When swimming, the fish determines whether it is the caudal fin, dorsal fin, pelvic fin, or pectoral

The left and right directions are controlled by the tail fin, which determines some of the more subtle movements of the fish.

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Problem description: Which is the key to dorsal fin, split pectoral fin, and pelvic fin?

Analysis: The fins of fish are composed of fin bars and fin membranes attached to the fins. Each fin is supported by a row of soft bars or false spines.

There are five types of fins: dorsal fin, caudal fin, anal fin, pectoral fin and pelvic fin. It can be divided into two categories: one is paired, called even fins, including pectoral fins and noisy pelvic fins; The other type is unpaired and is called odd fins, including dorsal, caudal and anal fins.

The tail fin is mainly responsible for the fish swimming forward; The pelvic fin is mainly used for control, controlling the fish to stop, or swim backwards; The other fins are responsible for keeping the fish in balance at all times. Therefore, the fins are the main organ of the fish to maintain the balance of the body by locomotion.

For most fish, the fins play a role in swimming.

1. The fins have the effect of maintaining the balance of the fish.

2. Fish fins are used by fish to defend against enemies.

3. The fin is the "beautiful coat" that attracts the attention of the fish

4. The tail fin is the "power device" for the fish to move forward

5. The tail fin has a rolling attack to determine the direction of movement.

Dorsal and anal fins: Weeping cherry blossoms fluctuate straight and keep the fish upright.

Tail fin: The left and right ridges swing to push the fish forward.

Pectoral fin: When the caudal fin is not moving, the pectoral fin opens to both sides of the fish body and swings back and forth, and the fish moves forward; When the pectoral fin swings on one side, the fish turns to the side that does not move.

Pelvic fin: The swing range is not large, slightly extended to the sides, keeping the fish stable.

When a fish swims, it mainly relies on the left and right swings of the trunk and tail fin to spew the current to generate forward momentum, and other fins play an auxiliary role. The pectoral fin, pelvic fin, and dorsal fin play a role in maintaining the balance of the fish's body, and the caudal fin plays a role in determining the direction of the fish's movement.

Power is generated by the oscillation of the fins and tail. The pelvic fin is balanced. The pectoral fins remain oriented.

Tail fin: swings from side to side to push the fish forward;

Pectoral fin: When the caudal fin is not moving, the pectoral fin opens to both sides of the fish body and swings back and forth, and the fish moves forward; When the pectoral fin swings on one side, the fish turns to the side that does not move.

Pelvic fin: The swing range is not large, slightly extended to the sides, keeping the fish stable.

The caudal fin is the main motive force** The pelvic fin maintains balance and the pectoral fin regulates the direction.

The fish relies on the caudal fin to generate forward momentum, the pelvic and pectoral fins to maintain balance, and the anal fin to adjust the direction.

Fish rely on the action of the trunk and tail to generate forward momentum.

The trunk and caudal fin generate forward momentum, the dorsal, pector, pelvic and anal fins maintain balance, and the caudal fin maintains the forward direction.

Dorsal fin: Keeping the fish on its side plays a key role in the balance of the fish, if lost, it will lose its balance and roll over.

Pectoral and pelvic fins: balance, if lost, the fish will sway from side to side.

Tail fin: Determines the direction of movement, if lost, the fish will not turn.

Anal fins: Coordinate with the other fins to play a balancing role, if lost, the body shakes slightly.

Fins also have the function of sensing water currents, so they cannot be lost.

caudal fin power pelvic fin balanced pectoral fin orientation.

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The pectoral and pelvic fins control the balance, and the caudal fin controls the direction and exerts force to move forward (forward momentum).