Fishes: The First Invertebrates

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created 9 years ago by franagraber
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1

Three types of fishes still living today:

Jawless fishes, cartilaginous fishes and bony fishes.

2

Jawless fishes...

...have smooth skin, and a round jawless mouth.

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Jawless fishes hagve no jaws...

...because they don't need to bite or chew.

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In the cartilaginous fishes...

...the original cartilage does not turn in to bone throughout its life.

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Cartilaginous fishes have...

...fully functional jaws.

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All cartlaginous fishes...

...have excelent senses of smell and sight. They also have lateral line symmetry.

7

To say afloat, cartilaginous fishes...

...store oil in their livers. If they stop swimming, they sink. Some also need to keep on swimming to breathe, orelse they suffocate.

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Most of the fishes..

...are bony fishes.

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To stay affloat...

...they use a balloonlike organ: the swim bladder. The swim bladder is filled with gases, that are lighter than water, therefore making them able to stay put. It is also called a gas bladder.

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There are two types of bony fishes...

...the ray-finned fishes and thye lobe-finned fishes.

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Ray-finned fishes have...

...paired fins supported by thin rays of bone. They make up most of the bony fishes

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Lobe-finned fishes have...

...