Perch Dissection Lab
Andres Sanchez/ Pre-ap Biology/ 7th period/ Guzman
The general body type of a perch is somewhat long and rounded. True perch have "rough" 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.
Perch Life Cycle
Perch spawn in the spring when water temperatures are between 45 and 50 degrees. Usually this happens in March or April. The fish prefer water that is 5 to 10 feet deep with a gravel bottom or vegetation. One female perch can lay up to 25,000 eggs!The eggs take 20 to 25 days to hatch.
Evolutionary Relationships of a Perch
A two-chambered heart, arteries, gills, capillaries, and veins are the organs of the circulatory system in the Perch. Deoxygenated blood from the body is pumped through the heart forward to the gills. From the gills, where it is oxygenated, the blood goes directly to the body. Thus the blood makes a single circuit during which it is pumped, oxygenated, and distributed to the body, before it returns to the heart. In this pattern of circulation the heart pumps only deoxygenated blood.