The life of a perch
perch dissection-PAPBio-3rd per
represented by: MOJDE YADOLLAHIKHALES
Objectives
learn about the external and internal anatomy of a perch. Focus on the organs, structures, and functions of the circulatory system. Understand the ecological role of the perch.
Perca flavescens
The yellow perch commonly referred to as perch, is a freshwater fish native to much of North America. Other common names for yellow perch include American perch, lake perch, raccoon perch, ringed perch, and striped perch. Zooplankton is the primary food source for young and larval perch. large adult perch feed on invertebrates, fish eggs, crayfish, shrimp, and fish. The yellow perch has many adaptations to allow it survive in diverse conditions. Perch also have specialized teeth called palatines that they use to eat other small fish like minnows and even some insects. They can also filter out zoo plankton with their gill rakes. Perch is in the class Osteichthyes since it has bony skeleton.
Habitat
Adult yellow perch inhabit slow-moving, near-shore areas where moderate amounts of vegetation provide cover, food and protection.
Life cycle
yellow perch eggs hatch in about two weeks and it reach maturity in one to three years.
Predator
Yellow perch are widespread and good to eat. They provide forage for many other species of fish such as black crappie, channel cat fish or birds such as hawks and kingfishers.
Taxonomy & Evolutionary relation ships of perch
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Perciformes
Family: Percidae
Genus: Perca
Phylum: Chordata
Class: Actinopterygii
Order: Perciformes
Family: Percidae
Genus: Perca
Species: flavescens
PERCH DISSECTION
External anatomy:
Fins- 2 dorsal fins, 2 pectoral fins, 2 pelvic fin, an anal fin, and a caudal fin
Gill Opening- where the water goes so that the fish can get its oxygen
Operculum- cover and protect the gills
Lateral Line- a sensory organ that has sacs filled with fluid with hair-like sensors that are open to the water through pores, it senses pressure, currents, and movement in the water
Internal anatomy:
Dissection
To expose internal organs, you should cut away part of its muscular wall.
Gills
Gills are behind the flap of skin, above heart. A perch has 3 layers of gills per side.
Eyes
As with most fish, perch do not have eyelids. They are, however, covered by a layer of transparent integument or coating to keep the eye protected.
Stomach
Dilated section of the digestive tract preceding the intestine; it receives food to be digested.
Air bladder
Air bladder contains gas and help the fish to maintain its depth without floating upward or sinking.
Heart
The heart consists of one atrium and one ventricle. Oxygen poor blood is pumped through the heart and into the lungs. Once the blood has been oxygenated it then goes directly to the tissues and back to the heart.
Circulatory system
The circulatory system of the perch is a typical low pressure single type system in which the heart is a single pump and there is a single circuit of blood flow. Venous (deoxygenated) blood from the body is pumped through the heart forward to the gills. From the gills, where it is oxygenated, the blood goes directly to the body. Thus the blood makes a single circuit during which it is pumped, oxygenated, and distributed to the body, before it returns to the heart. In this pattern of circulation the heart pumps only deoxygenated blood. To prevent the back flow of blood from occurring there are valves that keep the blood flow moving in one direction.
Fun facts
- The perch uses its fins as a defense when threatened
- Have a unique spawning method, the females release their eggs in long gelatinous strands that usually hang from vegetation
- Swim Bladder: the bladder can fill with air to help the fish float to the surface without swimming, and can deflate with air to help the fish float down without swimming
- Have a unique spawning method, the females release their eggs in long gelatinous strands that usually hang from vegetation
- Swim Bladder: the bladder can fill with air to help the fish float to the surface without swimming, and can deflate with air to help the fish float down without swimming
Cited websites
- www.perchinfo.com
- www.animalplanet.com/fish/perch-info.htm
- www.dnr.state.md.us/.../yello...
- https://www.seaperch.org/
- http://www.utoledo.edu/as/lec/images/fishery/perch.png
- http://animaldiversity.ummz.umich.edu/site/accounts/information/Perca_flavescens.html
- http://www.smithlifescience.com/ComparativeAnatomy.htm
- http://kentsimmons.uwinnipeg.ca/16cm05/16labman05/lb8pg11.htm