Excellent information, the fact that the water temp didnt start to change until around 26 to 27 feet, affirms my belief that crappie react more to light conditions than they do temperture. they can regulate thier body temp for the most part, but the uv light they cant shield out.

How do you propose the fish is regulating its body temp?

"Jumping-Jacks"

thats so 80s pepop today they have tiebow and yoga.

You can take a goldfish, freeze him in a bowl of water, in the freezer overnight, take it out the next day, let it thaw, and he will be swinmming around like a champ.. How do you propose that happens?

Read this...

http://texasfishingforum.com/forums/ubbt...rmocline#UNREAD

" because fish are cold blooded, they must regulate their own body temp."

Not to mean to offend, but your statement would mean that warm-blooded animals don't regulate their own body temperature. If this is the case, what is regulating a mammals body temp? You have it backwards. In warm-blooded mammals, this is why we have a hypothalamus--so that our bodies can regulate our own temperature. In order for a fish to regulate its temp, it must seek water that is at a temperature conducive to its needs. Some fish, such as sharks and some other "marine" species can themoregulate to a certain extent, but they have a different physiology that allows them to do this rather than the hypothalamus. You can freeze a goldfish in a pond and thaw it out due to its ability to switch from aerobic metabolism (using oxygen as an energy source) to anaerobic metabolism (using glucose C-6 H-12 O-6) in its blood) to break the oxygen off of the glucose as an energy source. The fish is in a state of hibernation; but it's heart hasn't completely stopped. If you truly freeze a goldfish, it will die. Buy one, put in some water in the freezer for about an hour and it will probably be ok. Leave it in there for a week and it will probably deader than a doornail (I'm not sure exactly how long it will take). Now...if it was truly and "completely" frozen in both circumstances, why wouldn't the results be the same? Just a thought.

Don't get argumentative. The first words out of my mouth earlier were "not to offend". I never said that I have not seen a goldfish "frozen" in a water trough, what I said was, I didn't know how long one could survive in frozen water. Eventually it will die. And I am not wrong on how humans regulate their temp. What do you think tells your body to sweat so that the sweat can evaporate to begin with? The hypothalamus. Please Explain how a fish can self regulate its temp. All I am doing is asking questions. Coming on this board is sometimes like watching the discovery channel and I want to know more.

I didn't mean to get technical. And I didn't have to research it (I have a Masters degree in biology) . I was just confused about your statement that fish can regulate their own body temperature. They can't regulate their temperature through metabolism. No cold blooded creature can. Their body temperature rises and falls with their environment. Now, with that being said, I think what you mean is that they try to regulate their body temp. through behavior, like swimming up or down in the water column. Yes, hands down, I completely agree with that. I apologize for the discussion. I believe that I must have mis-understood what you were saying.

I didn't mean to get technical. And I didn't have to research it (I have a Masters degree in biology) . I was just confused about your statement that fish can regulate their own body temperature. They can't regulate their temperature through metabolism. No cold blooded creature can. Their body temperature rises and falls with their environment. Now, with that being said, I think what you mean is that they try to regulate their body temp. through behavior, like swimming up or down in the water column. Yes, hands down, I completely agree with that. I apologize for the discussion. I believe that I must have mis-understood what you were saying.