Opah, The Only Known Warm-Blooded Fish
- Thread starter FMA4ME
- Start date
I didn't initially, since I'm kinda familiar with this fish, but I just watched the vid since you shamed me into it
Glad I did though, learned a bit more about it........than just the culinary side of it
I didn't initially, since I'm kinda familiar with this fish, but I just watched the vid since you shamed me into it
Glad I did though, learned a bit more about it........than just the culinary side of it
I only ask because the shark/tuna thing was actually addressed in the video, including their differences. was a red flag that Yall ain't watch shhhhh
Being too lazy is no excuse to avoid researching your position!
https://en.wikipedia.org/wiki/Endotherm
The mechanisms may be different (there are multiple), but it's still "warm-blooded". Check it out! For instance, some fish have adapted eye muscles for heat production, warming the brain and decreasing neural response time.
I forget exactly how much it is, but I want to say tuna bodies are something like 12 degrees C above ambient water temp. By comparison, a grouper (not warm-blooded) is only about 0.3 deg C above ambient water temp.
being lazy is an excuse. I use it successfully all the time
from the source you provided: "Mammals and birds are the only extant universally endothermic groups of animals"
but it also says that certain billfish and sharks acheive certain degree of endothermy. I've read conflicting things about whether sharks and tuna are warm blooded or not
and I've heard being said on nature shows that those certain sharks and tunas are not considered typical warm blooded animals
and again, forgive me for being too lazy to provide the names and episodes of those nature shows I heard that being said in.
and according to the video in the op, sharks and tuna can only temporarily warm their bodies. they have to find warmer water to bring their temperature back up
whereas the opah can stay in the cold indefinitely
whereas the opah can stay in the cold indefinitely
I never claimed fish are universally endothermic, just some of them. And if you include the next sentence of the quote: "Mammals and birds are the only extant universally endothermic groups of animals. Certain lamnid sharks, tuna and billfishes are also endothermic."
The mechanisms of heat production differ between mammals, birds, and various fishes. Other fish aren't endothermic throughout their whole bodies. The opah produces heat through swimming and metabolic activity, just like some of the other endothermic fish, but with different muscles. They have a sort of insulated gill structure, where warm blood heats the cool blood coming from the gills. Other endothermic fish do this in parts of their bodies other than the gills.
Here's the journal article for the OP's video: http://www.researchgate.net/profile...s_guttatus/links/555840e308ae6943a874c67b.pdf
