because of their fins
keeps it swimming straight
Two fish. One fish swimming going up an another swimming down.
Simple.Because it will be thinking that you are going to kill it.
Simply by swimming. The forward motion of a fish forces water through the gills - supplying the fish with oxygen.
Most swimming in fish is the result of the muscles on the sides of their bodies. You might not ever have thought about how you walk or run, but what you are doing is pushing off the ground with your foot to move you forward. Fish use the muscles on the sides of their bodies to push against the water in a similar manner to swim. -muscular tails for direction and push -swim bladder for buoyancy [helps them adjust whether they sink, float to thetop, or keep going straight]When the muscles on the right side of the fish contract, the tail is pulled to that side of the body, which pushes water backwards, propelling the fish forward through the water. Then the muscles on the right side relax, and the left side contracts, pulling the tail the other way, and this cycle is repeated over and over to produce thrust.
you fish or surf and throw a pokeball at it, pretty straight forward
if your fish is going around the tank with its eyes cosed multiple times.
"What's the [free swimming] fish going to do?"
if it is not swimming it is dead!
Yes, fish can be seen swimming in the ocean.
They have a lot, but they have too many variables: age, size, weight. genetics... there is no straight forward answer to your question.
Whales are mammals which means that they have lungs. Fish do not have lungs, they have gills. Whales also have a different way of swimming than fish. They move their tail fin up and down to move forward. While fish move their tail fin left to right to move forward. Whales also communicate with each other through whale songs. Fish cannot.