Lyn, a friend at the senior center, gave me a fish that her husband had caught. A few days ago, when there was time on Saturday, I took the fish out of the refrigerator to thaw, it was like a small rugby ball that was squashed, and at near noon, I saw that a lot of blood had dripped from the bowl, and the fish body had become soft, so I took it and scraped the fish scales, and then used scissors to cut open the fish belly, took out the belly fish gills, opened the faucet to rinse the fish body and the fish belly, and saw a bare little fish sliding on the rubber pad of the pool.
Could it be that the big fish swallows the small fish whole into its mouth, and the small fish breaks out of the intestine? After rummaging for half a day, the stomach of the fish squeezed into a black lump was intact, and there was no gap in the fish intestines and so on. But this small fish looks very much like a big fish, strange, is it difficult to believe that this small fish was originally a small baby in the mother's belly? I'm confused....
It just so happened that mr. I came back from outside and saw that I was fiddling with this small fish, so I excitedly put the small fish in the belly of the big fish and prepared to take a picture. I deliberately put a tooth in the belly of the fish and successfully took a picture of the small fish in the belly of the big fish. I rushed to divide the drained fish into two, made the tail into braised paddle, ate it at noon, and fried the rest of the head, ready to make a spicy tofu fish head pot the next day. When mr. set the dishes, I sent the information and photos of the small fish in the belly of the big fish to the WeChat circle of my medical colleagues. Who knows the kung fu of a meal, actually received nearly ten WeChat messages, each expressing their own opinions, enthusiastic people also attached a link about fish, which greatly enhanced my curiosity. Others say that putting in a toothpick is a bright spot, like a surgical hook, making the field of vision clear at a glance, and at the same time having a control size scale. In the end, they are not far from the line of three sentences. After the meal, I went online with great interest to find information and gained a lot of knowledge.
It turns out that there are several animal breeding methods that can be contacted in our daily lives:
First, the fetus is born, and the body is fertilized, such as: cattle, horses and sheep. The egg is fertilized in the body, and after the fertilized egg is formed, it migrates into the womb. Before the formation of the placenta, the development of the fertilized egg is completely nourished by the egg itself, and then the placenta is circulated by the mother through the blood circulation to provide the nutrition needs for fetal development until the fetus matures and is delivered out of the body.
Second, the egg is born, and the body is fertilized, such as chicken and duck. The egg is fertilized in the body, and after the fertilized egg is fully developed, it is delivered out of the body by the mother. Outside the mother, the fertilized egg hatches, matures, and breaks out of its shell into the world. A large number of hens are raised in cages on chicken farms, and the eggs they lay are all chicken eggs and have not been fertilized, so they cannot hatch chickens. Only in the presence of the rooster is the shen, it is possible to find the eggs of the "fertilized egg" that have been fertilized in the body. Such "fertilized eggs" eggs are selected to hatch the chicks. Oviparous animals are provided with all nutrients from the formation of fertilized eggs to the maturity of their offspring.
OVate, in vitro fertilization, such as most fish. During the mating time, the female throws out a large number of eggs - fish roe, while the male shoots out a larger number of sperm, and the eggs and sperm seize the time to chase the collision in the water outside the mother's body to achieve fertilization. The fertilized egg adheres to relatively stable aquatic grass and gravel, resigns itself to fate in the nature without maternal protection, matures, and comes into the world by breaking the egg membrane. Because it is developed in vitro fertilization, the number of released egg sperm must be huge to improve the fertilization rate, and the eggs should be relatively large and contain nutrients to support the smooth development and maturity of the fertilized eggs that have "seen the world through wind and rain" and are born safely. Therefore, people have a large and large number of sturgeon eggs made of "caviar" food.
Iv. Oviparous birth, in vivo fertilization, maternal intra-abdominal development, such as a small part of the fish. As Lyn gave me, its English name: Crappie, Chinese name: Thorn Cover Sunfish, is abundant in North America. The egg is fertilized in the body, and the fertilized egg is in the mother's womb but not in the womb, and the nutrients provided by the egg develop until the offspring mature, and then the mother squeezes out of the abdominal cavity and comes into the world. The mode of reproduction of oviparous birth is the reproduction mode formed by the long-term adaptation of animals to adverse environments. No wonder I found that the belly cavity of this fish was small during the fish section cleaning, but the abdominal wall was thick and the fish spines were large and few, which made me, a medical worker from obstetrics and gynecology, realize that such a physiological anatomy was very conducive to childbirth function. Therefore, diners who love "braised paddling" choose this kind of "egg-born" fish to cook, and the "braised paddling" made must be thick and tender, with large and few thorns, and it is very enjoyable to eat in large bites.
It was this "fish caught" that made me regain the old business of dissecting the belly of the fish for a long time, see the abdominal anatomy of this fish, enjoy the delicious fish I cooked, and learn the rare breeding method of "egg fetus" in the animal kingdom.