9
   

Warm Blooded Fish?

 
 
Reply Thu 14 May, 2015 06:59 pm
Cold fins, warm heart? Strange but true, scientists say.

http://www.khou.com/story/tech/2015/05/14/warm-blooded-fish-discovered/27318727/

In a discovery that defies conventional biology, a big fish that lives deep in the Pacific Ocean has been found to be warm blooded, like humans, other mammals and birds.

Researchers from the National Oceanic and Atmospheric Administration (NOAA) determined that unlike other fish, opah generate heat as they swim and distribute the warmth throughout their entire disc-shaped bodies by special blood vessels. Special "counter-current heat exchangers" in their gills minimize heat loss, allowing the deepwater predators to keep their bodies several degrees above the water temperature 250 feet down.

"There has never been anything like this seen in a fish's gills before," said biologist Nick Wegner, the lead author.

Though some species of fish can temporarily warm their swim muscles, including tuna and some sharks, "whole-body endothermy" has distinguished mammals and birds from fish and reptiles, which draw heat from their environments.

"The opah appears to produce the majority of its heat by constantly flapping its pectoral fins which are used in continuous swimming," Wegner toldLive Science.

His colleague Heidi Dewar toldThe Washington Post "I think that it's really exciting that we spend so much time studying especially these larger fish to find something that's completely unique and has never been seen before in any fish."

Their team's findings are published in the May 15 issue of Science.

Also known as the moonfish, the opah averages 100 pounds, has a diameter of 3 feet and can grow to up to 6 feet long. While deepwater fish are slow moving because of the cold, the opah's warm-blooded uniqueness results in faster swimming, better vision and quicker responses, giving it an edge in the survival sweepstakes.

"Before this discovery I was under the impression this was a slow-moving fish, like most other fish in cold environments," said Wegner, of the Southwest Fisheries Science Center, in La Jolla, Calif. "But because it can warm its body, it turns out to be a very active predator that chases down agile prey like squid and can migrate long distances

Opahs, which don't swim in schools, are regularly caught either by longline fishermen from California to Hawaii to New Zealand seeking tuna or unintentionally in commercial driftnets.

An old fish tale held that opah brought good luck, NOAA says, so fishermen would give the colorful catch away rather than sell it. But times and marketing have changed, and food fetishists are increasing demand for its "rich, tasty meat."

Two years ago, recreational anglers in Southern California caught a 125-pound opah during a rockfish outing. The "mystery fish" put up a 45-minute fight, leading the captain to think it was a shark, GrindTV reported.
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Type: Discussion • Score: 9 • Views: 1,224 • Replies: 16
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FBM
 
  1  
Reply Thu 14 May, 2015 07:14 pm
@edgarblythe,
Cool.

Or warm...or something.
0 Replies
 
edgarblythe
 
  1  
Reply Fri 15 May, 2015 02:06 pm
It's a revelation to me. I didn't know any fish were capable of any heat generation. Guess I should have gone to school after all.
farmerman
 
  2  
Reply Fri 15 May, 2015 02:49 pm
@edgarblythe,
tuna are warm blooded all the time. Its just that they regulate their temps wrt the water . They achieve the highest difference in the coldest waters. Mckerel are warm blooded too. I think we had a thread about this a while back. Maybe ro started it. I forget.

farmerman
 
  1  
Reply Fri 15 May, 2015 02:51 pm
@farmerman,
forget it. It was at another site
Ragman
 
  2  
Reply Fri 15 May, 2015 07:51 pm
@farmerman,
Oh yeah..that website, I had to scale back on that site 'cause something seemed fishy.
0 Replies
 
neologist
 
  1  
Reply Mon 18 May, 2015 10:50 am
@edgarblythe,
Warm Blooded Fish?
No surprise, considering all the cold blooded politicians we endure.
0 Replies
 
Ionus
 
  1  
Reply Mon 18 May, 2015 10:27 pm
Yes, Barramundi, warmed to a nice white colour, with a dash of lemon and a mild side salad... Very Happy
0 Replies
 
Ionus
 
  1  
Reply Mon 18 May, 2015 10:28 pm
@farmerman,
Hey, FM...where's all the fish you caught ? Evil or Very Mad Thanks for sharing...
farmerman
 
  1  
Reply Tue 19 May, 2015 03:27 am
@Ionus,
I usually only keep like 2 aand they go in my BELLY.

The others Ill usually release for another day's fishing.


Ionus
 
  1  
Reply Tue 19 May, 2015 03:45 am
@farmerman,
What do you catch ? Perch, Bream ? Minnow ?
farmerman
 
  1  
Reply Tue 19 May, 2015 03:57 am
@Ionus,
trout mostly, but Sometimes a small mouth bass will take the bait. Bass season doesnt open for another two weeks so I try to not booger em up while bringing them in. They really put up a figt nd you hve to be gentle.

I caught a damned carp and a fallfish several times (they are like 25 pound minnows) . These are just trash fish to me (the old Italian men catch em and use em to make Bacalla, bt theres waaay too many bones for me and I just dont like carp)

Lots a fish we have are just for catching and not eating. Trout, sunfish, perch, bass, are all good for the pan nd my wife makes up a nice crispy fish dish. She uses two pans so the fish can lie there crisping up and not dropping thir coatings. She then maked up sweet ginger soy sauce with a bit a peanut butter and sesame . Its great.
With a side dish of fresh home grown asparagus, its a great springtime supper

Ionus
 
  0  
Reply Tue 19 May, 2015 06:18 am
@farmerman,
Quote:
Lots a fish we have are just for catching and not eating. Trout, sunfish, perch, bass, are all good for the pan nd my wife makes up a nice crispy fish dish. She uses two pans so the fish can lie there crisping up and not dropping thir coatings. She then maked up sweet ginger soy sauce with a bit a peanut butter and sesame . Its great.
With a side dish of fresh home grown asparagus, its a great springtime supper
https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQd3p9z9BKLJneiLkAfytNaxyuTBGE54R_uzs-3G72SmMOAc8WA7DFNhA
0 Replies
 
Ionus
 
  0  
Reply Thu 21 May, 2015 08:47 am
@farmerman,
Do you ever hunt FM ? I shot a turkey once . Frightened the crap out of the people in the frozen food section...

I also went bunny shooting once and got some great winter furs from down in the high country . Bought a do-it-yourself tanning kit and learnt some more survival skills .
farmerman
 
  1  
Reply Thu 21 May, 2015 09:56 am
@Ionus,
I once shot a bear in my pajamas. What he was doin in my pajamas Ill never know.
Ragman
 
  1  
Reply Thu 21 May, 2015 02:35 pm
@farmerman,
Q: Do you know why ivory hunters travel to Alabama?






A: Because that's where the tusk are looser.
0 Replies
 
thack45
 
  1  
Reply Thu 21 May, 2015 04:20 pm
0 Replies
 
 

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