The life of a perch

perch dissection-PAPBio-3rd per

represented by: MOJDE YADOLLAHIKHALES

Objectives

learn about the external and internal anatomy of a perch. Focus on the organs, structures, and functions of the circulatory system. Understand the ecological role of the perch.

Perca flavescens

The yellow perch commonly referred to as perch, is a freshwater fish native to much of North America. Other common names for yellow perch include American perch, lake perch, raccoon perch, ringed perch, and striped perch. Zooplankton is the primary food source for young and larval perch. large adult perch feed on invertebrates, fish eggs, crayfish, shrimp, and fish. The yellow perch has many adaptations to allow it survive in diverse conditions. Perch also have specialized teeth called palatines that they use to eat other small fish like minnows and even some insects. They can also filter out zoo plankton with their gill rakes. Perch is in the class Osteichthyes since it has bony skeleton.

Taxonomy & Evolutionary relation ships of perch

Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Perciformes
Family: Percidae
Genus: Perca

Species: flavescens

PERCH DISSECTION

External anatomy:

Fins- 2 dorsal fins, 2 pectoral fins, 2 pelvic fin, an anal fin, and a caudal fin

Gill Opening- where the water goes so that the fish can get its oxygen

Operculum- cover and protect the gills

Lateral Line- a sensory organ that has sacs filled with fluid with hair-like sensors that are open to the water through pores, it senses pressure, currents, and movement in the water

Internal anatomy:

Circulatory system

The circulatory system of the perch is a typical low pressure single type system in which the heart is a single pump and there is a single circuit of blood flow. Venous (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. To prevent the back flow of blood from occurring there are valves that keep the blood flow moving in one direction.

Fun facts

- The perch uses its fins as a defense when threatened
- Have a unique spawning method, the females release their eggs in long gelatinous strands that usually hang from vegetation
- Swim Bladder: the bladder can fill with air to help the fish float to the surface without swimming, and can deflate with air to help the fish float down without swimming