CATDOLL : CATDOLL: Can yellow croaker be exported?

Can yellow croaker be exported?

Yellow catfish (Petroselitmus fulvidraco) can be exported.

Yellow catfish mostly inhabits shallow waters around lakes with slow currents and abundant aquatic plants, and rivers entering the lakes. It lives a bottom-dwelling life, especially in shallows with still water or slow currents, and in places with abundant humus and mud. It is omnivorous, and mainly feeds on animal feed under natural conditions. In the fry stage, it feeds on zooplankton, and in adult fish, it feeds on insects and their larvae, small fish and shrimp, snails and clams, and also eats plant debris.

Distributed in Laos, Vietnam, China, North Korea, and southeastern Siberia, Russia. In China, it is distributed in the Pearl River, Min River, Xiang River, Yangtze River, Yellow River, Haihe River, Songhua River, and Heilongjiang River systems.

In the first half of 2021, Yangzhou added three more geographical indication trademarks of the People's Republic of China, namely "Anfeng Buye", "Baoying Yellow Catfish" and "Baoying Mandarin Fish".

Reproduction method:

Yellow catfish is a type of fish that lays eggs once a year and has the habit of breeding in groups under natural conditions. The breeding season is from mid-May to mid-July, and the water temperature varies from 25 to 30.5℃. Yellow catfish generally reaches sexual maturity at the age of 2, and the Yellow catfish in Chenghu Lake also reaches sexual maturity at the age of 1 winter. Among the specimens measured, the smallest mature individual is 11.5 cm long for females and 13.5 cm long for males. Females reach sexual maturity earlier than males.

The absolute egg-carrying capacity of yellow catfish is 2,500 to 16,500 eggs, with an average of 4,000 eggs, and the relative egg-carrying capacity is 58.33 to 77.77 eggs/gram, with an average of 65.71 eggs/gram. The main breeding areas of yellow catfish are shallow water, hard bottom, certain beach foot, high transparency, slow water flow, rich bait resources, and suitable waters for nesting and hatching.

What season is suitable for breeding Hetanghua yellow bone fish?

The breeding of Hetang yellow catfish begins at the end of the year. Parent fish are collected from ponds or lakes. Female fish are required to be more than 50 grams and male fish are required to be more than 100 grams. They are placed in ponds for special pond breeding. Only a small number of silver carp are raised to control water quality. Various kinds of frozen wild fish, shrimp, snails, clams and other animal meat paste are mixed with feed factory premixes to make a mixed feed containing about 40% animal protein. Feed 1-2 times a day, each time accounting for 3%-5% of the fish body. After entering April, strengthen the pre-spawning regular water flow stimulation and other strengthening breeding measures, so that the spawning period of yellow catfish is advanced to the first and middle ten days of May, thus effectively avoiding the high temperature period in June and July, and increasing the breeding cycle of yellow catfish seedlings.

Growth cycle and temperature requirements of yellow croaker farming

Breeding cycle

Usually the entire breeding period is about 12 to 13 months. The environmental temperature will affect the breeding time. For example, it may be 12 months in warm areas and about 13 months in colder areas. Different breeding species have different times. For example, all-male yellow catfish can complete its growth period in about 10 to 11 months. The feed directly affects the growth rate of yellow catfish. Feeds with high protein grow faster, while feeds with low protein grow relatively slower.

Generally, they will eat less at temperatures below 11 degrees. The most suitable temperature for eating is between 25 and 28 degrees, but they can eat normally at 15 to 20 degrees. If they encounter high temperatures above 30 degrees, they will eat less and be affected to a certain extent, but they can usually survive in water temperatures around zero to 38 degrees without life-threatening. But it is best to maintain normal temperature, or normal water temperature, because the temperature outside is usually different from that in the water.

What factors affect the reproduction of yellow bone fish?

Spawning time

Under natural conditions, yellow croakers generally start spawning in late May and continue until late July, as evidenced by anatomical observations of their gonadal development stages and the earliest batch of natural seedlings captured in the lake (generally in mid-July). If artificial intensive breeding is carried out before spawning, the spawning time can generally be advanced by 10-15 days.

Because yellow bone fish breeds and lays eggs many times a year, in order to effectively increase the spawning rate, we artificially inject oxytocin twice, and adjust the needle distance according to the water temperature, generally 8-12 hours, so that the eggs developed in batches mature quickly and are laid at the same time. At the same time, in order to avoid the loss of liquid medicine, the two injection sites should be strictly separated, preferably at the base of the dorsal fin and the chest cavity.

The technology of breeding yellow bone fish

Selecting a Pond

Generally, when choosing a broodstock breeding pond, you need to try to choose a pond with convenient filling and drainage, convenient transportation, a flat bottom, hard bottom, and water conservation. It should be located near the spawning pond and in a quiet environment. The area of ​​the broodstock breeding pond should be 2-15 acres. The specific size can be determined according to the scale of seedling production. The water depth of the breeding pond should be maintained at about 2.2m.

Since the individuals of yellow croaker broodstock are relatively small, the area of ​​the breeding pond should not be too large. If the area of ​​the breeding pond is too large, it will lead to untimely induction of spawning and cause miscarriage of the yellow croaker broodstock. The breeding pond needs to be cleaned once to remove wild fish in the pond, kill harmful organisms and pathogens, and improve the water quality of the pond.

If it is an old pond, you need to remove the silt at the bottom of the pond. It is usually used as a breeding pond for yellow croaker broodstock. Regardless of whether it is a newly excavated pond or an old pond, the pond must be disinfected before the broodstock are put into the pond.

Hetanghua yellow bone fish can be cultivated all year round

The breeding period of Hetanghua yellow bone fish is about 12 to 13 months. The ambient temperature will affect the breeding time.

For example, in warm areas it may be 12 months, and in colder places it may be around 13 months.

You can buy soil for earthworms from large farms nearby. You can use pig manure, cow manure and other animal manure to ferment and then use it to raise earthworms! You can catch yellow croaker, grass carp, carp, silver carp, bighead carp and so on in the waters!