Swimming Circles on the Inside

By: Ania Lewis ~ Ms. Vu - PAP Biology - Period 4th

Perch Circulatory System


  • We will explore the internal and external parts of a perch

  • We will cover the organs and other parts of the perch

  • We will learn the functions and locations of these organs

  • We will study the structure and functions of perch

Background Information

  • The scientific name for a perch is Perca flavescens

  • Perch live in rivers

  • Preyed on by larger fish such as pike, largemouth bass, humans

  • Eats algae, plankton, and some small fish (secondary consumer)

  • Taxonomy:

      • Kingdom: Animalia

      • Phylum: Chordata

      • Class: Actinopterygii

      • Order: Perciformes

      • Family: Percidae

      • Genus: Perca

      • Species: Perca flavescens

  • Evolution:

      • Scales protect the fish from its environment

      • Perch have special teeth used for eating smaller fish

      • Small filters found within the gills have the ability to filter out zooplankton

      • Perch are able to mask their scent using chemicals and hide in plain sight

  • Human Impact/ Influence:

      • Humans catch fish as a food source

      • Humans pollute waters that could kill the animal

      • Perch help keep the population of aquatic animals stable

      • Parts of the perch are used in the making of products such as leather

Circulatory System

Organs: heart (2 chambers), atrium, ventricle, dorsal aorta, jugular vein

  • Heart- organ that pumps blood and maintains circulation throughout the body

  • Atrium- receives oxygen rich blood

  • Ventricle- pumps blood to the entire body

  • Dorsal aorta- carries blood from heart to all of the organs.

  • Jugular vein- carries blood from head to face

  • When blood enters the heart, it enters through the atrium and exits through the ventricle. The blood is then pumped throughout the whole body with assistance from the dorsal aorta and the jugular vein.

Heart is found just behind and below the gills

Extra Information

  • The operculum cover and protect the gills

  • Perch fish don’t have eyelids

  • Perch have 4 layers of gills

  • The area around the gullet and the opening of the esophagus is very elastic in order to allow the fish to turn its tail and body to steer through the water

  • Fish have swim bladders to allow the fish to sink or float