perch dissection

PERCH DISSECTION

Perch are bony fish, they have an endoskeleton made mostly of bone

Perch Dissection

They are covered in thick, keratin heavy scales

These help reduce friction in the water so fish can swim quickly

They also protect soft tissue from damage

Perch Dissection

Most bony fish have two eyes without eyelids

They do have a protective layer

Perch Dissection

There are 4 pairs of gills, one on each side of the head, and they are protected by an operculum

The operculum also force water over the gills to help the fish breathe

Perch Dissection

Similar to cartilaginous fish, bony fish have 5 different types of fins:

Dorsal Pectoral Pelvic Anal Caudal

Perch Dissection

Perch, like all fish possess a lateral line used to detect pressure changes

Perch Dissection

To reach the internal organs, a window is cut on one side of the fish

Perch Dissection

A perch has a complete digestive system, a closed circulatory system, and a complete reproductive system

Perch Dissection

One major difference between bony and cartilaginous fish is buoyancy

Bony fish has a normal-sized liver, and instead use a gas (swim) bladder to stay afloat

Perch Dissection

Perch have complex brains

Perch Dissection