Anatomy
The general body type of a perch includes a somewhat long, rounded stature. True perch have "rough" or ctenoid scales. On the anterior side of the head are the maxilla and lower mandible for the mouth, a pair of nostrils, and two lidless eyes. On the posterior sides are the opercula, which protect the gills. Also there is the lateral line system which is sensitive to vibrations in the water. They have a pair of pectoral and pelvic fins. There are two dorsal fins, the first one spiny and the second soft. These two fins can be separate or joined. There is also an anal fin, which is also considered spiny, and a caudal fin. The cloaca lies directly behind the anal fin. All perciform fish share this general morphology.
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—Ralph Waldo Emerson (1803–1882)
“Man is a shrewd inventor, and is ever taking the hint of a new machine from his own structure, adapting some secret of his own anatomy in iron, wood, and leather, to some required function in the work of the world.”
—Ralph Waldo Emerson (1803–1882)
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