/index?qid=201007...
Dog behavior can be hard to interpret. Although there are different reasons why dogs might lick each others ears, it is usually a positive sign and not a cause for concern. Licking
http://www.ehow.com/about_6614716_do-dogs-lick-oth...
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