Respiratory System

Examination of a perch by Alex Salas



Objectives Listed

Background Info

  • Scientific name
  • Habitat
  • Predators & Prey
  • Niche - Trophic Level(s)
  • Ecological adaptation/response
  • Cladogram
  • Symbiotic Relationship(s)

Dissection Picture/Video

  • External pic(s) w/ labels
  • Internal pic(s) w/ labels

1 Assigned Featured Body System

  • Organ list
  • Labels w/ pic(s)
  • In depth explanation of body system
  • ID closely associated body systems

Extra Info

  • Interesting fact(s)
  • Current news/educational websites

Perch Details


Kingdom: Animalia

Phylum: Chordata

Class: Actinopterygii

Order: Perciformer

Family: Percidae

Genus: Perca

Species: Perca falvescens

Evolution: It went from a jawless fish to the first fish w/ lungs then to a jawed fish w/ hinge between skull and trunk and finally a ray-finned fish, also known as a perch.

Ecology Roles: The perch is a predator to aquatic insects and other smaller fish but can be preyed upon by larger animals such as the smallmouth bass and largemouth bass, etc.

Habitat: It lives around just anywhere that has lots of vegetation and water. They come to shallow waters at dusk or dawn to feed.

Backround Information

Scientific Name: Perca flavescens

Habitat: Slow-moving rivers, deep lakes and ponds where it stays close to patches of vegetation and submerged objects.

Predator & Prey: The predators of the perch include larger fish, such as Largemouth Bass, Smallmouth Bass, Black Crappie, etc. The prey of the perch include aquatic insects, small fish, insects, crayfish, snails, mussels, leeches, fish eggs, and worms.

Niche - Trophic Levels: It is prey to some animals and a predator to some as well, so it keeps a flow in it's ecosystem. Its trophic level is in the middle due to the fact that it is prey and a predator.

Ecological Adaptation/Response: Perch adapt to their environment by having a streamline body to cut through the water, they have gills to help them breathe under water and some perch even use camouflage to disguise themselves underwater.

Symbiotic Relationships: Parasitism, when a lamprey eel fastens itself to a host fish, such as a perch, and feeds on it. When the fish dies the eel finds another host.

The Respiratory System

Organ List: Gill raker, Gill arch, Gill filaments, Lamellae with capillary networks.

In depth explanation of body system: Water passes from the gill arch over the filaments, water passes the lamellae in a direction that is opposite to the direction of blood flow through the lamellae. The success of the gill's operation critically depends on this countercurrent flow of water and blood.

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Fun Facts

Yellow perch (Perca flavescens) are members of the Percidae family of freshwater fish, which consists of hundreds of species, some of which are unarguably among the best-tasting freshwater fish available.

The best fishing locations are often the weedbeds in shallow lakes, where it is advisable to fish on or close to the bottom.