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The betta fish will see the mirror and then will be curious about it, because the mirror reflects the betta fish and they might think that it is another fish, so the fish will act differently.
It will think that there is another fish really there and it will fight at it until you take the mirror away from it or it dies.
Placing a small mirror glass in front of your fighter fish will do the job
Not with many fish, although holding a mirror to a betta will cause it to flare its gills as it will think its reflection is competition
Put a mirror in front of it, that usually drives them mad.
put a mirror in front of the tank if the fish bloats out its gills its a boy.
It is difficult to find this fish's head but it is out there.
A fish eye mirror is a convex mirror
Pictures of fish are often found in animals or water bodies related magazines. For the best pictures of fish, National Geographic probably has the best quality of pictures.
it depends what fish u have if u have a gold fish it would have change their behavior and it will think its another fish
MIRROR
Go Fish Pictures ended in 2007.