What are the interesting fish? (Illustration) Fish is the oldest vertebrate. Hybridization of some different chromosome numbers [1]_ jingjing jingjing jingjing jingjing jingjing jingjing jingjing jingjing jingjing is a kind of temperature-changing vertebrate, which lives in water all the year round, breathes through gills, and uses fins to assist body balance and movement. According to the statistics of the late Canadian scholars, there are 246 18 species of fish in the world, accounting for more than half of the named vertebrates. New fish species are constantly being discovered, with an average of about 150 species per year, which should increase by more than 1500 species in more than ten years. At present, there are about 32 100 species of named fish in the world. It is the most primitive and lowest group in the subphylum of vertebrates.

Fish is rich in animal protein and phosphorus, rich in nutrition and delicious. It is easily digested and absorbed by human body and plays an important role in the development of human physical strength and intelligence. Other parts of fish can be made into cod liver oil, fish glue, fish powder and so on. Some fish, such as goldfish and tropical fish, are brightly colored and have high ornamental value. China has a long coastline, many rivers and lakes, and rich fish species. According to the survey, there are more than 1000 species of freshwater fish in China, and the famous "four great families" (herring, grass carp, silver carp and bighead carp), carp and crucian carp are the main excellent freshwater fish species in China. There are about 2,000 known marine fishes in China, including hairtail, large yellow croaker and salmon.

The whole picture of marine fish is as follows:

1. Blackhead fish

Commonly known as pig-billed fish, there are many kinds of water layers living above 1000m, which are mainly distributed in the Yellow Sea, Bohai Sea, East China Sea and South China Sea in China.

2. Laobanyu

The old fish, scientific name Kunlei, has more meat, less thorns and no bones. Its meat can be eaten fresh, but it is more pickled and processed into light dried fish. Ray's muscles contain a small amount of urea, so it needs to be scalded with boiling water before cooking fresh food to remove the odor.

3. Needlefish

Needlefish are distributed in the western part of the North Pacific Ocean. In China, they are only distributed in the Yellow Sea and Bohai Sea, mostly in shallow sea estuaries. Needlefish is rich in nutrition and has high economic value. Needlefish belong to marine miscellaneous fish. Because of its short growth cycle, rapid generation renewal and easy resource replenishment, it often maintains a certain catch.

4. Duobao fish

Scophthalmus maximus is commonly known as PARALICHTHYS olivaceus. If it is cultured artificially, the growth period is obviously shortened, and it can reach about 500~600g in the same year under suitable conditions. Under the conditions of temperature control and light control, mature eggs can be obtained all year round, and artificial insemination is used for artificial reproduction.

5. mackerel

Spanish mackerel is distributed in the western part of the North Pacific Ocean and in the Bohai Sea, the Yellow Sea and the East China Sea. In summer and autumn, they migrate in groups, and some enter the Bohai Sea to lay eggs. In autumn, it often feeds in groups near coastal islands and rocks, and is one of the northern economic fish.

How to draw a picture of a fish The picture of a fish is as follows:

Material preparation: a piece of paper and a black pen.

Operating steps:

1. First, draw two arcs on the paper. The arc is the body of a fish, and the two sides don't need to be closed. Choose the opening position on one side and draw two closed ellipses to form a fish mouth. Note that this mouth is round and flat.

2. Then draw an arc along the longitudinal direction at a quarter of the whole body near the fish mouth, and draw a round fish eye between the arc and the mouth, thus completing the drawing of the fish head. Pay attention to the fish's eyes, don't leave them blank.

3. Draw the fishtail directly at the open end on the other side. The shape of the tail should be enlarged appropriately, and at the same time, the fish tail should be drawn with curves, giving people a sense of suspension of the fish in the water.

4. The dorsal fin and pectoral fin are also painted with curves, which makes the image of fish more like swimming in water. Use curves and straight lines to describe the dynamics of fish.

5. Finally, complete the connecting parts, and check the proportion of each part and whether the fish tail is symmetrical up and down.

The main points of painting:

1, learn from decorative painting. Picture segmentation, point, line and plane composition, visual balance, rhythm of picture element arrangement. Color collocation, color distribution and so on, color psychology. Starting from learning the most basic laws of visual aesthetics, it will be of great help to art study at any stage in the future.

2. Then sketch painting began to learn. Learn from structure sketch, and express the structural relationship and spatial perspective relationship with lines. From simple geometry to complex geometry, to plaster head and still life sketch. Learn how to brush and draw smooth lines. The purpose is to learn to express the spatial structure of objects.

3. Learn the rules of color composition and usage through still life and landscape sketch, which echoes the color collocation and distribution in plane composition. How to use color contrast to shape the volume of light and shadow, the performance of different materials under different light sources, and color psychology.