All About the Perch

Perch Dissection Pre-AP Biology Period 2 - Bowen Song

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Perca flavescens/fluviatilis/schrenkii

Perch are a type of freshwater game-fish belonging to the family Percidae. It falls under Phylum Chordata and is a part of Kingdom Animalia. There are three species of the perch which can be found in different geographical areas. Perciformes (genus) comes from the Greek, perke, meaning spotted and the Latin, forma, meaning shape.

Perch are carnivorous and are most commonly found in small ponds, lakes, streams, and rivers. They feed on smaller fish, shellfish, and insect larvae and are usually born during the springtime.

Perch are adapted to have rough, tough scales on a long and rounded body. Most commonly sought after by fishermen, they are used mostly for sport and food.

Objectives

Students will learn about the internal and external anatomy of the perch. They will focus on the organs, structures, and functions of the circulatory system. Students will also focus on the ecological presence of the perch as well as the human influence to the perch. Finally, students will learn the evolutionary characteristics of the perch.

Perch Circulatory System

Getting more in depth

Parts of the perch circulatory system: artery, arteriole, capillary beds, venule, vein, heart (atrium/ventricle), artery, gill capillaries

Function: The perch has a closed circulatory system where the blood doesn't flow freely around the body of the fish into cavities, rather, the perch is like most vertebrates and has no open cavities for which the blood can flow. The perch circulatory system provides oxygen to the organs of the body. It is interrelated to all body systems because the perch body systems need oxygen rich blood to function and create energy.

The perch heart consists of one atrium and one ventricle. Oxygen-poor blood is pumped through the heart and then to the lungs. After it is oxygenated, it goes directly to the tissues, where it is carried by the veins back to the heart to have the cycle repeated again.

Ecological Presence

Perch generally spawn in the springtime. They generally lay eggs in groups of 40,000 and attach the strands to underwater plants or sticks.

When introduced to non-native areas, these carnivorous fish can dominate local species.

Evolutionary Characteristics

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Perch Dissection

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