Dive into the Perch Perspective

Perch Dissection: PAP Biol - Vu 7 - April 6, 2014 - J Chen

Objectives

Students will be able to dissect a perch and discover the internal anatomy of a vertebrate. They will explore the perch's organs and understand the function(s) of each.

"Perching" on Information

Perch, also known as Perca fluviatilis, live in shallow vegetated ponds, streams and lakes. The perch is prey to larger fish such as smallmouth bass, northern pike, and lake trout and is predator to water-fleas, copepods, small fish and other small crustaceans. A perch's niche resides to it eating plant matter, providing carbon dioxide to aquatic plants, and maintaining the stability in the underwater ecosystem. It has adapted to its aquatic environment by developing gills to help it breath underwater, scales to keep its streamlined body swift in movement, and unique coloration specific to itself for camouflage and protection.

The Circulatory System

The circulatory system of a perch is single looped and consists of the following organs: heart, atrium, ventricle, bulbus, and artieriosus. Because fish are constantly swimming to maintain blood pressure, the heart needs to keep the blood flowing and the blood circulating in the single loop. The ventricle and atrium in heart create its two chambers. The blood enters the gills of the fish, distributing oxygenated blood and the veins deliver deoxygenated blood back to the heart. Branching off veins are capillaries that essential in delivering the deoxygenated blood from the tissues of the fish back to the veins. Gills are also essential to the circulation of blood in the circulatory system because this is where blood becomes oxygenated once again. This body system relates to other systems in that it is needed to

Fishing for Facts...

-The oldest perch in Maryland's portion of Chesapeake Bay reached 15 years of age before it died.

-Perch are closely related to striped bass.

-The female perch is typically larger in size compared to the male.

-Perch spawn in shallow waters.

-The perch can be either omnivorous or herbivorous.