1 / 6

Fish

Fish. What is a fish?.

willis
Télécharger la présentation

Fish

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Fish

  2. What is a fish? Fish are animals that are vertebrates (they have a backbone), cold-blooded, and live in the water. Fish lay eggs, and generally fish also usually have scales and fins, tails, and gills instead of lungs. The 25,000 known species of fish are divided into three main groups.  There are three groups of fish:  jawless, cartilaginous, and bony.

  3. Bony Fish Bony fish are the biggest group of fish making about 95% of all the species. Bony fish have a skeleton made of bone. Most bony fish have a swim bladder ,that’s a sac of gas in their bodies that helps them control depth. When the sac inflates the fish becomes more buoyant and rises in the water. When the bladder deflates, the fish becomes less buoyant and sinks

  4. cartilaginous fish Cartilaginous fish include sharks, skates and rays. They have skeletons made out of cartilage not bone. Cartilage is a rigid soft tissue. Your upper ears are made of cartilage. The brains of cartilage fish are 10 times the size of the brains of another fish. They have scales called dermal teeth on their skin, making it very rough, like sandpaper.

  5. Jawless fish Jawless fish have no jaws, just a round sucker mouth with teeth all along the inside. Jawless fish are some of the oldest fish we know of. There are fossils of them that date back to 250 million years ago.

  6. By Sara Said Are amazing

More Related