Our pond fish are ectothermic. Their bodies are 'heated' from sources outside
their bodies, the warmth of the water, the warmth of the sun shining on the
water.
We heat our bodies from inside, the food we take in is our fuel.
A fish gets too cold and it can not digest its food, which is why we recommend
not feeding fish when the water stays below 55 degrees.
The fish sloooows down for the winter and zones away the cold season.
A shark is a fish that is endothermic and heats its body from the food it takes
in.
Any more specific than that and we'd have to find Bret, the fish biologist...


kathy :-)
A HREF="http://www.onceuponapond.com/"Once upon a pond/A