21.   Millions of years ago, thick-bodied, bottom-feeding fish swam these icy waters almost alone.

22.   Now fish are swimming around -- around your head!

23.   Sensor fish do not swim.

24.   Some fish swam across the tank to eat.

25.   The fish swam free.

26.   The fish swim so far underneath the ice that it makes it difficult for fish biologists to capture and study them.

27.   The fish had swum south for cooler waters.

28.   The fish swim along the bottom and use these appendages to root morsels out of the sandy bottom.

29.   The gators mostly feed at night when they float in the water with their mouths wide open, waiting for a fish to inadvertently swim in.

30.   The line then started to spin off the reel, the fish now swimming away with the bait.