Circulatory system of a Perch

Perch Dissection-PAP Bio- 3/13/14- Xiong, Lizi

Perca fluviatilis

Perch (sometimes also called ) belong in the family Percidae. They belong to the kingdom Animalia under the phylum Chordata and class Actinopterygii. The adult is characterized by ctenoid scales and a long, rounded body. They have paired pectoral and pelvic fins, 2 dorsal fins, and a lateral line system.

Perch are great pets that can be kept in an aquarium. However, it is a predatory fish and must feed on live fish. One must be careful when placing it in a tank with other fish. Make sure that they are not easily scared by the aggressive nature of the Perch and cannot be eaten.

Today's Objectives

Students will be learning about the external and internal anatomy of a perch. Students will focus on the organs, structures, and functions of the circulatory system. Students will also understand the ecological role of the perch.

Perch Cladogram

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In-class Perch Dissection

Perch Dissection

Circulatory System: At A Glance

The circulatory system is a low pressure, single-loop system. There is only one direction that the blood flows. The perch's heart is just one atrium and one ventricle. It consists of 2 chambers. Oxygen deficient blood travels from the heart to the lungs. The gills are important because the blood is oxygenated. Once oxygen is received, the blood is directed to the tissues. It will then travel back to the heart. The Perch is able to survive pressure with this single loop system because it is constantly moving in the water.

Gills: organ that extracts oxygen from water

Heart: muscular organ that pumps out blood

Atrium: upper chambers that receive blood from heart

Ventral aorta: circulates blood to gills, and then through head and body

Dorsal aorta: carries blood from heart to organs

Jugular vein: carries blood from head to face

Liver: filters out blood

The perch's circulatory system is controlled by the nervous system.

Human Impact

One fish in particular, the Nile Perch, was introduced to the Nile in the 1900's. Fishermen fished these plump, meaty specimens. The Nile Perch experienced extreme, exponential growth and wiped out an estimated 150-200 native species. The Perch is also commonly used for dissection in labs.