NO, it is not a challenge because it could happen.
no my fish swim backwards all the time,my other guppies always chases it .
An artificial penis, oh wait thats a dildo.. A fish that swims backwards
it swims?
it depends... is it a salt water or fresh water type of fish. if it is a fresh water kind there is something wrong with it but if it is a salt water kind apparently some have been found to swim backwards for no apparent reason.
a gold fish swims in a fish tank or the sea.It Swims I The Water And Eats Fish Food
because it swims
goldfish
Shark fish
swims for it, fish
The fish swims.
because it swims
Yes, most fish are just aquatic based fish that swim such as a catfish.