Presenation of a Perch

Ella Hawes April 9, 2014 PAP Bio Vu-7

Perca flavescens

The perch is classified under the Kingdom Animalia, the phylum chordata, the subphylum Vertevrata, the class osteichthyes, the order perciformes, the genus perca, and the species Perca flavescens. A perch is a spiny-rayed fish with one or more sharp spines on their fins. They also have two dorsal fins, and one anal fin. These fish also posess a swim bladder and well developed respiratory system including gills.

Objectives

Students will read about the anatomy of a perch. The focus of the disection is the circulatory sytem. The ecological role of the perch will also be explained.

Background Information: Habitat

Most perch live in small freshwater ponds, lakes, streams, or rivers. One location that has a large perch population is the Great Lakes. These fish prefer clear water with moderate vegitation. They also live in nearshore areas with slow moving currents. Generally, larval perch will migrate off shore for protection.

Background Information: Predators

The perch has many predators including largemouth bass, smallmouth bass, black crappie, channel catfish, chain pickerel, walleye, bluegill, herons, gulls, eagles, hawks, kingfishers, and mergansers. Pictured below is a heron.

Background Information: Adaptations

The perch has adapted in many ways. For example, they have specialized teeth called palatines. These teeth are used to eat other small fish. A perch also has small filters in their gill called gill rankers. These gills filter out zooplankton.

Background Information: Life Cycle

The perch starts out as an egg, matures to a larvae, grows to a juvenile, becomes and adult and can then reproduce. Reproduction, also known as spawning, occurs between April and July. The female ejects her eggs in the form of a thick stand which are later fertilized.

Dissection Video Tutorial

Bony Fish (Perch) Anatomy

Perch Dissection Lab

Perch Circulatory System

The circulatory system of a perch contains a heart that has one atrium and one ventricle. Deoxygenated blood is pumped through the heart to the gills. It is then oxygenated and sent back through the body of the fish.

Extra Information

A few fun facts about the perch include:

-Perch can reach a maximum size of 18 inches.

-Perch are known to live as long as 13 years.

-Males reach sexual maturity between ages 1 and 3.

-Perch fish is consumed all over the world and it generates substantial commercial income from fish farming