English: Sharks
Classification:
Chordata phylum, Vertebrate subfamily, Chondrichthyes
According to the Lars classification system of 197 1 year, it is divided into the following categories.
Six gill sharks, mouse sharks, tiger sharks, real sharks, horned sharks, saw sharks, flat sharks, wrinkled sharks, 6 orders.
Some people think that sharks are the fiercest animals in the ocean. However, what you see now is a mild whale shark, which feeds on small marine life, similar to baleen whales. Because foods have some similarities, they look very similar to baleen whales after a long biological evolution. This is the so-called "convergent evolution". So the name "whale shark" is natural. Of course, whale shark is the largest shark in existence and the largest known fish.
Question 2: What are the characteristics of sharks? The eyesight is good, the sniffing valve is super good, and you can smell blood from several nautical miles away.
The teeth are changed regularly, and the bite force is amazing.
Without the swim bladder, you have to swim to float.
The perfect killer in the water has not changed in appearance for tens of thousands of years.
Question 3: What fish looks like a shark, but it is very small? Tropical fish blue shark, also known as axe shark and tiger shark, belongs to Siluriformes. Native to Thailand and Malaysia, the fish is about 8~ 15 CM long and the wild fish is 50CM long. It is gentle, eats a lot and grows very fast. This kind of fish often pollutes the water body and affects the ornamental effect.
Freshwater sharks have strong tolerance to hypoxia and a wide range of adaptation, but weak tolerance to low temperature. The optimum temperature is 20℃-34℃, and the optimum growth water temperature is 26℃-32℃. When the water temperature is lower than 18℃, the activity is slow and the response is slow. Death began when the water temperature was lower than 65438 02℃. This kind of fish has all kinds of food. Young fish feed on zooplankton, while adult fish feed on aquatic plants and artificial compound feed. The feed demand for protein is 28%-32%.
Freshwater sharks are omnivores, which eat a lot and grow fast. In that year, fry (3-4 cm) were cultured for 4 months, and their weight could reach more than 0.6 kg, and their sexual maturity was late. After feeding for 3-4 years, they could reproduce when their weight was more than 3 kg. The breeding season is from April to September, and it is a one-time spawning fish.
Question 4: What is the name of a freshwater fish that looks like a shark? Is it a silver dragon?
Question 5: What's the name of this fish? It's as small as a shark. This is a shark, but it should be a newborn shark.
Question 6: What does the abstract shark pattern symbolize? Sharks are adaptable and strong. We added some other symbols: dorsal fin is A, AGNIESZKA, which originally designed the wrist and eyes, is made of coru (life, new beginning), and the edge of the fin contains a stylized Tiki (protective) coat.
The largest waves are coiled in a spiral (eternity), and the smaller waves are surrounded by sunlight at the bottom (energy, joy and success. )
Question 7: I saw a shark-like fish in the fish tank. What kind of fish is this? There are not many kinds of sharks, including blue sharks, silver sharks and tiger sharks. The so-called "shark" in the freshwater aquarium has nothing to do with the real shark, but its appearance is similar. Silver shark belongs to CYPRINIDAE, and sweat shark belongs to Silurus.
Question 8: What is the shark-like fish in tropical fish? Catfish, mainly. There are many blue sharks and tiger sharks in the market. Blue shark is about 4 yuan 10cm, and tiger shark is a little more expensive, about 30 yuan. I used to have two blue sharks. If you are naked, you can keep them. Forget the straw tank. I don't think it looks good after watching it too much. In fact, it is not a shark, but a catfish with a beard. It looks terrible.