Looking inside A Perch Lab

Made By Annie Tao, Ms. Guzman, Pd:6


The objective for this lab is to allow the students to learn and familiarize the parts of the perch.

Background Information

The perch's scientific name is called Perca flavescens, and member of the phylum Chordata. Perch live in ponds, lakes, and streams. The predators of the perch are predatory birds (eagles), other larger fish (bass, catfish), some turtles, and snakes. The perch eats crayfish, earthworms, mussel, mosquitoes, and beetles. The perch's role in the ecosystem is to control the population of immature insects, larger invertebrates, and smaller fish. The perch adaptations are large eyes to feed by sight, stripes to hid against weeds for protection or ambush prey, and a light colored belly so predators will be able to see the perch. The perch is tolerant of the kind of water the perch lives in. The changes in temperature, salinity, alkalinity, etc does not affect the perch.

Human Influence

The perch used to be an invasive species in North America in order to be used by humans as sport fish. Since the perch is tolerant to changes in salinity and temperature changes, the perch can dwell in various environments. Now since the perch population has grown so high, humans are trying to control the perch population by stocking on piscivorous fish to reduce the impact of yellow perch. Other than that, the perch population goes rather unchanged.

Perch Circulatory System

The perch has a two chambered heart with a saclike sinus venosus and a muscular tube bulbous arteriosus. The perch has a single atrium and ventricle. Blood comes through the heart from the sinus venosus, and passed through the atrium, and then to the ventral aorta. Blood flows to the gills to receive oxygen and exchange with CO2. Then the blood goes to the rest of the body and back to the heart. The circulatory works with the respiratory system to exchange the CO2 to O2 in the blood cells and with the muscular system to provide the muscles with oxygen and nutrients to allow the muscles to function properly. The circulatory system works with the digestive system by allowing the blood cells get the nutrients from the digestive system and give it out to the other parts of the body.
The circulatory of a perch.

Website: http://images.sciencesource.com/preview/BM4235.html

Extra Information

The perch spawning is unique, and the perch lay the eggs in long, connected ribbons. The perch do not care for the eggs and will even eat the eggs if necessary. The perch is carnivorous and will get just about anything that can be swallowed by their mouth. A single perch can live up to 9 or 10 years.