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Do fish have eyelids? |
The Class Osteichthyes:
Lobe-finned fish 
Known only as a fossil until 1938.
Has paddle-like fins with a fleshy base.
Lungfish
Have lungs, internal organs for gas exchange between air and the blood.
Only a few species are known.
Ray-finned fish
Fins are supported by stiff rays and/or bony spines.
All other bony fish, both freshwater and saltwater, are in this group.
Types of scales and body movement:
Types of fins and the motion they produce:
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Dorsal - top of body - helps keep the body upright. Caudal - the "tail fin" - provides forward motion. Anal - located just anterior to anus - helps keep the body upright. Pelvic - paired fins on ventral surface - turns fish left or right and backward. Pectoral - paired fins behind the gills - moves fish up or down. Adipose (catfish & trout) - a fleshy fin between dorsal and caudal fins - no motion.
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Lateral line:
Chromatophores: structures containing pigment to provide color patterns.
No eyelids:
Gills: 
external tissue rich with blood vessels to exchange gases with the water.
Swim bladder: 
A thin-walled sac along the top of the abdominal cavity containing a mixture of oxygen, carbon dioxide, and nitrogen obtained from the bloodstream.
The swim bladder usually produces neutral buoyancy, but some fish are able to adjust their buoyancy by slightly changing the amount of gas in the swim bladder.
Almost all fish have a swim bladder. Those without one, like sharks and freshwater darters, sink if they stop moving their fins.
Yes, fish can talk! 
The circulatory system of simple vertebrates:
Ventricle - the pumping chamber.
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Spawning: the external fertilization of fish eggs.
In many Oklahoma fish species, the male uses his fins to make a depression to use as a "nest".
He then tries to guide a female to the nest to release her eggs.
He swims over the eggs and releases his milt, a fuid containing the sperm. This "external fertilization" is inefficient, but having the eggs in the depression helps.
In most cases, the female will guard the nest until the eggs hatch. After that, the hatchlings are on their own.
Concept Understanding: 
- What's so special about coelacanths?
- In what parts of the world are lungfish found?
- How does a swim bladder affect the way a fish swims?
- How can the age of a fish be determined by its scales?
- What human sense organ serves a purpose similar to that of the lateral line of a fish?
- Based on the size of the brain parts, how do fish get most of their information about their surroundings?
- Based on their function, how do you think the muscles that make up the heart atrium are different from the muscles of the heart ventricle?
Research Links:
