Perch Dissection Flashcards
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Questions and Answers

Perch belong to what class of bony fish?

Osteichthyes

Are perch ray-finned or lobe-finned fish?

ray-finned

Name the fins found on a perch.

pectoral fins, pelvic fin, anal fin, caudal fin, dorsal fins

What is the function of the pectoral fins?

<p>control movement (up &amp; down)</p> Signup and view all the answers

What is the function of the caudal fin?

<p>propels the fish through water</p> Signup and view all the answers

What is the function of the dorsal fins?

<p>stabilizes the fish</p> Signup and view all the answers

What is the function of the pelvic fin?

<p>directs movement</p> Signup and view all the answers

What is the function of the anal fin?

<p>stabilize's movement</p> Signup and view all the answers

Do the pectoral fins have spines?

<p>False</p> Signup and view all the answers

Location of the pectoral fins?

<p>ventral</p> Signup and view all the answers

Does the caudal fin have spines?

<p>False</p> Signup and view all the answers

Where is the caudal fin located?

<p>posterior</p> Signup and view all the answers

Do the dorsal fins have spines?

<p>True</p> Signup and view all the answers

Where are the dorsal fins located?

<p>dorsal</p> Signup and view all the answers

Does the pelvic fin have spines?

<p>True</p> Signup and view all the answers

Where is the pelvic fin located?

<p>ventral</p> Signup and view all the answers

Does the anal fin have spines?

<p>True</p> Signup and view all the answers

Where is the anal fin located?

<p>ventral</p> Signup and view all the answers

Give the function of the swim bladder.

<p>The swim bladder gives the fish buoyancy allowing it to sink or rise in the water.</p> Signup and view all the answers

Describe the external appearance of a yellow perch.

<p>The sides of the yellow perch are golden yellow to brassy green with 6 to 8 dark vertical saddles and a white to yellow belly.</p> Signup and view all the answers

What is the scientific name for the yellow perch?

<p>Perca flavescens</p> Signup and view all the answers

Describe spawning of yellow perch.

<p>Yellow perch spawn from mid-April to early May by depositing their eggs over vegetation or the water bottom with no care given.</p> Signup and view all the answers

Name several organs that belong to the digestive system.

<p>swim bladder, intestines, anus, stomach, pyloric caeca, pancreas, urinary bladder</p> Signup and view all the answers

Describe the heart of a perch & explain blood flow through this organ.

<p>The two-chambered heart pumps blood through a closed circulatory system. Blood enters auricle &amp; is pumped back out through the ventricle.</p> Signup and view all the answers

Are both jaws of the fish equally movable?

<p>False</p> Signup and view all the answers

Does the perch have eyelids?

<p>False</p> Signup and view all the answers

How many gills are located on each side of the perch?

<p>2</p> Signup and view all the answers

What covering protects the gills?

<p>opercula</p> Signup and view all the answers

What is the function of the gill rakers?

<p>Gill rakers assist in feeding by preventing stray particles from exiting through the gills.</p> Signup and view all the answers

Which fin is the largest?

<p>Dorsal fin</p> Signup and view all the answers

What is the function of the lateral line?

<p>It allows the fish to determine the direction and rate of water movement.</p> Signup and view all the answers

Describe how the scales are arranged on the trunk & tail of the perch.

<p>The posterior end of each scale covers the anterior end of the next scale.</p> Signup and view all the answers

Explain how the swim bladder controls buoyancy.

<p>When gas is added to the swim bladder, the fish becomes less dense. When gas is removed it becomes more dense.</p> Signup and view all the answers

Study Notes

Perch Classification

  • Perch are classified under Osteichthyes, the class of bony fish.
  • They are categorized as ray-finned fish.

Fins of Perch

  • Fins present on a perch include pectoral fins, pelvic fin, anal fin, caudal fin, and dorsal fins.
  • Pectoral fins control vertical movement.
  • The caudal fin propels the fish through water.
  • Dorsal fins stabilize the fish during swimming.
  • Pelvic fins direct movement, while anal fins stabilize movement.
  • Pectoral, caudal, and anal fins do not have spines; dorsal and pelvic fins possess spines.
  • Pectoral and pelvic fins are located ventrally (on the underside), while the caudal fin is located posteriorly (at the back) and dorsal fins are found dorsally (on the back).

Buoyancy and Swim Bladder

  • The swim bladder provides buoyancy, allowing the fish to control its depth in water.
  • Changes in gas volume in the swim bladder adjust the fish's density, impacting buoyancy.

External Appearance

  • Yellow perch exhibit golden yellow to brassy green coloration on their sides with 6 to 8 dark vertical saddles, and have a white to yellow belly.

Reproduction

  • Spawning occurs from mid-April to early May, where eggs are released over vegetation or the water bottom without parental care.

Digestive System

  • Key digestive organs include swim bladder, intestines, anus, stomach, pyloric caeca, pancreas, and urinary bladder.

Circulatory System

  • The perch has a two-chambered heart, comprising an auricle and a ventricle, circulating blood through a closed system.

Jaws and Gills

  • Only the lower jaw is movable, while the perch lacks eyelids.
  • Each side of the perch has two gills, protected by opercula.
  • Gill rakers help filter food particles, preventing debris from escaping through the gills.

Other Features

  • The largest fin on a perch is the dorsal fin.
  • The lateral line system detects water movement direction and rate.
  • Scales on the trunk and tail overlap with the posterior end covering the anterior end of the next scale.

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Test your knowledge on perch anatomy and classification with these flashcards. Learn about their fins, movement functions, and place in the bony fish class. Ideal for students studying marine biology or fish anatomy.

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