CATDOLL : CATDOLL: Artificial breeding of eels? Artificial breeding of shrikes?

1. Artificial breeding of eels?

Eel fry can be artificially bred. Eel is a very peculiar aquatic creature. It is born in seawater but grows in freshwater. Every year, female eels that are about to spawn in freshwater lakes will enter the sea along the river mouth or estuary to spawn. After spawning, its long migration journey ends, which also means the death of the female eel.

2. Artificial breeding of shrike?

Shrikes cannot be bred artificially

The shrike is a small carnivorous bird, also known as the shrike, and is ferocious by nature. It is an important insectivorous bird. Its main feature is a large and strong beak with a hook and notch at the tip of the upper beak, which is slightly similar to an eagle's beak. The shrike has short and round wings, usually with a convex tail; strong feet with hooks on the toes; it is ferocious and likes to eat small mammals, birds, lizards, various insects and other moving animals. Most of them live in open woodlands on hills, and their nests are cup-shaped and placed between thorny trees or bushes. The eggs often have slightly dark brown spots of varying sizes.

3. What is the significance of artificial breeding?

The main significance of artificial breeding

Artificially create conditions for fish reproduction, allowing fish to lay eggs, fertilize, and hatch. The hatching methods include natural hatching, water-sprinkling hatching, and debonding ring hatching. Therefore, in order to carry out artificial breeding, it is necessary to first understand in detail how fish reproduce in the natural environment and what breeding conditions are required.

4. Artificial breeding of tits?

Methods of artificial reproduction:

To artificially breed yellow siskins, you need to prepare a suitable environment and provide some nesting materials so that they can build their own nests. This bird usually builds its nest in a tree. Its nest is relatively hidden and is usually made of spider webs, moss, and fiber, which looks quite delicate. Both male and female birds will participate in nesting. After the nest is built, the female bird will start laying eggs. They usually breed in May and June, with 4-6 eggs in each nest. The parents will raise the chicks together, but the female bird is usually the main one.

5. Artificial propagation of Epiphyllum?

Epiphyllum is bred through hybridization to create new varieties, usually by sowing, but it takes 4 to 5 years from sowing to flowering.

When propagating by grafting, you need to select stem nodes that grow well, disinfect them, and cut them into tongue shapes before inserting them into the cactus.

Cutting propagation is carried out in May. Select strong and thick branches as cuttings. Roots will grow after about a month of insertion into the soil.

6. What animal doesn’t look like a fish but is a fish?

The lancelet is known as the least fish-like fish.

Amphioxus, also known as Bai's lancelet, slug fish, double-pointed fish or sea hair, is a precious marine animal. Due to its extremely special morphological structure, it has the characteristics of both invertebrates and vertebrates. It is a typical representative of the transitional type from invertebrates to vertebrates. Therefore, it is highly valued by the biological community at home and abroad.

The appearance of lancelet is very strange and interesting. It has a very small body, flattened on the left and right sides, pointed and thin ends, and a spindle-shaped body. It is generally only 4 to 5 cm long.

7. What type of fish is tilapia?

Tilapia - native to Africa, it is a tropical fish. The genus Tilapia includes more than 100 species, including subspecies. Tilapia has the characteristics of fast growth, high yield, omnivorous diet, few diseases and strong reproductive capacity.

8. What are the characteristics of fish?

The shape, body temperature, bones and skin of fish are different from those of other animals. In addition, fish have an organ that other animals do not have - the swim bladder. The existence of the swim bladder is also the reason why fish can float in the water.

1. Shape

Fish have a variety of shapes, sometimes quite different, but in general most fish are elongated and streamlined. Generally speaking, fish that swim fast in the water have elongated bodies, while fish that swim slowly or live at the bottom of the water are relatively flat. But some fish have very strange shapes, such as seahorses. The smallest fish is less than 1 cm, and the largest fish (whale shark) can reach 18 meters.

2. Body temperature.

Fish are cold-blooded animals. The body temperature of some tunas and sharks (especially sharks of the family Carcharhinidae) is higher than the temperature of the surrounding environment. Bluefin tuna is the only warm-blooded fish.

3. Bones

The skeleton of a fish is made of cartilage (cartilaginous fish) or bone (bony fish). There are four to seven gills on both sides of the skull, of which the front one has evolved into the zygomatic bone. The spine of a fish is connected to the skull, the ribs in the chest are connected to the spine, and there are long spines extending from the spine on the back, tail and abdomen.

4. Skin

Fish have two layers of skin: the outer layer contains glands that secrete mucus, and the inner layer contains many connective tissues, scales and pigment cells. The outer layer of mucus helps fish reduce drag when swimming. Cartilaginous fish do not have mucus, but the tiny, tooth-like protrusions on their skin have a similar function.

5. Fish bladder

The swim bladder is an inflatable sac-like organ in the fish's body. Its main function is not breathing. Fish rely on the swim bladder to adjust their specific gravity. Fish can use the swim bladder to slowly rise or descend without moving. Most bony fish have a swim bladder, an organ for regulating buoyancy.

9. Cold-resistant fish?

All fish species in northern China are cold-resistant, such as the common carp, crucian carp, silver carp, bighead carp, grass carp, black carp, sturgeon, black carp, loach, yarrow, schizothorax and so on.

10. Marine fish?

A: There are many kinds of marine fish. Common ones include shark, yellow croaker, horseface fish, eel, ox tongue fish, Spanish mackerel, snapper, silver pomfret, turbot, hairtail, etc. These fish contain a lot of vitamins, collagen and unsaturated fatty acids, which are good for the body. Not only can they supplement nutrition, but they can also improve skin quality, and they are low in fat and will not make you fat.