"Goldfish" animal PPT courseware

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"Goldfish" animal PPT courseware

where do goldfish live

There are also many small animals living in the water, fish being a common one.

There are many types of fish. Common fish include:

Black carp, grass carp, silver carp, bighead carp (four major species of fish), crucian carp, carp, goldfish, yellow croaker, hairtail, shark, grouper, etc.

Goldfish generally refers to goldfish (carps)

Goldfish originated in China,

Genetic research on the domestication of goldfish began in the 12th century. After a long period of cultivation, the varieties have been continuously optimized.

Goldfish from all over the world are now directly or indirectly introduced from China.

In the history of human civilization, Chinese goldfish have accompanied humans for more than ten centuries and are the earliest species of ornamental fish in the world.

Thanks to the efforts of generations of goldfish breeders, Chinese goldfish are still performing the legend of beauty between movement and stillness to the world.

Goldfish and crucian carp belong to the same species

Goldfish, also known as "golden crucian carp", is similar to carp, but has no mouth and whiskers. It is an ornamental fish that evolved from crucian carp.

There are many varieties of goldfish, with colors including red, orange, purple, blue, ink, silver, five-flowered, etc. They are divided into four categories: literary type, grass type, dragon type, and egg type.

The characteristics of goldfish I observed are as follows:

Has a head, chest, abdomen, and tail

Live in water and breathe with gills

The body has scales

Paddling with fins

What do these forms have to do with their lifestyle? How do goldfish breathe and eat?

Think: What are the functions of fish’s gills and fins? What do scales do?

The gills of fish are the organs used for breathing

The fins of fish are organs of movement.

The scales protect the fish body and keep the fish's surface moist.

Observe goldfish feeding

Prepare some fish food or bread crumbs, gently put a few pellets in the fish tank, and observe how the goldfish eats the food.

How do goldfish eat?

After the goldfish sees the food,

Open your mouth and suck the food in,

Then use the teeth in your mouth

Chew properly,

Swallow it into your stomach for digestion,

until excretion.

Why don’t fish blink?

Because fish have no eyelids. Fish have no eyelids, and most fish have no muscles on their heads. Mammalian eyes rely on muscles to drive the eyelids shut, but fish have not yet evolved to this point. You can see the heads of all animals with larger brains than fish. All muscles are protected under the skin. Of course, fish also sleep. But since fish have no eyelids, they cannot close their eyes. It looks like it never sleeps. When most fish sleep, they just remain motionless and peaceful in the water.

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Update Time: 2024-11-18

This template belongs to science courseware Third Grade Science Volume 1, Textbook Edition industry PPT template

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