In general, yes, most of them mate for life. However, usually if one is killed by a predator then the Survivor will seek a new mate, but not before it's chicks are mature and ready to fly.
no, get a life plz
yes all fish mate
no. fish can only mate with fish of the same species. Gouramis mate with gouramis and platys mate with platys.
Do you mean will they mate with other fish or get along with other fish? They will not mate with other fish, but they will get along without tetras.
To mate fish, you should see how the fish you want to mate, mate. Then you should put them in the same tank and watch them. I'm not an expert so search the web for a more through answer.
of course, why not?
No.
yes, they mate for life
Oscars are the breed of fish that mate the most. However, guppies and trigger fish also mate much more than other breeds of fish.
they mate at the age of nine months
No.
yeah mate!!