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Most fish move by contracting paired sets of muscles
on either side of the backbone alternately. These
contractions form S-shaped curves that move down
the body of the fish. As each curve reaches the
back fin, backward force is created. This backward
force, in conjunction with the fins, moves the fish
forward. The fish's fins are used like an airplane's
stabilizers. Fins also increase the surface area
of the tail, allowing for an extra boost in speed.
The streamlined body of the fish decreases the amount
of friction as they move through water. Since body
tissue is more dense than water, fish must compensate
for the difference or they will sink. Many bony
fishes have an internal organ called a swim bladder
that adjust their buoyancy through manipulation
of gases... |
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