Tuesday, May 26, 2015

Fish (Perch) Dissection

Background Information
Where is it found?
The perch is a freshwater fish that is commonly found throughout the British Isles and much of Europe, South Africa, and Asia.
What does it eat?
The perch's diet consists of worms, small fish, and larvae.
How does it breath?
The perch takes in oxygen through its gills which are located on either side of its head. Water enters through its mouth and travels through blood vessels to the gills which filters out carbon dioxide.
Fun fact:
When threatened the perch raises their spiny fins as a defense against being eaten.



Gills- used for breathing 
Swim bladder- contributes to fish's ability to control buoyancy without wasting energy
Liver- acts as a food reserve 
Stomach- digests food
Heart- pumps blood to other parts of body



Use dissecting pins to secure the fish to the dissecting pan. Use scissors to make the cuts through skin and muscle. After making the cuts, carefully lift off the flap of skin and muscle to expose the internal organs in the body cavity.

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