PONDERING THE PERCH

Perch Dissection Lab by: mariam moini,Mitcham P2

ObJectives

The purpose of the the perch dissection is to learn the internal and external anatomy of the perch.The viewer will also be able to take a better look into the circulatory system of the perch.

Background information on PERCHS

Scientific Name

The scientific name of the gray perch is the Perca flavescens.


Prey/Predators

Perch fish will eat microorganisms that float in the water in lakes, ponds or streams where they live. The yellow perch will also eat aquatic insects,crayfish,and other small fish. The yellow perch is a common prey to many fish eating fishes, including large mouth and small mouth bass,northern pike,,musky, walleye, bowfins, burbot, lake trout, and others.


Habitat

Most Perch species are adaptable to any form of habitat.However,a perch is best suited in clear water with moderate vegetation and lots of sand,gravel bottoms.The Yellow Perch in particular,has an appetite for aquatic insects,crayfish,and other small fish.Lives mainly in lakes and other places where fresh water is present.The Perch can be found throughout the British Isles and much of Europe, South Africa, Australasia and Asia. White perch are semi-anadromous members of the family, Moronidae, that migrate to tidal fresh and slightly brackish waters each spring to spawn.


Taxonomy

  • Kingdom: Animalia
  • Phylum: Chordata
  • Class: Actinopterygii
  • Order: Perciformes
  • Family: Percidae
  • Genus: Perca


Fun Facts

  • This fish has two dorsal fins, the first is armed with long sharp spines, and only the first spine of the second dorsal is sharp.
  • The perch has rough scales that are rough to the touch, and the gill plate culminates in a sharp bony spike.
  • Perch fish are freshwater species belonging to the family Percida.
  • Hatching occurs 11-27 days after fertilization, depending on water temperature.
  • White perch eggs take 2 to 5 days to hatch. When they first hatch, the tiny young are called prolarvae.
  • White perch are normally found along the Atlantic coast of North America from New Jersey to South Carolina. They have been introduced into Lake Erie and Lake Ontario, and many smaller lakes.
  • White perch become adults when they are 2 to 4 years old, and males are 72 to 80 mm long and females are 90 to 98 mm long. When there are many fish in an area, they may not grow as large
  • The largest white perch caught in Maryland's portion of Chesapeake Bay weighed 2.6 pounds.
  • The oldest white perch in Maryland's portion of Chesapeake Bay was fifteen.

CIRCULATORY SYSTEM OF A PERCH

In the perch's circulatory system,the heart consists of one atrium and one ventricle. Oxygen-poor blood is pumped through the heart and to the lungs. After it is oxygenated, it goes directly to the tissues. It then travels back to the heart.

  • Heart- muscular organ helping blood to circulate
  • Atrium- thin wall layer in heart that assists in the circulation of blood
  • Ventricle- thick wall layer in heart that assists in the pumping of blood
  • Gills- respiratory and excretory organs (four pairs) each formed of two layers of filaments; they enable water to exchange oxygen and ammonium as it circulates over the gills. As water enters through a flap of the gill, large particles are removed by structures called gill-rakers. Then the water reaches the filaments and are converted to aid the perch in respiration as well as circulation.
  • Gills are also useful in the Respiratory System as they help the perch breathe.

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How Perchs' Affect tHEir surrounding world

White perch are important to their ecosystem both as predators and as prey,Because they are an invasive species in some areas, white perch may have negative effects on native fish that are economically important.White perch are important to humans as a source of food and recreational fishing.