Most tropical marine fish could survive in a tank filled with human blood.

how is this even known? morbid curiosity

How did they fill the tank with pure blood? Can't they better use it for humans?

EXACTLY HOW IS THIS KNOWN??? SERIOUSLY!! THATS DISTURBING

Taken from Yahoo answers: http://answers.yahoo.com/question/index?qid=20100122022644AAyt1nB
Unless you're an extremely hungry leech, or a blood parasite, NO, tropical fish, nor anything else, can NOT survive in a tank of blood.............

I don't know where you got this horrific idea, but it's not true. And if anyone believes this myth and decides to test it, not only would that make them a clinically insane and sick individual, but they'd have PETA on their a** in a heart beat.... (Not saying I support them at all...)

Quite sadly though, the base of this is a common myth haunting the internet media and many have accepted it as fact without doing the proper research. The myth to examine here, is "Is it true that blood has the same pH and salinity as salt/ocean water?"....

So here's the facts:

A pH of 7 is neutral. The lower the pH, the more acidic and the higher, the more basic. The normal blood pH is tightly regulated between 7.35 and 7.45. Ocean water has a pH of 8-8.16.

The salinity of blood is about 0.9% salt general concentrate, where as sea water is about 3.1% and 3.8% on average.

End Conclusion:
No, blood and salt water are not the same. Blood is slightly more acidic, and salt water is ruffly 9x saltier than our blood. Salt water would easily kill us, as would a tank of our blood kill an ocean fish.


BTW, fish don't have lungs; they have gills. They work by filtering water to absorb oxygen molecules around them. Lungs on the other hand, work by sucking in air into specialized sacks that get decreasingly smaller until the supply can easily reach capillaries. From there, both methods of breathing exchange oxygen molecules through a semipermeable membrane within the lining of the capillary walls. The molecules then directly attach to red blood cells which flow through the blood stream until they reach the area of the body where oxygen is needed.

Also, most tropical fish require a water temperature of 72 degrees up to about 92 degrees. (Depending on the species of fish and if you have any living corals...) The human body requires an average temperature of 98.6 degrees F, which is too warm for most species...

If you were to somehow get a tank of blood and put fish in it, and they were somehow able to breath in it, the temperature required to keep them at would be too low to maintain the blood at proper "fluid-like" consistency and it would ultimately clot. Not to mention all sorts of other blood keeping problems.... Basically, unless it's kept in the body, or extracted and stored correctly, it'll just rot and become a horrific mess.....

For real? How the F does anyone find that out? Where does one get enough human blood to try that?

Anonomys man who thinks he's so right, if fish don't have lunch but gills and filter the Easter for oxygen, they can forge same to blood. Blood contains oxygen so it would actually work the same way.