Class Osteichthyes Bone endoskeleton Thin flexible scales (______ or ______) Bony ________ pumps water across gills Most have swim bladder ______ (symmetrical) tail Protrusible jaw with terminal mouth Cycloid Ctenoid Operculum Homocercal

Class Osteichthyes: Bony Fishes

Phylum Chordata Subphylum Vertebrata Class Osteichthyes Ctenoid Scale _______ Scale Ctenoid What type of scale is this?

Phylum Chordata Subphylum Vertebrata Class Osteichthyes Cycloid Scale _______ Scale Cycloid What type of scale is this?

Phylum Chordata Subphylum Vertebrata Class Chondrichthyes Placoid Scales What type are scales are these?

1. Operculum2. Dorsal fins3. Caudal fin 4. Lateral line5. Pectoral fin 6. Pelvic fin 7. Anal fin

First dorsal fin Second dorsal finCaudal fin Anal fin Pelvic fin Pectoral fin Operculum Eye Nostril Lateral line

Gills Swim bladder Gonad Heart Stomach Intestine A. B. C. D. E. F. Liver

Heart Pyloric caeca Stomach Gonad Swim bladder Intestine Gills A. B.C. D. E.F. G.

Gills Heart Liver Stomach Intestine Swim bladder Gills Liver Swim bladder Gonad Stomach

Gills Ventricle (Heart) Liver Pyloric caeca Stomach Intestine Spleen Gills Atrium (Heart) Ventricle (Heart) Liver Gall Bladder Intestine Urinary bladder Gonad Intestine Perch Anatomy

Parts of a Typical Epipelagic Fish

1. Gills2. Kidney3. Swim bladder4. Gonad5. Urinary bladder 6. Heart7. Liver 8. Stomach9. Pyloric ceca 10. Pancreas 11. Intestine

Pharynx Behind mouth Houses gills Gill arches may be equipped with inwardly directing projections called gill rakers that aid in filtering food from the water

Esophagus, Stomach, and Intestine The esophagus is short and contains taste buds The stomach functions in storage Pyloric caeca secrete digestive enzymes. Carnivores have short intestines, herbivores have long intestines. The intestine functions in the digestion of nutrients

First dorsal fin Second dorsal finCaudal fin Anal fin Pelvic fin Pectoral fin Operculum Eye Nostril Lateral line

Gills Swim bladder Gonad Heart Liver Intestine Stomach

Heart Pyloric caeca Stomach Gonad Swim bladder Intestine Gills A.B.C. D. E.F. G.

A B

A B C C D E F G H I K L J