CATDOLL : CATDOLL: Can turtles and duck-billed fish be raised together?

1. Can turtles and duck-billed fish be raised together?

Soft-shell turtles mainly live in lakes, ponds, reservoirs, bays and slow-flowing rivers.

Soft-shelled turtles are cold-blooded animals that live both on land and in water. They breathe with lungs, so there should be enough land beaches around or in the center of the turtle pond for them to carry out land activities. The living habits of soft-shelled turtles can be summarized as "three likes and three fears", that is, they like quietness and fear being startled, they like the sun and fear the wind, and they like cleanliness and fear dirt. Soft-shelled turtles react sensitively to the sounds of the surrounding environment. As long as there is a slight movement around them, they can quickly dive into the mud at the bottom of the water, so the environment of the turtle farm or turtle pond must be kept quiet. If soft-shelled turtles are often frightened, it will be very detrimental to their growth and reproduction.

The soft-shell turtle is an aquatic omnivore that likes to eat animal bait. Juvenile soft-shell turtles feed on aquatic insects, water worms, tadpoles, shrimps, etc. Adult soft-shell turtles eat snails, clams and other mollusks, fish, shrimps, and animal carcasses (because they cannot catch fish), as well as vegetable feeds such as vegetables, fruits, and grains.

The spoonbill fish (Acipenser spathula) is a cartilaginous fish with a naked, moist and scaleless body. Its snout is spoon-shaped and resembles a duck's bill, so it is also called the duckbill fish. Its snout is particularly long and flat, like a pulp; its body is smooth and scaleless, its back is black and blue-gray, and there are often some spots in it; there are dotted ochre on the sides of the body, and the abdomen is white; its mouth is large and its eyes are small, and its forehead is higher than its mouth; its gill rakers are dense and slender, its gill cover bones are large and extend backward to the pelvic fins, its caudal fin is forked, and its caudal peduncle is covered with stalk-like armor scales. The spoonbill fish is large and has a lifespan of more than 30 years. The gonads of the spoonbill mature later, and it generally matures sexually at the age of 8 or above. The diet of the spoonbill fish is similar to that of the bighead carp in my country. It feeds on zooplankton and is a filter-feeding fish.

The duckbill fish is highly adaptable, grows quickly, has a gentle temperament, and has a short food chain. It is the only fish among all sturgeons that feeds on zooplankton. It has a wide source of bait and is easy to raise and catch, making it suitable for breeding in waters such as reservoirs, lakes, and ponds.

Feeding method:

1. The temperature range of the duckbill fish is wide. It is not afraid of low temperatures, but can also tolerate high temperatures. In winter, even if the water surface is frozen, as long as there is sufficient dissolved oxygen in the water, it can live in the water under the ice; in summer, the surface water temperature of the pond often exceeds 35°C, and it can still grow normally.

2. Fast growth. Duck-billed fish is one of the fastest growing freshwater fish. The fry hatched in the same year can reach 1.5 kg each (specially raised) by the end of the year. It can reach more than 2 catties if raised in a set.

3. Save on feed. It mainly feeds on zooplankton, so there is no need to feed it separately in the cage. If it is raised exclusively, the feed ratio will not exceed 1.3:1.

4. Easy to catch. Its habits are similar to those of silver carp and it is not good at jumping. The catch rate of the first net is over 90%.

5. There are few diseases. They are mainly parasites. There are no diseases at present.

From the perspective of their eating habits, they will not pose a threat to each other if they are raised together; from the perspective of the breeding environment, the two have similarities (reservoirs, ponds, lakes); from the perspective of living habits, soft-shelled turtles like quiet environments, while platypuses are docile, so there will not be any major conflicts. Therefore, I personally think that they can be raised together.

2. What kind of fish is the one with the pointed mouth?

It's sturgeon.

Sturgeons are one of the earliest vertebrates in existence. Sturgeons belong to the class of bony fishes, the subclass of ray-finned fishes, the order of cartilaginous sclerotinia, and the order of Acipenser. Sturgeons are usually referred to as fish of the order Acipenser. It is one of the most primitive groups of fish.

The sturgeon has an elongated body, generally fusiform. The cross section of the trunk is nearly pentagonal. The snout is long, and the body is covered with 5 rows of bony plates, or sometimes naked. There is no orbital septum, preoperculum and interoperculum. The bony plates on the head may or may not be present. There is a row of spinous scales on the upper edge of the caudal fin. The fin rays are not ossified. The dorsal and anal fins are posterior. The pectoral fins are low. The pelvic fins are in front of the dorsal fin.

The caudal fin is crooked or whip-shaped, with the upper lobe longer than the lower lobe. The endocranium is cartilaginous and only partially ossified. The left and right palatoquadrate bones are not connected to the ethmoid or sphenoid regions, but are fixed to the jaw. There are clavicles, but no vertebrae. The swim bladder is large, and the dart tube is connected to the back of the esophagus. The esophagus is short. The stomach is enlarged and has a pyloric pouch. The intestine is short and has a well-developed spiral valve.

Additional information:

Sturgeon is the oldest fish on earth. After more than 200 million years of history, it still exists, bringing us the most primitive delicacy, the taste of the ocean. Sturgeon originated in the Cretaceous period hundreds of millions of years ago. It is known as the "panda in the water" and "living fossil in the water". It is an ancient biological population that still exists. Sturgeon has been loved by people since ancient times, and caviar made from sturgeon roe is the best in the world.

There are 30 species of sturgeons on the earth, 7 species distributed in North America, 12 species in Europe, 11 species in Asia, and 8 species in my country. Sturgeons are concentrated in the Northern Hemisphere. There are 8 species of sturgeons living in rivers and coastal areas in my country, 3 species distributed in Xinjiang, 2 species in Heilongjiang, 2 species in the Yangtze River, and 1 species in the rivers from the Yangtze River to the Pearl River and coastal areas.

Reference source: Baidu Encyclopedia - Sturgeon

What kind of fish is this? It has a long, pointed mouth. Have you ever seen it?

Acipenser sinensis

swordfish???????

Its body is elongated, with a black back, a white abdomen, and is covered with five rows of bone plates. It has the characteristics of fast growth, high feed conversion rate, strong disease resistance, high nutritional value, and no thorns in the muscles.

The Heilongjiang Fisheries Research Institute of the Chinese Academy of Fishery Sciences began to introduce it from Russia in 1998. After five years of breeding, it became a farmed variety among the introduced sturgeons.

3. Duck-billed fish can be bred in fresh water. Do you think this statement is correct?

Freshwater can breed duck-billed fish, but the water quality of the farmed duck-billed fish must be clear and pollution-free, which is suitable for the growth and reproduction of duck-billed fish. Duck-billed fish do not require high water temperature, as long as there is sufficient oxygen in the water, they can grow healthily. In addition, ponds should be checked frequently to ensure that there is sufficient feed and oxygen content, disease prevention should be done well, and abnormal conditions should be handled in a timely manner. Duck-billed fish is a freshwater fish.

As long as the water quality meets the requirements for growth, freshwater can be farmed. They have strong resistance and can withstand cold and heat. Whether the water temperature exceeds 35°C in summer or the water surface freezes in winter, as long as the pool water contains sufficient oxygen, the duckbill fish can grow and reproduce normally. Duckbill fish can be divided into single breeding and mixed breeding. Novices are recommended to raise them alone, which is not easy to cause problems. If it is in the form of mixed breeding, then you need to pay attention to the proportion of mixed breeding and control the number of breeding. Generally speaking, the ratio of silver carp and herbivorous fish we breed is 1:1:8. At the same time, the number of aquatic plants should be controlled to avoid eutrophication of the water body and lead to breeding failure. Ducks can be raised in ponds. Sturgeons, which feed on zooplankton, are highly adaptable, grow rapidly, have a gentle temperament, and have a short food chain.

It has a wide range of bait sources, is easy to raise and catch, and is suitable for breeding in reservoirs, lakes, and ponds. The epidermis, oral cavity, and abdominal lining of marine fish are all semipermeable membranes. Unlike freshwater fish, this membrane can better block seawater. In order to maintain the osmotic pressure balance inside and outside the body, marine fish will continuously swallow seawater, block the seawater in the mouth through the membrane, and then filter it through the gills, absorb desalinated water, and expel the salt in the mouth. But it is difficult for freshwater fish to do this.

The same is true for freshwater fish placed in seawater, because the concentration of seawater is higher than that of freshwater fish. The osmotic pressure will continuously push water out of the body, causing the freshwater fish cells to dehydrate and die. The eating habits of platypus are similar to those of silver carp (that is, bighead carp among the four major fish species, which varies from place to place, and some are called bighead carp). Platypus is a filter-feeding fish that mainly feeds on zooplankton and cladocerans. It especially likes water fleas and occasionally feeds on small aquatic insects such as chironomid larvae. White sturgeons with a body length of less than 12 cm can nibble on zooplankton, small fish, and shrimp one by one; fish with a length of more than 12 cm have well-developed feeding organs and can catch fast-swimming copepods. As white sturgeons grow, they also eat pelleted feed.

Freshwater can be used to breed duck-billed fish, but it is necessary to ensure that the water quality of the duck-billed fish is clear and pollution-free, and suitable for the growth and reproduction of duck-billed fish. Duck-billed fish do not have high requirements for water temperature. Whether it is hot or cold, as long as there is enough oxygen in the water, they can grow healthily. In addition, ponds should be inspected frequently to ensure that there is enough feed and oxygen, to prevent diseases, and to deal with abnormal situations in a timely manner.

That's right, because it is a freshwater species and can be raised freely in fields and fish ponds without any problems.

I think this statement is wrong. I think duck-billed fish cannot be bred in fresh water. Duck-billed fish are more suitable for living in salt water. Fresh water is not suitable for their living environment.