Fish muscles are segmented due to the way they swim.
...Or they swim due to the way the muscles are segmented.
(You'd have to ask nature which came first, the muscles or the swimming)
Much like how a worm uses segmented muscles to move side-to-side through earth, fish use a similar mode of transportation. The way they contract and retract their side muscles called "myomeres" results in the way they swim in that side-to-side motion.
Perch are segmented fish and forms a pattern that appears like a zigzag. Perch are fish found in freshwater and have an oval body shape.
The general consensus among evolutionists is that fish evolved from segmented worms.
They get their food by elongating their muscles and gripping the ground which will seem like their walking.
Animals that have segmented backbones include many vertebrates. Some examples of these organisms are mammals, fish, birds, amphibians, and reptiles.
no frogs and fish dont have segments. only some worms have segments(earthworms)
A crayfish has segments, which are sections of a body that are separated by a crease, so it might be determined as segmented because it has only two so it may be classified but it might not. Worms have many segments.
Arthropods have an exoskeleton and segmented bodies, they include ocean and land creatures.
There will be contractions and expansions of circular and longitudinal muscles passing through the segmented body
Each segment has its own muscles that allow the lengthening or shortening of the body in order to move.
Flies are in fact an insect that has a segmented body. Other insects with segmented bodies include ants and beetles.
Through the gills
They flap their tails and fins and they use their fin and tail muscles! :)