Perch Lab

Pre-AP Bio - Period 7 - VU 4/8/2014

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Perca flavescens

Perch's are freshwater fishes that belong in the Kingdom Animalia, Phylum Chordata, and Subphylum Vertebrata. The name Perch comes from the Greek "perke" meaning spotted and "flavescens", from latin meaning becoming gold colored.

Perch are carnivorous fish that are most commonly found in the spring in small ponds, lakes, streams, or rivers. These fish feed on smaller fish, shellfish, or insect larvae. Although Perch's can be found all over the world, they are most likely found in the Great Lakes, particularly in Lake Eerie.

did you know?

Perch "spawning" season is between April and May in shallow water?

The female is larger than the male?

The male is distinguished as darker in color with an endy anal fin?

The parent perch's have to eat the eggs after hatching?

Today's Objective

Students will be learning about the external and internal anatomy of a Perch (Yellow Perch).

Students will focus on the organs, structures, and functions of the endocrine system. Students will also understand the ecological role of the Perch.

Ecology

Perch's mainly occupy the 2nd trophic level (primary consumers), and are usually active during the day except during spawning. Perch are most often found in schools, however younger perch's are found to travel in schools more often than older perch's. Younger perch's feed primarily on zoo plankton, and older perch's mostly feed on crayfish, mysid shrimps, and other juvenile fishes. The population of perches today isn't very large, only at around 160 million.

Perch Evolutionary Relationships

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Perch Dissection

Endocrine System Overview

The Perch's Endocrine System contains the pituitary, the thyroid, the suprarenals, the pancreatic islets, the sex glands (ovaries and testes), the inner wall of the intestine, the ultimobranchial gland, but no adrenal gland. There are in fact other glands and structures, but more research needs to be done since their functions are not yet understood. In short, these organs regulate sexual activity and reproduction, growth, osmotic pressure, general metabolic activities such as the storage of fat and the utilization of food, blood pressure, and certain aspects of skin color.

Human Impact

Perches have always been fished by humans. In result, with a combination of human manipulation over navigable rivers such as the Nile and fishing, the ecosystems of the perch has been disrupted greatly.