The Life Of A Perch In the Sea

Perch Dissection PAP Bio April 8 2014- Vu

Objectives

You will be learning about the external and internal anatomy of a perches. You will focus on the circulatory system. Students will also understand the ecological role, the taxonomy, evolution, body system, and human impact of a perch.

Background Info on the Perca

Perch is a common name for fish of the genus Perca, freshwater gamefish belonging to the family Percidae. Perch are carnivorous fish that are most commonly found in small ponds, lakes, streams, or rivers. These fish feed on smaller fish, shellfish, or insect larvae, but can be caught with nearly any bait. Adults are eaten by striped bass, walleye, bluefish and weakfish, and eggs and larvae are eaten by bluegill, copepods and other perch. Perch are important to their ecosystem both as predators and as prey. Because they are able to use many different habitats and food sources, and because they have large numbers of offspring, many types of perchs are very common and do not have any special protection status.

Dissection of a Perch

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Taxonomy

For perches the Kingdom Animalia, Phylum Chordata, Subphylum Vertebrata, Class Actinopterygii, Order Perciformes, Family Percidae, Genus Perca.

Evolution

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.

Human Interactions

They are a abundant food supply as well as fished for sport.

Facts

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