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Biology of Tunas
Why tuna keep swimming
Have you ever heard that tuna is a fish that
Tuna die when they stop swimming. Why?
For breathing:
Tuna breathe through their gills, but they
For this reason, if
For keeping from sinking:
Tuna meat is extremely dense and has a high specific gravity compared to the surrounding seawater, so
Many fish sleep at night, hiding behind rocks or in seaweed, and wake up when the sun is shining to begin their activities.
On the other hand,
Evolution to keep swimming
Tunas got the body specifically to keep swimming by the evolutiono.
Migratory fish such as tuna have
Red-fleshed fish
Many white-fleshed fish live behind rocks or in sandy areas and do not move for very long periods of time.
Because they require less oxygen than red-fleshed fish, they have less hemoglobin and myoglobin in their blood, and as a result, their flesh appears whiter.
In other words, we can say that fish that move around a lot are red meat, and fish that do not move around a lot are white meat.
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We have learned that in order to survive, tuna has changed their body mechanisms to create the characteristic of swimming for the rest of their lives. |
Reference
マグロが生まれた瞬間から死ぬまで泳ぎ続ける理由 止まると沈む?
(translated title: Why Tuna Keep Swimming from the Moment of Birth to the Moment of Death? Do They Sink When They Stop?)
https://tsurinews.jp/44176/
(confirmed:2023/1/7)
in Japanese
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