Elementary Science, Observing Crucian Carp 5, Elementary Science, Observing Crucian Carp

When looking at the heart, be careful not to mistake the arterial bulb for the ventricles. The atria of crucian carp are dark and thin-walled, the ventricles are reddish and thick-walled, while the arterial bulb is white.

The position and shape of the swim bladder are evident in the internal organs of the crucian carp, and to observe the swim bladder, you can press down with your fingers on other organs under the swim bladder, and you can see a slender swim bladder emanating from the front of the ventral surface of the posterior chambers. If you want to confirm whether it is a swim bladder, you can use a dissecting needle to gently pick it up, and if the digestive tract can be stretched, it means that it is a swim bladder.

In its natural position, the reproductive system often covers the digestive system, so it's best to look at the reproductive system first. Ask students to distinguish between male and female fish based on the structure of their reproductive systems, and exchange observations between groups. Finally, remove the swim bladder and reproductive system, you can see the esophagus and twisted intestines of the crucian carp, be careful not to rush to straighten the intestines, so as not to damage the liver and pancreas.

To observe the respiratory system, have the students insert a dissecting needle through the mouth of the crucian carp and through the gill hole at the posterior edge of the operculum. Then use a dissecting needle to test whether the nostrils of the crucian carp are connected with the mouth, so that students can understand the flow of water through the gills, and then instruct students to use tweezers to open the gills, observe the gill slits between the gills, and then cut a section of gill and dip it in clean water to observe the bright red gill filaments.

1. Streamlined. 2. The mouth of the fish is open, and the gill cover is closed.

3 scales. 4 rubble-like covering.

Summary. Hello dear, according to the situation you described, the observation of crucian carp experiment is a classic behavioral experiment, and its findings are of great help in understanding animal behavior patterns and ecology. In this experiment, the researchers placed crucian carp in a circular pool of water and added food to its center.

Over time, they found that crucian carp would congregate around their food, and as the bait gradually decreased, the crucian carp would gather more and more. The results of this experiment show that crucian carp are somewhat social, and they tend to congregate together, especially when resources are scarce. This behavior is called"Clustering effect", which is very common in nature, as many animals will tend to congregate together to get more resources or to protect themselves from predators.

In addition to this, the observation of crucian carp experiments also revealed the interaction between animal behavior and the environment. For example, in experiments, factors such as the size of the pool, the type and amount of food can all affect the aggregation behavior of crucian carp. These results suggest that to fully understand animal behavior, we need to consider the environmental and ecological conditions in which they live.

Hello dear, according to the situation you described, the observation of crucian carp experiment is a classic behavioral experiment, and its findings are of great help in understanding animal behavior patterns and ecology. In this experiment, the Crucian carp was placed in a circular pool of water and food was added to its center. Over time, they found that crucian carp would congregate around their food, and as the bait gradually decreased, the crucian carp would gather more and more.

The results of this experiment show that crucian carp are somewhat social, and they tend to congregate together, especially when resources are scarce. This behavior is called"Clustering effect", which is very common in nature, as many animals will tend to congregate together to get more resources or to protect themselves from predators. In addition to this, the observation of crucian carp experiments also revealed the interaction between animal behavior and the environment.

For example, in the experiment, factors such as the size of the pond and the type and quantity of food all affected the aggregation behavior of crucian carp. These results suggest that to fully understand animal behavior, we need to consider the environmental and ecological conditions in which they live.

Observation of the conclusion of the experiment with crucian carp.

Crucian carp is a common freshwater fish, and many scientists have conducted various studies on them. Some of these studies use experimental methods to look at the ecological, behavioral, and physiological characteristics of crucian carp. The conclusions of these experiments vary depending on the purpose and method of the experiment.

As an example, an early experiment showed how crucian carp responded to changes in oxygen concentration in water. The conclusion of this experiment shows that when the concentration of oxygen in the water drops to a certain level, crucian carp will experience a series of reactions, including faster breathing, more frequent swimming, and faster heart rate, which can help crucian carp adapt to the low-oxygen environment. The results of this experiment are of great significance for understanding the ecological environment of crucian carp and the adaptation mechanism of stool annihilation.

In short, the experimental research on crucian carp is very extensive, involving many fields such as ecology, physiology and behavior, and the conclusions of different experiments are not the same.

a. Crucian carp breathe with gills in the water, not lungs, a false B. The body of the fish is spindle-shaped (streamlined), with a large middle and two small ends, which can reduce the resistance when swimming, B is correct; c, the body of the fish has pectoral fins, dorsal fins, pelvic fins and caudal fins are the organs of the alpine fish in the water, the power of the crucian carp swimming mainly comes from the swing of the tail fin and the trunk, c false d, there is a row of lateral lines on both sides of the fish's body, and the lateral line is connected with the nerves, mainly to determine the direction and perceive the role of the water flow, d wrong so choose: b