because they use there tail to swim, and they don't have a tail on the front so they cant swim backwards.
A seahorse
humans
all fresh water fish
a fish can swim in the water for ever but a human cant
they eat other fish in the water cuz fish cant come out of the water
silver fish
the bassfishcatreticulum
My meal
No they cant it is impossible
The fish that live at the bottom of the sea are equiped with a swim bladder and by adjusting the pressure in this organ they can go up or down easily as they swim.
Once a fish has died it can't swim.
It seems to me the only land animal that can't swim is the land tortoise. I am only saying this because I believe it is too heavy to say afloat and its feeble arms and legs couldn't possibly displace enough water to keep it's head above water. Other animals might include: Coral and some insects (seems like they just drown).
because they swim in water and have fins
they are a fish with fins and can swim in water