Perch Dissection

Very smelly, and very disgusting as well, but INFORMATIVE

Objectives

  • Label organs of a perch
  • List Background information
  • Understand their taxonomy, evolution, ecology, and body systems
  • Add some interesting facts

http://bioweb.uwlax.edu/bio203/2010/dorff_kell/yellow_perch_giant.jpg

Background

  • Taxonomy

Kingdom: Animalia

Phylum: Chordata

Superclass: Osteichthyes

  • Evolution

Scales that protect the perch from environment, fins that help swim, gills to breath underwater, and mucous helps escape predators fast.

  • Ecology

Perches best suited in clear water with moderate vegetation and lots of sand, mud or gravel bottoms. Predators include larger fish, such as Largemouth Bass, Smallmouth Bass, Black Crappie, or Channel Catfish. Preys can be phytoplankton, zooplankton and as well as insects that swim within the water. Perch are mostly in the third trophic level. The ecological niche of perches are mostly in freshwater lakes. Perches shares a commensalism symbiotic relationship with water buffalos, perches with eat the ticks off of the water buffalos.

Perch Cladogram

http://bioscholars2.wikispaces.com/Classification

Population

http://mrsgsbiologyclass.edublogs.org/files/2012/10/Capture-24442tp.png

Body Systems

http://www.savalli.us/BIO370/Anatomy/AnatomyImages/PerchDissectionLabel.jpg

Organ Function (Internal)

Stomach- 3 finger shaped diverticula, opens ventrally into the intestine

Aorta- supply all arteries with oxygenated blood

Dorsal Gills- used for oxygen exchanged

Operculum- covers and protects the gills, regulate flow of water

Eye- vision

Mandible- to grasp and obtain food

Bulbus Arteriosus- maintain blood flow into the gill arches

Heart- pumps blood

Liver- excretes digestive enzymes

Pyloric Caecum- a pouch connecting the large intestine between the ileum and the colon

Pancreas- consist of exocrine

Swim Bladder- fills with oxygen, sac that maintains fish pressure level

Intestines- absorption of nutrients

Gonad- male testes, produces sperm, female ovary, produces ova

Urinary Bladder- contains urine, waste

http://bentonzoology.wikispaces.com/file/view/Screen_shot_2011-03-21_at_11.27.35_PM.png/212673478/467x298/Screen_shot_2011-03-21_at_11.27.35_PM.png

External Parts of a Perch

Nares- nose, give passage to the air breathed and to secretion

Pectoral Fins- yawning, rolling

Pelvic Fins- balance

Scales- protection

Vent- take out waste

Dorsal Fin- Maneuver

Caudal- Propulsion

Peduncle- connects the Caudal

Lateral Line- alert fish from predators

Anal Fin- stabilization

Mouth- takes in food

Human Impacts

Freshwater, is the best water to have. Dumping trash in fresh water will decrease perch population with polluted water.

http://www.allskull.com/wp-content/uploads/2010/08/waterpollution.jpg

GOING BEYOND GET MORE FACTS

  • There are 6000 species of perches and 150 families.
  • Perches grows an average size of 10-20 inches.
  • There are yellow, golden, silver, and white perches.
  • Their lifestyle is known as semi-anadromous. They can be seen migrating to tidal water and during winter seasons, they usually drift in downstream portions of rivers.

  • http://www.buzzle.com/articles/perch-fish-facts.html

THE ENDOCRINE SYSTEM OF A PERCH

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. 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.