Swordfish for decoration only

The colorful male swordfish will measure the size of his sword before the battle, and usually just show off the respectable weapon that can cause the opponent to flee.

Meanwhile, researchers in the United States also found swordfish who loved the guys with great striped swords.

The fish is male. (Photo: Discovery / Vnexpess)

Since then, the research team believed that this sword did not work as a weapon but was born only to impress women. It is the extension of the tail fin, pointed out like a sword.

"It is not hard and cannot be controlled easily. It is not useful as a weapon but a visual sign of the war," said Kari Benson, research author.

Benson, a biology professor at Lynchburg University in the United States, explains: "The sword may refer to many things: how healthy and fit he is, how well he eats or simply implies that he I am big ".

The researchers placed two males of similar size with a different sword in an aquarium and observed their interaction, mainly chasing and chasing. Next, the group changes the size of the sword by adding plastic pieces to the fish tail.

Every time, the male with the larger sword wins. Usually all he needs to do is show off the sword and the male is gone."My body was lost, due to stress, he put his head down and backed away from the pool," Basolo said.

Brian Trainor, at Ohio University, said: "What surprised me was that when I was given a fake sword, the fish could still determine the size of my weapon."

Trainor added: "People think the fish is not smart. But these animals not only evaluate the size of the opponent's sword, but are comparable to their weapons. I think it's a result. awesome".

He even suggested that there is a link between swordfish and humans, because both species develop traits that do not yield any significant survival benefit. For example, the sword has no effect to defend itself outside of the visual effect. And people have artistic abilities and humorous talents just to impress the opposite sex. And like swordfish, they can eliminate opponents without talent or sense of humor.

MT (according to Discovery)