Characteristics of Bony Fish Class Osteichthyes are jawed

Characteristics of Bony Fish �Class Osteichthyes are jawed fish with bone skeletons. �Most have a swim bladder, scales, fins, gills and a tail. �Most control buoyancy by adding or releasing gas to/from their swim bladder. 5 -1

Swim Bladders �They control the swim bladders with oxygen gas exchanged to and from blood circulation. �Many have a special organ called the gas gland the rete mirabile that take up gases from the bloodstream for the swim bladder. �This allows many species to hover nearly motionless in midwater.

Fish Reproduction �Most bony fish reproduce externally. �The female lays her eggs, the male immediately fertilizes them. �Their strategy is to produce a vast number of off-spring with only a few expected to survive to maturity.

Characteristics of Bony Fish (continued) �Bony fish have characteristics for life on the reef and for life in the open ocean: �Bony fish have lateral lines that detect water motion and vibrations. �Most open ocean and schooling fish have a torpedo-like streamlined shape that minimizes drag and turbulence. � This fusiform shape is spindle-like, slightly broader at the head and a V-shaped tail. This makes them fast swimmers. 5 -4

Coloration of Fish �Most open-ocean and schooling fish have a lighter underside and dark topside for concealment. This is called Counter Shading. �Bony fish living in reefs and on the bottom use survival strategies more diverse and include concealment and armor instead of swimming. �For this reason, you see far more diversity in color, shape, and size among reef and bottom fish.

Figure 8. 08 b

Figure 8. 12 b

Figure 8. 14 b

Figure 8. 15 Fish Circulation

Figure 8. 17 c

Figure 8. 17 e

Figure 8. 18 a

Figure 8. 18 b

Figure 8. 19

Figure 8. 21 a

Figure 8. 21 b

Figure 8. 21 c

Figure 8. 21 d

Figure 8. 22

Pg. 164

Figure 8. 24

Figure 8. 25

Figure 8. 28

Figure 8. 13 a

Figure 8. 09 a

Figure 8. 09 b

Figure 8. 09 c

Figure 8. 09 d

Figure 8. 09 e

Figure 8. 09 f

Figure 8. 09 g

Figure 8. 09 h

Figure 8. 09 i

Figure 8. 11 a

Figure 8. 11 b

Figure 8. 11 c

Figure 8. 11 d

Figure 8. 13 b

Figure 8. 13 c

Figure 8. 13 d

Figure 8. 13 e