CATDOLL : CATDOLL: The body length ratio of fish? The ratio of male sterile rice plants?

1. What is the body length ratio of fish?

The body length of winter-age fish is about 340 mm and the weight is about 750 grams; the body length of 2-winter-age fish is about 600 mm and the weight is 3.5 kg; the body length of 3-winter-age fish is about 680 mm and the weight is about 5 kg; the body length of 4-winter-age fish is about 740 mm and the weight is about 7 kg; the body of 5-winter-age fish can reach about 780 mm and weigh about 7.5 kg; the largest individual can reach about 40 kg.

Grass carp grows fast and is large, with the largest individual reaching 40 catties. The meat is tender and delicious. Every 100 grams of edible part contains 15.5-26.6 grams of protein, 1.4-8.9 grams of fat, 83-187 kcal of calories, 18-160 mg of calcium, 30-312 mg of phosphorus, 0.7-9.3 mg of iron, 0.03 mg of thiamine, 0.17 mg of riboflavin, and 2.2 mg of niacin.

2. What is the proportion of male sterile rice plants?

Professor Yuan Longping spent two months finding six male sterile rice plants out of 140,000 plants, so the proportion of male sterile rice plants is very low.

3. Why do male sterile plants have high yields?

Because the male sterile rice line is a special type of rice, the male organs in its own floral organs are not fully developed and cannot form normal pollen, while its female organs develop normally. Therefore, it cannot reproduce on its own and needs the help of external rice pollen to produce seeds.

It is mainly a chromosome problem, that is, a hereditary problem. With the application and promotion of hybrid rice, the yield per unit area has been increased and the amount of seeds used has been reduced.

4. Which type of fish contains high levels of succinic acid?

Answer: Green-skinned red-fleshed fish cause allergic food poisoning mainly because they contain a high amount of histidine. When the fish is not fresh or corrupt, bacteria such as histamine-containing bacteria that contaminate the fish produce decarboxylase, which decarboxylates histidine to produce histamine. The mechanism of poisoning is that histamine causes capillary dilation and bronchial constriction, leading to a series of clinical symptoms.

5. Why are there more male silkworm moths?

Male silkworms are basically the same as female silkworms; however, male silkworms need less substances for the development of their reproductive glands, so relatively speaking, male silkworms use more substances to spin silk and make cocoons. Due to the different use of substances in the body, female silkworms spin less silk than male silkworms.

Male silkworms have a shorter growth period, consume fewer silk leaves, and produce more silk per cocoon weight than female silkworms, so people like to raise male silkworms.

6. Which fish are high in DHA?

Generally speaking, marine fish contain more DHA than freshwater fish, and deep-sea fish usually contain more DHA than coastal and offshore fish. Based on existing research and analysis results, nutritionists have come up with a reference table for the order in which to choose fish rich in DHA:

(1) Freshwater fish: Herring, crucian carp, black carp, mandarin fish, blue-eye trout, bream, black carp, silver carp, etc. This is arranged in order according to the relative content of DHA in the unsaturated fatty acids in fish.

(2) Marine fish. The fish are ranked according to the percentage of DHA content in the meat: tuna, mackerel, saury, sardines, conger eel, rainbow trout, salmon, horse mackerel, herring, hairtail, swordfish, and bonito. For tuna, mackerel, saury, and sardines, the DHA content in 100 grams of fish meat is more than 1 gram, which can be called a veritable "DHA fish". Tuna contains up to 2.877 grams of DHA, and the total amount of fatty acids is 20.12 grams, which is truly the "king of fish".

7. Why is the proportion of live broadcasts in the same city so high?

The ratio of the same level is high because there are many people you know in the same city, so there will be more people who support you. This way you can make money quickly.

8. How to regulate high testosterone levels?

If the male hormone is too high, it is easy to cause hirsutism, acne, obesity, irregular menstruation and infertility, which is harmful to the body and needs to be treated with medication. When the male hormone is too high, you can take short-acting contraceptives such as Diane 35 for treatment. When taking medication, you must take the medicine on time every day and do not miss it. You can have a follow-up after two courses of treatment.

9. Why do fish get stranded?

1. System failure: Scientists have not been able to explain why these whales are "stranded" so far, but most explanations are related to the echolocation system in their bodies. In fact, whales do not rely on their eyes to navigate, measure objects and hunt, but have a highly sensitive echo ranging ability. Internal discomfort, parasites or the system itself may cause the echolocation system to malfunction, causing the whales to lose their way and run around.

2. Terrain reasons: Some scientists believe that whales strand themselves because they follow the current to hunt and enter flat waters. When the tide recedes, they become stranded. When they swim into the bay to chase fish, they send ultrasonic waves to the beach with a large slope. The echo is often very inaccurate, or even completely unreceived, and they lose their way. Whales are gregarious animals. If one whale runs into the beach and becomes stranded, the others will follow without hesitation, causing group deaths and injuries.

3. Environmental pollution: Environmental pollution is also considered by environmentalists and scientists to be the cause of whale stranding. Scientists believe that chemicals that pollute the seawater may disrupt the whale's senses. In addition, Dr. Collet, deputy director of the La Rochelle Marine Mammal Research Center in France, believes that the sound waves emitted by warship sonars and echo sounders and the noise of underwater explosions can disrupt the whale's echolocation system.

10. Why do fish like light at night? Why do fish like light at night?

Because fish chase light, stronger light has a certain attraction effect on fish.

Favorite food: Crucian carp is an omnivorous fish. Wild crucian carp feeds on some algae, shrimps, earthworms, young snails, small insects, grass seeds, grains, etc.

Crucian carp can adapt to a wide range of water temperatures, and can eat at water temperatures of 0-30℃. Crucian carp prefers water temperatures of 15-25℃, and is most active and has the strongest appetite at 20℃.