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Opah - The Warm Blooded Fish

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1133539.  Fri May 15, 2015 9:55 am Reply with quote

The Opah is the first and till now only warm-blooded fish known to man.


"Increased temperature speeds up physiological processes within the body," study leader Nicholas Wegner, a biologist at the National Oceanic and Atmospheric Administration (NOAA) Fisheries' Southwest Fisheries Science Center in La Jolla, California, told Live Science. "As a result, the muscles can contract faster, the temporal resolution of the eye is increased, and neurological transmissions are sped up. This results in faster swimming speeds, better vision and faster response times."

1137156.  Thu Jun 11, 2015 12:07 pm Reply with quote

Does QI now accept the term fish?

1137160.  Thu Jun 11, 2015 12:22 pm Reply with quote

Oprah? Blimey, she's let herself go.

1137174.  Thu Jun 11, 2015 1:43 pm Reply with quote

Zebra57 wrote:
Does QI now accept the term fish?

Well, if we don't get a podcast titled "No such thing as a warm-blooded fish," everything is for naught.

As for accepting the word fish, we accept it in food, not much else. "Sea creature and chips" doesn't have the same ring to it.

1137210.  Thu Jun 11, 2015 10:34 pm Reply with quote

Zebra57 wrote:
Does QI now accept the term fish?

Okay, maybe warm-blooded aquatic non-mammal?

1137211.  Thu Jun 11, 2015 10:44 pm Reply with quote

Actually, I just read that there's no such thing as warm or cold blooded.

What is "hot-blooded"? What is "cold-blooded"? Actually, there is no such thing scientifically. The popular term "hot-blooded" basically means having an average body temperature higher than that of the surroundings. "Cold-blooded" is obviously the opposite. Scientists have more technical terms that they use:

- Endothermic: Generating internal heat to moderate body temperature, e.g., modern birds and mammals.

- Ectothermic: Relying on the environment and behavior to regulate body temperature, e.g., typical reptiles.

- Homeothermic: Maintaining a constant internal body temperature, e.g., modern mammals, birds, and some others.

- Poikilothermic: Having a fluctuating internal body temperature depending on the local environmental conditions, e.g., typical reptiles and actinopterygiian fish.


Thermoregulation in organisms runs along a spectrum from endothermy to ectothermy. Endotherms create most of their heat via metabolic processes, and are colloquially referred to as warm-blooded. Ectotherms use external sources of temperature to regulate their body temperatures. They are colloquially referred to as cold-blooded despite the fact that body temperatures often stay within the same temperature ranges as warm-blooded animals.

So, I guess most animals exist somewhere within that range. Going back to the article on the Opah:
The opah, as an endotherm, keeps its own temperature elevated even as it dives to chilly depths of 1,300 feet (396 meters) in temperate and tropical oceans around the world.

was a better way to phrase it rather than use the common term "warm blooded".

Did I just undermine my initial statement?


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