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-streamlined body to reduce resistance/friction )to swim smoothly)
-the vertebral column consists of a series of vertebrae held together loosely so that it is ?exible.
-myotomes/muscles associated with vertebral column produce movement
-the sideways and backwards thrust of the tail and body against water results in resistance of water pushing the fish sideways and forwards in a direction opposed to thrust.
-?exible so as to maintain forward thrust
presence of fins help in propulsion/balance/paired fins (pectoral and pelvic) for controlling pitch and slow down movement/unpaired ?ns (dorsal, ventral, anal) for yawing and rolling (caudal) for swimming/propulsion and steering/change of direction
presence of swim bladder to make fish buoyant
-scales tip towards the back to provide smooth surface.
-body covered with mucus to reduce friction
?attened surface for easy ?oating
Anganifelix answered the question on April 18, 2018 at 12:56
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