The Spotted Greek and Latin Shape

Perch Dissection Aaron Wong Per.6 Guzman

Perciformes - The Spotted Fish

The perch belongs to the genus Perca, of which there are three main species: The European perch, the Balkhash perch, and the yellow perch. These three are defined mostly by where they live; Europe, Kazakhstan, and Canada and the United States; respectively. The perch belongs to the order Perciformes, a greek and latin name meaning spotted shape. Perciformes are the largest order of vertebrates, comprising around 40% of all bony fish. Though there are only three recognized species of perch, the perch is such a common fish that many other fish are called perch, such as the sea perch and silver perch.

Objectives

Students will take note of the internal and external anatomy of a perch. Students will focus on the organs, structures, and functions of the circulatory system. Students will learn about the ecological as well as human benefits of the perch.

Perca

The perch (genus perca) is a freshwater fish, living in small ponds, lakes, streams, or rivers. The perch feeds on smaller fish, shellfish, or insect larvae, meaning that the perch is a carnivorous fish. The perch is preyed upon by bass, catfish, and many birds such as herons, gulls, and hawks, but perch are most commonly used as food by humans. The yellow perch is raised in hatcheries for food and perches in general are fished for by fishermen. In eastern North America, many birds such as cormorants and hawks depend on the perch as a main food source. Yellow perch can also push out other fish species, specifically trout, if the perch is released in lakes. The perch is adapted to life in water by having fins to create forward propulsion and can use these fins to evade predators. Perch are also very tolerant to a wide temperature range, allowing the perch to spread to many habitats. The perch is part of the bony fish, which evolved from cartilaginous fish, such as sharks. The evolutionary path is evident as both the perch and sharks share a lateral line that can sense vibrations and motion in the water.
Conveniently, Your Inner Fish is a PBS series starting 9 April (click the title).
Perch Dissection
Bony Fish (Perch) Anatomy
The first video goes over the dissection of a perch and the second video briefly goes over the internal and external parts of the perch.
This website goes over the basics of dissecting the perch.
A virtual lab of the dissection of a perch.
Internal anatomy of a perch.
The basics of the circulatory system in fish.

Circulatory System

The perch has a low pressure, single loop circulatory system, meaning that the two chambered heart of the perch pumps blood in one direction. Deoxygenated blood is pumped through the heart to the gills to pick up oxygen. This blood then goes directly to the body. Blood is pumped by the two chambered heart through arteries to organs that require oxygen and then through veins back to the heart. Through the circulatory system, oxygen from the respiratory system can reach other parts of the body, like the muscles of the muscular system.
This webpage compares the body systems, including the circulatory system, of various animals, including the perch.
This simple webpage labels various parts of the perch circulatory system while the picture above labels the different arteries, veins, and organs involved in the circulatory system.
This page gives some information on the yellow perch.