Class Osteichthyes Bone endoskeleton Thin flexible scales (______ or ______) Bony ________ pumps water across gills Most have swim bladder ______ (symmetrical)

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 ChordataSubphylum VertebrataClass Osteichthyes

Ctenoid Scale_______ ScaleCtenoid

What type ofscale is this?

Phylum ChordataSubphylum VertebrataClass Osteichthyes

Cycloid Scale_______ ScaleCycloid

What type ofscale is this?

Phylum ChordataSubphylum VertebrataClass Chondrichthyes

Placoid Scales

What type are scales are these?

1. Operculum2. Dorsal fins 3. Caudal fin

4. Lateral line 5. Pectoral fin6. Pelvic fin

7. Anal fin

1

2

2

3

4

5

6

7

First dorsal finSecond dorsal finCaudal fin

Anal fin Pelvic finPectoral fin

Operculum Eye

Nostril

Lateral line

Gills Swim bladderGonad

HeartStomach Intestine

A. B.C.

D.E. F.

Liver

Heart Pyloric caeca Stomach

GonadSwim bladder

Intestine

GillsA. B. C.

D.E. F.

G.

Gills Heart Liver

Stomach

Intestine

Swim bladder

GillsLiver

Swimbladder Gonad

Stomach

1. 2.3.

4.

5.

6.

7.8. 9.

10.

Gills

Ventricle (Heart)

Liver

Pyloric caeca

Stomach

IntestineSpleen

Gills Atrium(Heart)

Ventricle (Heart)

Liver

GallBladder

Intestine

Urinary bladder

Gonad Intestine

PerchAnatomy

Parts of aTypicalEpipelagicFish

1. Gills 2. Kidney 3. Swim bladder 4. Gonad 5. Urinary bladder

6. Heart 7. Liver 8. Stomach 9. Pyloric ceca 10. Pancreas 11. Intestine

1

2

3

3

4

5

6

7

89 10

11

8

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 finSecond dorsal finCaudal fin

Anal fin Pelvic finPectoral fin

Operculum Eye

Nostril

Lateral line

Gills Swim bladderGonad

HeartLiver IntestineStomach

Heart Pyloric caeca Stomach

GonadSwim bladder

Intestine

GillsA. B. C.

D.E. F.

G.

A

B

A

B

C

C

D

E

F

G

HI K

L

J