Pumpkinseed Sunfish (Lepomis gibbosus)
The pumpkinseed is the most widely distributed and abundant sunfish in the eastern United States. They seem to prefer weedy, warm-water lakes and ponds, using weed patches, docks, and logs for cover and usually staying close to shore. They are present in the calm pools of most rivers. The average pumpkinseed is about 5 - 6 inches in length, although some may approach 10 inches.
(via: Cornell Univ.)
Here’s a perch skeleton! Fish have more ribs than we do. Ribs on top, ribs on bottom, ribs everywhere. Also, their upper mandibles move! They have a greater degree of craniokinesis than other vertebrates. I guess this is ok for fishes but in something more complex, on land, mandibular craniokinesis kinda squishes the brain and is maybe not so great for survival.
Drawn from a diagram.