Food of field crabs must be fresh, not stale, moldy. Need to feed the field crabs enough, if the crabs lack food, it is easy to eat each other. Ms. Nguyen Thi Huong, Yen Tho commune, Dong Trieu district, Quang Ninh province harvests field crabs from her family’s farm. In ponds and fields, it is necessary to arrange a number of eating floors to assess the crab’s catching status, and at the same time to adjust the amount of food according to weather conditions. In the last months of the crab farming cycle, it is necessary to add more animal food in the diet to make the crabs grow fast and firm. It is possible to add more field tilapia and tilapia to eat crab leftovers, reducing water pollution. Field crab is the type that adapts to cool weather, so it is necessary to alternately plant water spinach, rice, and cash crops to keep the crabs’ shade in the summer. The water environment also needs to be kept clean and regularly change the source of water in and out to stimulate crabs to molt and catch strong prey. “Investment capital for crab farming is very low, mainly hiring workers to dig ponds, buy corrugated iron and bamboo poles to enclose the embankment. Currently, every day, my family earns about 3-4kg, selling 150,000 VND/kg ‘, Ms. Huong revealed. Through research, seeing that field crabs are popular with many people, taking advantage of low-lying rice fields for low productivity, Ms. Nguyen Thi Huong studied and brought back field crabs to release on her field. Because field crabs have no place to produce seed, they have to buy from people who go wild. Ms. Huong said: “At first, I bought crab seed from traders from Hai Duong to release, but each release the number of dead crabs was up to 70%. After a few dead crabs, I learned from experience that if I want to have a high survival rate and grow up quickly, I have to buy native breeds…” “In addition to raising commercial crabs, I also zoned the field and selected some adult crabs to breed separately. Here I will invest in buying brick holes to build banks, planting many layers of concrete pillars, with The purpose is to let the crabs live in, creating a favorable environment for the crabs to grow and develop better”, Ms. Huong added. Talking to us, Ms. Nguyen Thi Huong, Chairwoman of the Farmers’ Association of Yen Tho Commune (Dong Trieu Town, Quang Ninh Province) said: “Ms. Nguyen Thi Huong’s model of field crab farming has brought high economic efficiency. . From the initial results, in the coming time, the Commune Farmers’ Union will direct the grassroots branches, exchange experiences, and mobilize people in the commune to replicate this model. Especially, taking advantage of low-lying areas and inefficient rice-growing areas to develop commercial crab farming models, contributing to increasing income and improving the lives of members and people.

Mr. Nguyen Ngoc Chien (fish owner) is feeding fish. The fish is nearly 30 years old but only vegetarian with white rice and green vegetables. Mr. Chien said the fish has been raised since his grandfather’s time, after his death he has taken over the fish farming for 18 years now. Fish only eat white rice sometimes with vegetables Initially, he also dropped the food into the pond, but strangely, the fish did not eat it, so he had to find another way. For nearly 20 years, he feeds fish twice a day, morning and afternoon. Fish only eat white rice from time to time with green vegetables. The special thing lies in the feeding habits of the fish. Before the meal, Chien tapped the bowl to order fish. Then he put a spoonful of white rice with his hands, gently, so that the fish raised its mouth out of the water to grab it. Farmers have to feed each spoonful of rice to the fish Chien said that the school of fish has been around for a long time, with about 100 fish, there are 70 statues. The heaviest one is about 5kg. The fish is very brave, as close to him as a pet in the house. There are about 100 fish in the school It is known that in Vietnam, some types of giant fish are popular such as: African giant fish (leopard skin), white giant fish, red giant fish, and yellow giant fish. Giant fish belongs to the group of omnivorous fish with a preference for plants. Fish that eat from small and medium-sized zooplankton to worms, worms, insects, duckweed… The more fish are raised, the more they switch to eating plants, accounting for 87.5%. When mature, the giant giant fish can eat most vegetables, aquatic plants and other by-products.

The extinct prehistoric mammoth was believed to be prehistoric human prey. A controversial new study found that the first humans were large predators who took down prey with skilled hunting skills. In a new research paper, the scientists argue that humans and close relatives have been adept hunters from a very early age, starting at least 2 million years ago. Miki Ben-Dor and Ran Barkai, researchers at Tel Aviv University in Israel, and Raphael Sirtoli, a PhD student at Minho University in Portugal. “Until now, efforts to recreate the Stone Age human diet have been based mainly on comparison with 20th century hunter-gatherer societies,” says Ben-Dor. Of course, this comparison is lame, because 2 million years ago, hunter-gatherer societies could hunt and consume elephants and other large animals, while hunter-gatherers today. It can’t be like that. The whole ecosystem has changed, and the conditions cannot be compared. ” Scary evidence Fossil evidence from earliest human ancestors is scarce. But based on archaeological evidence, Ben-Dor said, it was clear that Homo sapiens and their close relatives ate anything that was edible. But how much of their diet consists of plants versus animals is the bottom line. Many animals that are considered omnivores actually have the diet in one way or another. Chimpanzees, for example, are technically omnivores, but meat makes up only about 6% of their diet. Dogs and wolves are predominantly carnivorous but sometimes also nibble on grain, leading to a debate over whether they should be classified as omnivores or predators. According to Ben-Dor, ancient humans Homo habilis ate meat at least 2.6 million years ago. Another primitive human species, Homo erectus, appeared to be an avid carnivore 1.8 million years ago; Their teeth and intestines shrank compared to their previous ancestors, adapted to digest meat instead of plants, and it used stone tools capable of grinding meat. Ben-Dor and Barkai argue in their paper, published in the American Journal of Physical Anthropology, that meat is not just a reward for these humans and the early Homo sapiens. Instead, the authors believe, large animals weighing more than 1,000 kg, such as elephants, hippos and rhinos … make up the bulk of the human diet. The elephants 500,000 years ago could weigh 12 tons, compared with 4 to 6 tons today. Eat a lot of meat, human brain evolution? According to the researchers, these animals can eat fatty meat, which is very suitable to feed the energy-hungry human brain. The authors argued in another recent article that hunting large prey could be the driving force behind human brain evolution. However, the idea is controversial, and researchers disagree on how huge amounts of meat would be useful to hunter-gatherers in the days before refrigeration, as well as about ancient humans skilled in taking down prey that other predators like lions, struggled to defeat. “There are some archaeologists who say, they hunted elephants once, but it’s like a once in a lifetime hunt; that’s what grandparents often tell their children,” John said. “There are people who say that elephant meat can last a long time without preserving, but it’s part of their routine,” said Hawks, a paleontologist at the University of Wisconsin-Madison. important to them. ‘” Ben-Dor and his colleagues wrote in their article that eating large, fatty animals would be a benefit to humankind at the earliest, because losing so many calories on a hunting trip – instead of repeatedly trying to stalk smaller prey. Humans exhibit this high-fat adaptation, researchers say. Archeologically speaking, it was difficult to classify humans and their relatives as carnivores before about 50,000 years ago. That’s because the only reliable biochemical way to distinguish an animal as the top predator or lower in the food chain is a method known as stable nitrogen isotope analysis, requires collagen testing for molecules that are taken orally into the body. Despite the limited evidence of humankind’s early evolution, the researchers say, much remains to be done to prove whether the human ancestor was indeed carnivores. This could include more research on the abundance of animals of different sizes during the Pleistocene, exploring genetic changes over time that could alter the digestibility of species. Different human feeds and comparison of prey size trends over time.

Aquarium or aquatic shrimp is a common term for many types of shrimp. With a size slightly larger than the tip of a toothpick, the shrimp have many different names such as red cherry, bee, tiger, Kinh kong, red nose, white dot, green, yellow pumpkin … depending on the type.

This ornamental creature has a colorful appearance, eats vegetables in a glass tank, cleans the environment, so it easily “attracts” many players. Most of the common types of shrimp in Vietnam are originated from Japan, Taiwan, Indonesia …

Although ornamental shrimp is popular, it is quite “picky” for farmers because the life expectancy of this species is very low, susceptible to disease and highly contagious. At the same time, breeding shrimps requires farmers to have high technical skills.

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Mr. Le Tuan Anh (Ha Huy Tap ward, Ha Tinh city) revealed: Shrimps are sensitive to weather, food, water and light so players need to be very clear about their pathology, closely monitor abnormalities to avoid them falling ill.

The most important factor for the beautiful color and healthy life of the shrimp is the water quality.

If you see shrimps swimming weak, lethargic need to change the water immediately. If there is discoloration or fading in the aquarium shrimp, the water quality is deteriorating. (In the photo are kinds of shrimp that are quite easy to live like: RC red shrimp, Chocolate shrimp, Blue Dream …)

In the summer, players of ornamental shrimp in Ha Tinh also struggle to maintain the ideal temperature because most of the ornamental shrimp lines prefer cool temperatures. At temperatures higher than 28 degrees Celsius, shrimp will not be able to lay eggs, even fading.

In order to maintain the ideal living environment for shrimp, players also have to invest in some additional tools such as filtration system, projector lamp, background distribution, cooling fan, PH meter, thermometer …

Shrimps are omnivores that do not require special food. In addition to algae, harmful algae, and plant foods, players can also add some specialized foods.

The cost of shrimp depends on the type, pattern, color of the shell and its rarity. The most popular and affordable one is the Red cherry (cherry shrimp) about 20 to 50,000 VND / pair. More expensive, there are types of yellow shrimp, black shrimp, Kingkong, Panda, Red Ruby … from 100,000 VND to several million / animal. In particular, there are types of hybrids, mutant shrimp that are offered for tens of millions of dong.

Although the hobby of playing shrimp is a bit fussy, with many people taking care and cherishing each small shrimp becomes a hobby. Mr. Nguyen Cao Cuong (Bac Ha ward, Ha Tinh city) shared: “After a long and hard day, the time I spent watching the shrimps brought me a feeling of comfort. Taking care of shrimp also trains me to be patient, because it is difficult to be impatient and impatient to control the care of the tank and keep the shrimp ”.