FishWhat are they?

By. Alyssa, Abbey, Tessa, Adrean, Clayton, and Austin

Key Terms. Fish- a vertebrate, lives in water and uses it

fins to swim to move. Habitat- specific environment where an

animals lives. Cartilage- a tissue way more flexible then

bones. Gills- the things fish use to breathe in the

water. Swim Bladder- external gas filled sac that

helps fish stay stable at different water depths.

Fins- the things they use to flap through the water and keep up so that they can go in the direction they want to go .

Common Characteristics.

- They have scales. - 5 senses.- Very good hearing.- 5 types of fins.- Cold-Blooded. - Gills. - Gradual Metamorphosis. - Vertebrates.

Internal conditions stable. They are cold blooded. They have homeostasis which means that

they keep their level at a roughly constant level.

They are metabolic rates which means they can keep their temperature of their habitat.

In the summer if they are hot they go down to the bottom surface.

In the winter if they are cold they go to higher up in the surface.

Reproduction.

A female contains as many as 1 million eggs not all the eggs live because other fish eat them.

A chance of a baby fish or egg surviving is very low.

Some fish have external fertilization which is eggs are fertilized outside of females body.

Some fish have internal fertilization which is eggs are fertilized inside the females body. And the baby stays in the female until its ready to be on its own.

Circulatory system/ Oxygen Fish obtain oxygen by water going

through their gills. The blood vessels in the gills take the

oxygen from the water. Fish have a closed circulatory system ,

they also have a two chambered heart. The blood pumped from 1 loop from the

heart to the gills. Then to the rest of the body and back to

the heart.

Movement.

Fish move easily in water. They have fins and gills. There fins are like a canoe paddle ,

that provides a big surface, to push against the water.

Most of the movement of fish are related to obtain food and some are related to reproduction.

Types of organisms.

There are three major types of fish. There are bony fish, jawless fish, and cartilage

fish.

Jawless- they have no jaws and no scales. Ex- Hagfishes and Lampreys.

Bony- have jaws and scales, skeleton made of hard bones. Ex- Goldfish, clownfish, and catfish.

Cartilaginous- have jaws and scales and skin made of cartilage. Ex- Sharks, Rays, and Skates.

Other interesting facts.

They have colored cells! Fish have sexual reproduction. They are echinoderms. Some fish float. Some have no teeth! Fishes bodies are most made of

muscles. Fish have spiny dorsal fins.

Works cited.

Coolidge. Life science book.2009.374-380 Bobbie Kalman. Animal

Kingdom.1998.18-19 Keith Porter. Life in the Water.1996.18-26 Internet Cites. Fish.

http://www.austums.gov.au/fishes/what/what.htm

Fish. http://animals.about.com/od/fishes/a/tenfactsfishes.htm

Google. http://Badhonhara.com Fish. http://www.desultorythoughts.com