Playing with Perch

Perch Dissection Vu PAP Biology April 7, 2014

PERCA FLAVESCENS

Perch belong to the Kingdom Animalia ; phylum Chordata; classified as Osteichthyes or bony fish; belong to the large order of vertebrates,Perciformes;and the family Percidae. Their light colored stomachs help them hide from predators lurking beneath and their colorations help them hide amongst the vegetation they call home. The perch's fins help them swim and navigate without rolling over in the water's currents. The body shape also helps them swim better in the water.Their strong jaw allows to capture prey easier. Perch also posses a swim bladder which regulates oxygen levels and allows to the fish to possess buoyancy so they can rise or sink.

Objectives

Students will learn about the general anatomy of perch through dissection. They will be able to label the main organs and know what they look like. The circulatory system will be focused upon and researched.

Habitat, Prey, and Predators

Perch live in the many different aquatic environments but typically reside among the shorelines of freshwater lakes or rivers where vegetation grows. They have also been known to have adapted to salty water.But clear or open water is important as silt can build up and cause blockage of gills.The vegetation provides shelter and food. Young perch feeds on zooplankton while adult perch also prey on smaller fish, insect larvae, and crustaceans. Predators include larger carnivorous fish like the largemouth and smallmouth bass, bowfins, and lake trouts. Bird like gulls, kingfishers,eagles and herons also prey on perch. Perch play important roles of prey and predator in their ecosystems. So they can be located at the primary trophic level when they are younger, but gradually ascend to the secondary or tertiary level.
Bony Fish (Perch) Anatomy
Perch play an important role in fisheries. They bring tourism and play roles as a recreational sport. Their populations have fluctuated due to their rapid reproduction but have also declined because of overfishing, and competition with other fish species. Because most perch live in freshwater lakes there is no open water to bring in other food sources or nutrients.

Cladogram

The Crazy Circulatory System of Perch

A perch's circulatory system is a low pressure closed system meaning there is a single loop through which the blood travels from heart---> gills---> organs---> heart. The heart acts as a single pump which pumps the deoxygenated blood . Then the blood flows to the gills where it becomes oxygenated and distributed to the rest of the body and then travels back deoxygenated, to the heart.The circulatory system's function is to keep the fish's blood circulating and the fish breathing. The fish's blood pressure is maintained by their constant movement in their watery environment.

Organs

Two chambered heart (sinus venous, bulbous arteriosus, atrium and ventricle)- keeps the blood pumping and flowing through the single loop system. The atrium is the upper chamber of the heart and circulates the blood to the ventricle.

Gills- oxygenates the blood

Arteries(efferent branchial arteries,afferent branchial arteries, ventral aorta, intestinal artery, gonadal artery,pneumatic artery,dorsal aorta, and celiac artery)

- Carries and circulates oxygenated blood through out the body and organs from the heart

Veins(hepatic portal vein, intestinal vein, left posterior cardinal vein, and right cardinal vein)

- Carries the deoxygenated blood to the heart

Capillaries - The capillaries send the oxygenated blood from the arteries to the tissue of the

fish and send the deoxygenated blood from the fish's tissue into the veins.