CATDOLL : CATDOLL: What are some small carnivorous fish? What is protein-energy ratio?

1. Several types of small carnivorous fish?

Small fish include ten species, such as Mark toast fish, water tiger fish, golden killifish, red cross fish, tiger barb fish, thunder dragon fish, South American tooth fish, red-bellied water tiger fish, sand catfish, and jade-faced crown fish.

They are all carnivorous fish, eat fast, move in groups, and are very ferocious. Therefore, they are called the top ten ferocious small fish. They cannot be raised together, so they need to be separated during feeding.

2. What is protein energy ratio?

The protein-energy ratio is a unit that measures the relationship between protein and metabolizable energy in feed, expressed in grams per megajoule, that is, the ratio of grams of crude protein per kilogram of feed to the megajoules of metabolizable energy. It can also be said that the protein-energy ratio is the grams of crude protein contained in feed per megajoule of metabolizable energy. For example, my country's chicken feeding standards stipulate that for chicks aged 0 to 8 weeks, there is 11.91 megajoules of metabolizable energy per kilogram of feed, 19% crude protein (210 grams), and the protein-energy ratio is 15.95 grams per megajoule. The calculation method is 190 grams ÷ 11.91 megajoules = 15.95 grams per megajoule.

The protein-energy ratio of feed varies depending on the chicken breed, growth stage, production status and environmental conditions.

It is very important to maintain a certain protein-energy ratio in the feed, because energy and protein are important nutrients for chickens, and they are indispensable and cannot replace each other. The feeding characteristics of chickens are to adjust the feed intake according to the energy concentration of the feed within a certain range. If the energy concentration of the feed is high, the feed intake of the chickens will be less. On the contrary, if the energy concentration of the feed is low, the feed intake of the chickens will be more. Generally speaking, for every 100 kJ/kg increase in metabolizable energy in the feed, the feed intake of the chickens will decrease by 3.5%. Therefore, when the energy concentration of the feed changes, the protein level should also be adjusted accordingly. If the energy concentration increases, the protein content should be increased accordingly, and vice versa, it should be reduced to maintain a certain proportional relationship. If this is not the case, two adverse consequences will occur in practice: for low-energy and high-protein feeds, chickens eat more, resulting in excessive protein intake to meet energy needs, thereby increasing the burden on the body and easily causing gout. Feeding low-energy and high-protein feeds not only increases feed costs, but also has no good effect. For high-energy, low-protein feed, the chicken's feed intake is relatively reduced. When the energy is met, the protein demand is not yet met. Feeding this feed for a long time will also affect the growth and development and egg production of chickens, reduce their production performance, and will not achieve good economic benefits.

3. Is carp a carnivorous fish?

No, carp is an omnivorous fish.

Carp is a bottom-dwelling omnivorous fish that eats both meat and vegetables. It has a wide range of food sources, a well-developed snout, and often digs mud to feed. Carp is also a low-level cold-blooded animal, whose body temperature changes with the water temperature. It does not need to consume energy to maintain a constant body temperature, so the total amount of food it needs to eat is not large. At the same time, carp, like most freshwater fish, is a stomachless fish, and has a short and thin intestine and a fast metabolism, so its feeding habits are to eat less and eat more frequently. The digestive function of carp is closely related to the water temperature, and its feeding is very seasonal.

4. What taste do carnivorous fish like?

Carnivorous fish like fishy smells. Carnivorous fish are fish in the ocean or freshwater that mainly feed on animals. According to the objects they feed on, they can be divided into two categories: one is mild carnivorous fish, also known as "primary carnivorous fish", which mainly feed on aquatic invertebrates, and can be divided into planktonic fish and benthic fish. The former includes bighead carp, herring, shad, anchovy, basking shark, whale shark, etc., and the latter includes black carp, mullet, sea bream and flounder, etc.

The other type is ferocious carnivorous fish, also known as "secondary carnivorous fish" or "piscivorous fish", which mainly feed on vertebrates (especially fish), such as pike, bighead carp, snakehead, hairtail, and man-eating shark.

5. What carnivorous fish are there in Guangxi?

There are carnivorous fish such as catfish, bone fish, carp, and tilapia in Guangxi.

6. Fish energy ranking?

01 Cod [cod, pollack] 100 (g/ml) Calories 88 kcal.

02 Ray [Mantis] 100 (g/ml) Calories 90 kcal.

03 Herring [fast fish, powerful fish] 100 (g/ml) Calories 159 kcal.

04 Flounder [flounder, popeye fish] 100 (g/ml) Calories 107 kcal.

05 Squid (soaked in water) 100 (g/ml) Calories 75 kcal.

06 Squid (fresh) [Squid, Taiwan squid, squid] 100 (g/ml) Calories 84 kcal.

07 Squid (dried) [Taiwanese squid] 100 (g/ml) Calories 313 kcal.

08 Cuttlefish (dried) [Cuttlefish] 100 (g/ml) Calories 287 kcal.

09 Mullet [white-eye mullet] 100 (g/ml) Calories: 119 kcal.

10 Cuttlefish [Cuttlefish] 100 (g/ml) Calories 83 kcal.

11 Sea bream [black sea bream, copper basin fish, bigeye fish] 100 (g/ml) Calories 106 kcal.

7. All carnivorous fish in the Amazon River?

There are many carnivorous fish in the Amazon River, the top five of which are:

1. Black Caiman: The black caiman is also called the black crocodile, also known as the Amazon alligator. It is one of the largest reptiles in existence and also the largest carnivorous animal in the Amazon River Basin. The largest individual can grow to about 5.5 meters.

2 Amazon Anaconda: Amazon Anaconda, also known as Green Anaconda, is recognized as the largest snake in the world. It can grow up to 10 meters and weigh about 500 kilograms, but most of them are about 5 meters.

3. Piranhas: Piranhas are also called piranhas and water tiger fish. There are 56 species of piranhas, which are generally divided into omnivorous and carnivorous. The scientific name of carnivorous piranhas is red-bellied piranhas. They are very ferocious and social fish, and piranha attacks often occur.

4. Thorny catfish: Many people say that the thorny catfish is the top killer of the Amazon River. Even the ferocious animals mentioned above dare not touch it easily. The reason is that the thorny catfish is covered with long spines, so many animals stay away from it.

5 Electric eel: As its name suggests, the electric eel swims very slowly, with a maximum length of about 2.5 meters and a weight of 30 to 40 kg. Despite its slow movements, it is one of the "most terrifying freshwater animals on earth" selected by the National Geographic magazine website, and is well-deserved as the "top killer" of the Amazon River.

8. What carnivorous fish are there in Shaanxi’s rivers?

The carnivorous fish in Shaanxi rivers include Sichuan-Shaanxi Taihu salmon.

The Sichuan-Shaanxi Taimen is also called tiger fish and cat fish because of its ferocious living habits and temperament. It is a carnivorous fish. The Sichuan-Shaanxi Taimen belongs to the class of fish, the order of salmoniformes, the family of salmon, and the genus of Taimen. It has many aliases and common names, including Sichuan Taimen, Blake Taimen, and tiger fish, tiger fish, and cat fish according to its spotted features.

9. Non-carnivorous freshwater fish?

The common non-carnivorous fish are only silver carp and bighead carp. Other fish such as crucian carp, carp, grass carp, whitebait, etc. are omnivorous fish.

There are also some fish that are completely carnivorous, such as snakehead fish and catfish. Anyone who has fished knows that you can only use vegetarian bait when fishing for silver carp and bighead carp, and you can't catch them with meat bait. But it's different when fishing for crucian carp, whitebait, carp, etc. They eat both meat and vegetables. But snakehead fish and catfish only eat meat bait.

10. What is protein energy ratio? How to calculate it?

The protein-energy ratio is a unit that measures the relationship between protein and metabolizable energy in feed, expressed in grams per megajoule, that is, the ratio of grams of crude protein per kilogram of feed to the megajoules of metabolizable energy. It can also be said that the protein-energy ratio is the grams of crude protein contained in feed per megajoule of metabolizable energy. For example, my country's chicken feeding standards stipulate that for chicks aged 0 to 8 weeks, there is 11.91 megajoules of metabolizable energy per kilogram of feed, 19% crude protein (210 grams), and the protein-energy ratio is 15.95 grams per megajoule. The calculation method is 190 grams ÷ 11.91 megajoules = 15.95 grams per megajoule.

The protein-energy ratio of feed varies depending on the chicken breed, growth stage, production status and environmental conditions.

It is very important to maintain a certain protein-energy ratio in the feed, because energy and protein are important nutrients for chickens, and they are indispensable and cannot replace each other. The feeding characteristics of chickens are to adjust the feed intake according to the energy concentration of the feed within a certain range. If the energy concentration of the feed is high, the feed intake of the chickens will be less. On the contrary, if the energy concentration of the feed is low, the feed intake of the chickens will be more. Generally speaking, for every 100 kJ/kg increase in metabolizable energy in the feed, the feed intake of the chickens will decrease by 3.5%. Therefore, when the energy concentration of the feed changes, the protein level should also be adjusted accordingly. If the energy concentration increases, the protein content should be increased accordingly, and vice versa, it should be reduced to maintain a certain proportional relationship. If this is not the case, two adverse consequences will occur in practice: for low-energy and high-protein feeds, chickens eat more, resulting in excessive protein intake to meet energy needs, thereby increasing the burden on the body and easily causing gout. Feeding low-energy and high-protein feeds not only increases feed costs, but also has no good effect. For high-energy, low-protein feed, the chicken's feed intake is relatively reduced. When the energy is met, the protein demand is not yet met. Feeding this feed for a long time will also affect the growth and development and egg production of chickens, reduce their production performance, and will not achieve good economic benefits.