The Life Of A Perch In the Sea
Perch Dissection PAP Bio April 8 2014- Vu
Background Info on the Perca
Dissection of a Perch
Perch produce a large number of young instead of relying on camouflage or predator avoidance behavior. This way, even if many young are eaten, some will still survive to reproduce.
The Perch is a freshwater shoal fish found throughout the British Isles and much of Europe, South Africa, Australasia and Asia. There is a yellow perch that is closely related which is an American and southern Canadian species. Perch breed in the late spring, laying their eggs onto any soft weed beds that they can find.
Looking at the Circulatory System
The circulatory system of a Yellow Perch is a low pressure, single loop system. This means that there is one direction of blood flow from the heart, which acts as a pump. Deoxygenated blood is pumped throughout the heart and goes onward to the gills. This is where the blood becomes oxygenated (the gills), getting rid of carbon dioxide. From here the blood goes straight to the body. This makes up one single circuit of the blood flow: Blood pumped à Oxygenated à distributed throughout the body a returns to heart. Blood pumped from the heart in this type of circulation is purely deoxygenated.
Due to the Perch having a closed system, in a single loop within the fish the circulation continues from heart to gills to organs then back to the heart