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Transcript of Osteichthyes
-They have an external skeleton that helps protect the internal organs (Exoskeleton)
- Most have scales
-Skin has mucous glands and embedded dermal scales.
Ectothermic or Endothermic?
By: Yoana, David and Logan
Vol XCIII, No. 311
Animals in Class
Heart of an Osteichthyes
Long, cylindrical fish with a prominent backbone that flexes upward into a rounded tail.
dorsal fin has 46 to 50 soft rays; it extends more than half the length of its back
a 2 chambered heart
-Their hearts have
arteries and veins
-The aortic arches are in their
Flying Fish- Interesting Example
-They are not to be found in cold climates.
-They have been created with large fins, which spread out in the air like wings of a glider and enable the fish to glide through the air.
Seahorse- Atypical Example
- Unlike most other fish, they are monogamous and mate for life
-Male births the young
Most fish of the Osteichthyes class depend on the surrounding environment for their body temperatures.
can produce their own body heat.
3. Dorsal and Anal Fin-
help fish stay striaght in water and keep it from rolling.
2. Pelvic and Pectoral Fin-
Used from balancing and turning
1. Caudal Fin-
Propels the fish through water
1.Water goes into gill chamber in fish's mouth
2. Water exits through gill opening under operculum
3. Blood flowing through gill filaments absorbs oxygen
Gills-what fish use to breath
Operculum- keeps unwanted water out of gills
Swim Bladder- gas filled organ
maintains right amount of water for certain
-Their able to see in color unlike other fish
-They are the most diverse and numerous of all vertebrates
-over 20,000 species of fresh and salt water bony fish.
-Bony fish mostly reproduce externally
-some are hermaphrodite
-use eggs and milt
-A few species are unisexual
-internal reproduction is in some species but very rare
Oviparous bony fishes-
one parent fertilizes
egg in their body
retains fertilized eggs in
their ovary or uterus
Unique Evolutionary Innovations/Effect on Organism
-only fish to have developed bones
-add diversity to water life
-control level of parasites and smaller fish in ocean
-are a source of food to humans and larger fish
-help keep the balance of diversity in the oceans