Monster Quest on the History channel is investigating lakes in North America, they just tested a lake that at lowest temp is 57 degrees. Its pretty interesting. They are searching because someone caught a piranha in they lake.
Monster Quest Cold Water Piranha
- Thread starter ajbassmaster
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Here are some info on cold tolerance on piranha (pygos)
http://opefe.com/cold1.html
also from what I've seen so far on the news and all, all the so call "piranhas" that were caught in the US were all "Pacus" and the funniest thing is that the fish caught were all confirmed by so call experts and scientists but all the pictures shown were screaming for Pacus.
http://opefe.com/cold1.html
also from what I've seen so far on the news and all, all the so call "piranhas" that were caught in the US were all "Pacus" and the funniest thing is that the fish caught were all confirmed by so call experts and scientists but all the pictures shown were screaming for Pacus.
they actually did a lab experiment seeing at what temperature can piranha survive and they got it down to 52 and the piranha wasnt moving, it just stayed still then all of the sudden it swam as fast as possible looking as if it is trying to heat itself up. They took the temp to 50 and it lost sense of equilibrium and could no longer swim, Yes a cruel experiment to a point but also very helpful information. The lab test was done with RBPs.
P.S. Temps are in degrees Fahrenheit.
P.S. Temps are in degrees Fahrenheit.
yea i saw that show before.
what they didn't test in the lab is that how long can piranha survive at such low temperature. I'm sure the cold water will last a few months so even piranha can stay alive for few minutes doesn't prove that it can stay alive at the the same temperature over the course of few months.
also other cold water predators can make an easy meal out of the immobilized tropical fish under such water temperature condition.
what they didn't test in the lab is that how long can piranha survive at such low temperature. I'm sure the cold water will last a few months so even piranha can stay alive for few minutes doesn't prove that it can stay alive at the the same temperature over the course of few months.
also other cold water predators can make an easy meal out of the immobilized tropical fish under such water temperature condition.
What we also have to remember is that exotic species arn't as badass as everyone makes them out to be (i,e there not super fish that can tolerate any conditions) they are just that, exotic. Species adapt over milions of years for a specific ecosystem and suddenly leaving an ecosystem that supplies them with all the nuitrients they have evolved to require almost always ends up with a dead exotic. Whenever an exotic species is introduced to an ecosystem is almost always (90%) of the time will result in the death of the creature for the obvious reasons (differences in temp, dissolved oxygen etc) and the not so obvious ones (lack of suitable prey species, insuficient nuitrients in prey items).
As well as the species already in an ecosystem have a distinct advantage over the introduced ones because again they are built for that ecosystem.
The ecosystem of the amazon and of a lake in the northern US or Canada is vastly different i doubt a piranha would last longer than a couple weeks even if it could tolerate the cold (which they can't). The native bass and sunfish would outcompete it for available territory and prey items.
i agree with what JP said entirely even if a piranha could last at that temp it would be so sluggish that i'd imagine a huge lake trout/ salmon could come by and pick one off at any moment nevermind it's own inability to feed at such a tempurature.
As well as the species already in an ecosystem have a distinct advantage over the introduced ones because again they are built for that ecosystem.
The ecosystem of the amazon and of a lake in the northern US or Canada is vastly different i doubt a piranha would last longer than a couple weeks even if it could tolerate the cold (which they can't). The native bass and sunfish would outcompete it for available territory and prey items.
i agree with what JP said entirely even if a piranha could last at that temp it would be so sluggish that i'd imagine a huge lake trout/ salmon could come by and pick one off at any moment nevermind it's own inability to feed at such a tempurature.
the same show didn't find big foot either .
the experiment with gradually lowering the water temp was pretty cool though.
the experiment with gradually lowering the water temp was pretty cool though.
smellslikefish;4101641; said:
They found big foot.....he was just a big bird landing at just the right angle with his shadows. lol
My fav was mothman
