Fish and Frozen Ponds
Name: Robert I.
I am working on a science project with my second grade
daughter and am having a hard time finding research information on our topic.
Her question: Do the fish freeze when a lake "freezes" over?
Hypothesis: No. The fish do not freeze when a lake freezes.
Method: Fill a bowl of water and partially freeze it and see if the rubber
fish inside the bowl freeze.
I have been serching the web for related material on how water freezes,
lake ecosystems, frozen pond ecosystems and can't find any relevent
information. Where can I find reference material on this subject? Thank
you for your help
Normally we do not answer science fair questions.
The bottom of the lake or pond is at 4 C and is denser than ice. Ponds,
lakes, and bodies of water in general freeze from the top down. The fish
at the bottom, while highly inactive at 4 C, are alive and well.
Consult Paul Hewitt's Conceptual Physics book. He describes the freezing
of a pond in great detail.
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Update: June 2012