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In fast swimming fishes, propulsion is mainly due to
  • a)
    Pelvic fins
  • b)
    Caudal fin
  • c)
    Dorsal fin
  • d)
    Pectoral fin
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
In fast swimming fishes, propulsion is mainly due toa) ...
Propulsion in Fast Swimming Fishes

Propulsion in fishes refers to the force that helps them move forward in water. Fishes use their fins to push the water and generate thrust, which propels them forward. Fast swimming fishes such as tuna, swordfish, and marlin use their caudal fin (tail fin) for propulsion.

Explanation

The caudal fin is the main source of propulsion in fast swimming fishes. It is a vertically oriented tail fin, which is composed of two lobes, the upper and lower lobes. The upper lobe is usually larger than the lower lobe and provides the main propulsive force. The lower lobe helps to stabilize the fish during swimming and also provides some propulsive force.

The caudal fin works like a propeller, converting the energy from the fish's muscular movements into forward thrust. When the fish flexes its body, it causes the caudal fin to move from side to side, creating a wave-like motion that propels the fish forward. The faster the fish moves its tail, the greater the amount of thrust generated.

In addition to the caudal fin, fishes also use their other fins, such as the dorsal, pectoral, and pelvic fins, to control their movements and maintain stability. The dorsal fin helps to prevent rolling, the pectoral fins are used for steering and braking, and the pelvic fins are used for stabilization and maneuverability. However, these fins do not provide significant propulsive force in fast swimming fishes.

Conclusion

In conclusion, the caudal fin is the main source of propulsion in fast swimming fishes. It works like a propeller, converting the energy from the fish's muscular movements into forward thrust. Other fins such as the dorsal, pectoral, and pelvic fins are used for control and stability but do not provide significant propulsive force.
Community Answer
In fast swimming fishes, propulsion is mainly due toa) ...
The answer is caudal fin.. One wave created due to caudal fin is followed by the another and so on. This transmits a backwards momentum to push the water backwards.
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In fast swimming fishes, propulsion is mainly due toa) Pelvic fins b) Caudal fin c) Dorsal fin d) Pectoral fin Correct answer is option 'B'. Can you explain this answer?
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