CATDOLL : CATDOLL: How are monosex yellowbone fish hatched?

1. How are monosex yellow bone fish hatched?

You need to first breed super male fish, that is, fish with YY chromosomes, and then mate them with ordinary female fish. The next generation will be ordinary male fish with XY chromosomes.

2. Does anyone know the living environment of the longspined fish? Can this fish reproduce in large numbers on its own?

Morphological characteristics

The Angci fish (also called Ang fish, Ga fish), the yellow catfish has a long body, a flat belly, a slightly flattened back half of the body, a large and flat head, a rounded and blunt snout, a large, lower mouth, and the upper jaw is slightly longer than the lower jaw.

[Yellow catfish]

Yellow catfish

Both upper and lower jaws have fine velvety teeth. Eyes are small, lateral, and the interorbital space is slightly raised. There are 4 pairs of whiskers, with the nose whiskers reaching the rear edge of the eyes, and the maxillary whiskers are the longest, extending behind the base of the pectoral fins. There are 2 pairs of maxillary whiskers, the outer pair is longer than the inner pair. The back of the body is dark brown, the sides of the body are yellow, and there are 3 intermittent black stripes. The abdomen is light yellow, and each fin is gray-black. There are 6 to 7 dorsal fin rays, 19 to 23 anal fin rays, 14 to 16 gill rakers on the outer side, and 36 to 38 vertebrae. The unbranched dorsal fin rays are hard spines with serrations on the rear edge. The distance from the starting point of the dorsal fin to the snout is shorter than to the base of the caudal fin. The pectoral fins have more developed hard spines, and both the front and rear edges are serrated. The front edge has 30 to 45 fine serrations, and the rear edge has 7 to 17 coarse serrations. The pectoral fins are slightly fan-shaped, with the end close to the pelvic fins. The adipose fin is shorter than the anal fin, with a free end and a starting point approximately opposite to the anal fin.

Living habits

Pelteobagrus fulvidraco lives in still water or slow-flowing rivers and is a bottom-dwelling fish. It lives on the bottom of lakes during the day and swims to the surface to look for food at night. It has a strong ability to adapt to the environment, so it can survive in adverse environmental conditions. Juvenile fish mostly look for food along the banks of rivers and lakes.

This fish is a warm-water fish. The survival temperature is 0~38℃. The best growth temperature is 25~28℃, the pH range is 6.0~9.0, and the optimum pH is 7.0~8.4. The ability to tolerate low oxygen is average. It grows normally when the dissolved oxygen in the water is above 3mg/L, floats when it is below 2mg/L, and suffocates and dies when it is below 1mg/L.

feeding habits

The diet of yellow catfish is mainly carnivorous and omnivorous. Foraging activities are generally carried out at night. The food includes small fish, shrimp, various terrestrial and aquatic insects (especially chironomid larvae), small mollusks and other aquatic invertebrates, and sometimes small fish. Its diet varies with the environment and seasons. In spring and summer, it often swallows the eggs of other fish. In the cold season, there are more small fish in the food, and the benthic animals gradually decrease. The diet of yellow catfish of different sizes is also different. The body length of 2~4cm mainly feeds on copepods and cladocerans; the individuals with a body length of 5~8cm mainly feed on zooplankton and aquatic insects; the individuals over 8cm feed on mollusks and small fish.

Age and growth

The growth rate of yellow catfish is relatively slow, and the common individual weight is 200~300g. In natural large waters, a 1-year-old fish can grow to a body length of 56mm and a weight of 5.7g. A 2-year-old fish can grow to a body length of 98.3mm and a weight of 20.6g. A 3-year-old fish can grow to 135.5mm and a weight of 36.1g. A 4-year-old fish can grow to 160.1mm and a weight of 58.2g. A 5-year-old fish can grow to 177.7mm and a weight of 81.3g. Male yellow catfish are generally larger than female fish. Fish aged 1 to 2 grow faster, and then grow slowly, with a 5-year-old fish only 250mm.

Reproduction

Yellow catfish reaches sexual maturity at 2-4 winters (about 3 years old or more), and the smallest mature individual is 11.7cm for females and 14.8cm for males. The sexually mature male fish has a reproductive process behind the anus, while the female fish does not. It lays eggs in April and May in the south, and starts to lay eggs in June in the north. It is one of the fish species that lay eggs later. The water temperature is required to be between 20 and 30 degrees Celsius. The spawning activity takes place at night, and when the weather changes from sunny to rainy, it can lay eggs. Yellow catfish has the habit of building nests and laying eggs to protect their offspring. When laying eggs, the parents choose sandy and muddy shallows with water plants, with a water depth of 8-10cm, and use the pectoral fins to shake intermittently on the mud bottom. There are several people building fish nests together, and there are also dozens of groups, forming a group of holes not far apart. Each hole is about 15cm in diameter and 10cm deep. The eggs are laid and fertilized in the hole. The male fish protects the eggs at the hole mouth for hatching. When other fish approach the hole, the male fish pounces on the intruder and drives it away. It often uses its huge pectoral fins to stir the water in the hole, using the water flow to help the eggs hatch. It guards until the fry can swim on their own (7-8 days). During this period, the male fish hardly eats. After the female fish lays eggs, it leaves the nest to look for food. The yellow catfish carries 1086-4469 eggs, and the mature eggs are 1.7mm in diameter. The fertilized eggs are yellow and sticky, and they sink to the bottom of the nest or adhere to the roots of water plants on the wall of the nest. The eggs produced are about 2.5mm in diameter and can hatch within two days. The yellow catfish may be a fish that lays eggs in batches.

3. Can artificial fish breeding naturally reproduce fry after a few years?

It depends on the fish species. Crucian carp, carp, black carp and yellow catfish can reproduce in still water, but silver carp, bighead carp, black carp and grass carp need flowing water to stimulate spawning and will not reproduce naturally in ponds. In addition, the former can reproduce in one or two years, while the latter need at least four or five years to reach sexual maturity.

4. La Dingzi?

Yellow catfish, scientific name: Pelteobagrus fulvidraco, is a species of fish in the family Catfish and genus Pelteobagrus.

The body is about 20cm long, with a straight ventral surface, laterally flattened posterior half of the body, and a slender caudal peduncle.

The head is large and flat, the snout is short and blunt, the upper and lower jaws are roughly equal in length, the mouth is large and low-set, and there are velvety tooth bands on both cheeks and palate bones. The eyes are small and sideways.

There are 4 pairs of whiskers, the end of the nose whiskers can extend behind the eyes, 1 pair of maxillary whiskers, the longest, and 2 pairs of chin whiskers, which are shorter than the maxillary whiskers. The body is naked and scaleless, and the lateral line is complete. It is omnivorous, and its main food is small benthic animals, shrimps, small aquatic insects and some invertebrates.

Spawning occurs in April and May, and the parents have the habit of digging pits to build nests and protect their offspring.

During the reproductive period, the male fish has the habit of building nests. It lives in shallow water or slow-flowing shallows, hiding during the day and coming out at night. It is widely distributed in the Pacific waters in eastern China.

The growth rate of yellow catfish is relatively slow, with individual fish weighing 200-300g.

In large natural waters, a one-year-old fish can grow to 56mm in length and weigh 5.7g, while a two-year-old fish can grow to 98.3mm in length and weigh 20.6g.

A 3-year-old fish can grow to 135.5mm and weigh 36.1g.

A 4-year-old fish can grow to 160.1 mm and weigh 58.2 g. A 5-year-old fish can grow to 177.7 mm and weigh 81.3 g.

Male yellow catfish are generally larger than females. Fish grow faster when they are 1 to 2 years old, and then grow slowly. Fish at the age of 5 are only 250mm.

Some species grow very slowly and attack other domestic fish.