Fish [Yellow Perch] (Osteichthyes)
Background
The Yellow Perch is a ray-finned fish, the ray shaped fins help the perch to move quickly through the water. The Yellow Perch lives in ponds, lakes, and streams. They require fresh water and lots of vegetation/plants. They feed on algae and plankton but, when they get older they feed on small aquatic insects. Larger perch feed on insects, crayfish, snails, mussels, leeches, fish eggs, and worms or even smaller yellow perch. Being a fish, the perch breathes through the gills on the sides of it's body. Female perch lay eggs (up to 40,000) and multiple males fertilize them. The eggs can swell up to a point where a strand of them would be over eight feet long.
External Anatomy
Mouth - composed of the maxilla (upper jaw) and mandible (lower jaw), is used for eatingExternal nares - nostrils that open/lead to the olfactory sacs
Eyes - the yellow perch as lateral eyes and no eyelids
Gills - behind operculum, used for breathing underwater
Lateral line - detects movements and pressure changes in water
Fins - dorsal (on top of the fish), caudal (end of tail), anal (ventral end of tail), pectoral (lateral, paired), pelvic (below pectoral), all work together for swimming, steering, and maintaining equilibrium
Anus - opening used to discharge waste
Internal Anatomy
Swim bladder - sac filled with oxygen, nitrogen, and carbon dioxide. Adjusts the gravity of the fish in different depths of water. Also secretes and absorbs gases.
Olfactory lobes - smell section of the brain
Optic lobes - thin, posterior to cerebrum, vision section of the brain
Medulla - enlargement where the spinal chord and brain meet
Incision Guide
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