What are the characteristics of the external form of crucian carp that adapt to life in the water?

Take carp, for example:

1. The back is dark gray-black, and the abdomen is white. This is a protective color.

Second, the body is fusiform (head and tail pointed, and the trunk is broad).

3. There is mucus on the surface of the fish.

Fourth, there are lateral lines (sensory organs) on both sides of the body

5. There are fins (locomotor organs.

The general body length is 15 to 20 cm. The sides of the body are flat and tall, the body is thick, and the abdomen is rounded. The head is short and the snout is blunt.

Without. The gill rakers are long, and the gill filaments are slender. Hypopharyngeal teeth in a row, flat sheet shaped.

Large scales. The lateral line is slightly curved. The dorsal fin is long and the outer edge is straight.

The third hard spines of the dorsal and anal fins are strong, and the posterior margin is serrate. The end of the pectoral fin can reach the beginning of the pelvic fin. The caudal fin is deeply forked.

Generally, the dorsal surface of the body is grayish-black, the ventral surface is silvery-gray, and the fins are grayish-white. Depending on the water in which it grows, the body color is different.

The abdomen is white on the back and the back is black. Natural predators look down from above the water, and because the black back of the fish is the same color as the silt at the bottom of the river, it is difficult to spot; If the predator looks up from the bottom of the water, it is difficult to find the white fish belly because the color of the white fish is similar to that of the sky; I often see some articles describing that in the early morning, "the east is white", which is the reason. It is a protective color.

That's a lot. For example, its streamlined body, fins control balance, tail control direction, etc.

The experimental plan is simple, find some crucian carp, cut off the fins and tails respectively, and observe its activities.

The general body length is 15 to 20 cm. The sides of the body are flat and tall, the body is thick, and the abdomen is rounded. The head is short and the snout is blunt. Without. These shapes or external structures of crucian carp indicate that the fish has adapted to life in the water.

Answer: Analysis:

1. Body color: dark gray-black on the back, white on the ventral surface, not easy to be found by enemies; 2. Body shape: fusiform, reducing water resistance when swimming; 3 Body Surface:

There are scales to protect the body, there is mucus to reduce the resistance of water; A: 4 Swim in the water with fins; 5. There is a lateral line, which can sense the water flow and determine the direction; 6 Respiration with gills, which are suitable for absorbing oxygen dissolved in water and excreting carbon dioxide into water; 7. There is a swim bladder in the body, which can regulate the specific gravity of the body; 8 The structure of the heart and blood vessels constitutes a circulatory system suitable for living in the water.

Answer: Analysis:

This question mainly tests the comprehensive ability of knowledge. The morphology, structure, and physiological characteristics of fish can generally be understood, but it is often not comprehensive to consider these characteristics comprehensively. In addition, through the examination of this question, students can also understand that the morphological structure and physiological characteristics of organisms are suitable for their living environment.

In terms of body shape, crucian carp has a fusciform-shaped body, which can reduce the resistance of the water when swimming. The body is covered with scales, which have a layer of sticky and slippery fluid on the surface of the scales, which also reduces resistance. There is a row of lateral lines on each side of the body that is connected to the nerves to determine direction and sense the flow of water.

Swim with fins, in which the swing of the tail fin can control the direction of the body, and the coordination and coordination of various fins can keep the fish body balanced, and stand sideways in the water without tilting and flipping. From the structural and physiological point of view, the fish breathes with gills, the gills are composed of gill filaments, gill rakers and gill arches, the gill filaments are densely covered with capillaries, when the water flows through the gill parts, the oxygen in the water enters the capillaries of the gill filaments, and the carbon dioxide in the blood seeps out of the capillaries and is discharged into the water, completing the respiration. The crucian carp has a white swim bladder on the dorsal side of its body cavity, which is filled with gas, which adjusts the specific gravity of the body and allows the fish to stay in different water layers.

Crucian carp is an in vitro fertilized and oviparous animal, and male and female crucian carp swim into the water to spawn and ejaculation, and the number is very large, so as to ensure the development and maturity of young crucian carp. The above morphological structure and physiological characteristics are suitable for aquatic life.

1. Strong vitality is only covered.

Crucian carp has a very good tolerance, has a strong vitality, and is not easy to die. Even if the water environment is very harsh, as long as there are ants in the water section and there is no poisonous pollution, they can survive and reproduce.

2. I like group fingers to burn the scene.

I like clusters, and most of them are gathered together with individuals of similar size, and the shape of the yuan is very different.

3. Inhabits the lower layer of water.

Crucian carp are demersal fish that often inhabit overgrown waters and swim to humus bottoms to feed.

<> body color: The body color of crucian carp is dark at the top and light at the bottom, which can be used as a protective color.

Body shape: Crucian carp is fusiform, which helps to reduce the resistance of the water.

Lateral line: There is a line of lateral lines connected to nerves on both sides of the crucian carp, which can determine the direction and sense the flow of water.

Fins: Crucian carp has pectoral fins, dorsal fins, pelvic fins, caudal fins, and other organs that allow them to maintain balance and swim.

Breathing method: Crucian carp uses its gills to breathe.

1. What are the morphological and structural characteristics of crucian carp adapted to life in water?

1. The body color of crucian carp is dark at the top and shallow at the bottom, which can be used as a protective color for crucian carp.

2. The crucian carp body is fusiformal, with small ends and large middle, which is conducive to reducing the resistance of water.

3. There is a row of lateral lines on both sides of the crucian carp's body, and the lateral lines are connected to the nerves, which can play a role in determining the direction and sensing the water flow.

4. Crucian carp has pectoral fin, dorsal fin, pelvic fin and caudal fin, of which the dorsal fin can keep the fish body standing on its side and balance the fish body, the pelvic fin can keep the fish body balanced, the tail fin can determine the direction of movement and generate forward power, the anal fin can coordinate other fins to keep the balance of the rubber traveler, and the pectoral fin can maintain balance and change direction.

5. Crucian carp uses its gills to breathe.

6. Crucian carp has a swim bladder in its body, which can adjust the specific gravity of the body and let the crucian carp stay in the water layer at different depths.

7. The body surface of the crucian carp is covered with a layer of scales, and there is a layer of mucus on the scales, which can reduce the resistance when swimming.

Second, how big can the crucian carp grow in a year?

1. The growth rate of crucian carp.

The growth rate of crucian carp is related to the environment and the species of crucian carp. If it is a crucian carp in the wild, it can grow by about 50g a year. If it is a crucian carp cultured in an ordinary fish pond, it can grow by about 150-200g a year.

If the crucian carp is in a reservoir with good water quality and plenty of food, it can grow by more than 250 g a year. If it is a Xiangyun crucian carp (engineering crucian carp Liang suspicion), it can grow about a year.

2. Crucian carp habits.

1) In spring, crucian carp forage day and night. In summer, crucian carp feed in the morning, evening, and night. In autumn, crucian carp feed throughout the day. In winter, crucian carp feed around noon.

2) The water temperature range of crucian carp is 0-32, of which about 15-20 is appropriate. If the water temperature is below 10 or above 20, activity decreases and appetite decreases.

Characteristics of fish suitable for living in water: The body of the fish is fusiformal, and the body surface has a sticky and slippery feeling, which can reduce the resistance of the water; There are scales on the body surface that have a protective effect; The respiratory organ is the gills, which absorb dissolved oxygen in the water Swimming with fins There is a lateral line in the body of the fish that can sense the flow of water, and the direction is determined to be the sensory organ of the fish.

The body shape is fusiformal, which reduces the resistance when swimming, and is suitable for living in water, correct The characteristics of fish are that they live in water, and most of the body surface of the fish is covered with scales, which reduces the resistance of the water, Correct

The respiratory organs of the fish are the gills, which absorb dissolved oxygen in the water, correct The locomotor organs of the fish are the fins, in which the pectoral and pelvic fins have the effect of maintaining the balance of the body, and the tail fin can maintain the direction in which the body of the fish is advancing, correct

1.The body shape of the fish is fusiform, which reduces the resistance of the water. And the body color is deep back and light abdomen, which has a protective effect

2.The body surface of the fish has scales and mucus, which have the effect of protecting and reducing resistance; It also has a lateral line that can determine the direction and sense the flow of water.

3.During the exercise, the fins of the fish are locomotor organs, among which the tail fin can stabilize the body, push forward, and control the direction; There are swim bladders in the body, which help the fish swim between different water layers.

4.The gills are the respiratory organs of the fish, and the numerous gill filaments in the gills help the fish take in oxygen from the water.

Hehe, the fish lives in the water, and its body shape is suitable for the water environment: (1) spindle-shaped, the head and tail axis is the longest, the dorsal and ventral axis is shorter, and the left and right axes are the shortest. The whole body of the fish has a pointed head and tail and a large middle segment, which is shaped like a shuttle.

2) Lateral flattening, the cephaocaudal axis is short, the left and right axes are shorter, the dorsoventral axis is relatively long, and the body is rhomboid with left and right lateral flattening. (3) Flattened, the left and right axes are long, the head and tail axes are average, the dorsal and ventral axes are the shortest, and the dorsal and ventral axes of the fish body are flat, and the left and right sides are broad. (4) The eel is shaped, the head and tail axis is particularly long, the dorsoventral axis and the left and right axes are equal and short, the head and tail of the fish body are thin and pointed, and the trunk part is like a slender round rod, like a snake.

5) Pufferfish-shaped, almost spherical in shape except for a slightly protruding tail.

Crucian carp should belong to one of them, hehe.

1. The body shape is fusiform, suitable for swimming.

2. White and black under the body color, protective color.

3. There are scales on the surface of the body, and there is mucus on the scales, which plays the role of protection and swimming 4. There are lateral lines on both sides of the body, which can sense the flow of water and determine the direction.

Fish have characteristics that are suitable for living in water:

1.The color of the fish's body is dark at the top and light at the bottom, which is the protective color of the fish.

2.The body is streamlined, large in the middle and small at the end.

3.The surface of the body is covered with scales, which protect the body; There is a layer of mucus on the surface of the scales, which reduces the resistance of the water when swimming.

4.There is a row of lateral lines on both sides of the body, which are connected to the nerves, mainly to determine the direction and sense the flow of water.

5.The body of a fish has pectoral fins, dorsal fins, pelvic fins, and caudal fins, which are the locomotor organs of the fish in the water.

6.Fish breathe with gills.

7.The swim bladder in the body regulates the specific gravity of the body mimic, and the swim bladder can make the fish stay in different water layers under the coordination of the fins.

The body is spindle-shaped, with scales and mucus on the body surface, lateral lines on the side of the body, various fins, breathing with gills, and a swim bladder in the body.