Artificial Goldfish Breeding Technique

Preparing the spawning tank

You can use a cement tank, a plastic tank or a tank lined with tarpaulin for fish to spawn.  

The spawning tank must be easily filled and drained so that the water can be changed regularly. 

Water source must be clean, low silt, enough oxygen for fish to breathe, pH fluctuates from 7 to 8, water temperature 20 - 28°C. 

The area and depth of the tank for spawning depends on the water change conditions.

Prepare media for spawning fish

Water hyacinth hyacinth.

Commonly used today. 

Choose moderate plants (stems and roots are not too large).

Before spawning, duckweed is washed, removed the rotten part and dipped in 3% brine (30 g salt mixed in 1 liter of water) or 0.3 mg/l malachite green solution (usually choose duckweed with long roots). 10 - 20 cm). 

The number of duckweed depends on the number of fish for spawning. Usually 1kg female fish need 100 duckweed. 

Nylon rope: tear and tie into small bundles. 

Mesh: cut into small square pieces

Also read: Genome Editing: Potential to Improve Aquaculture Breeding, Production

Select brood fish for spawning

- Fish from 8 months old and up.

- Healthy.

- No damage, deformities.

- Bright, characteristic colors.

- Have different origins.

Distinguish between male and female:

Male fish: thanks to the slight rough pectoral fins vây 

Female: pectoral fins are not rough, belly is big and soft

For reproduction 

Natural spawning fish. 

The fish should be spawned in the afternoon. 

Put the brood fish into the spawning tank with a male-female ratio of 1: 1. 

Conduct water stimulation for fish by artificial rain, combined with aeration to increase oxygen where the medium is placed. 

The fish will spawn early the next morning. If the fish does not spawn, continue to stimulate the water to wait overnight.  

After spawning, proceed to collect the medium to incubate in another place, and at the same time drain the water to catch the broodstock fish back to the pond for further farming.

Also read: A New Means to Measure Broodstock

Stimulating artificial reproduction 

Stimulant injections

Hormones: Brain lobes, Ovaprin. 

- Amount: 

Female: 1.6-2 mg brain lobe + 0.3 ml ovaprin/1kg female. 

Male fish: 1/3 dose of female fish Injection site: base of abdomen. 

- After injection, arrange in the spawning tank for the fish to spawn naturally 

- Ratio of male to female: 1-1 

- After spawning, proceed to collect the media to incubate in another place, and at the same time drain the water to catch the brood fish and return it to the pond for further farming. 

- After laying 48-72 hours, the eggs will hatch into fry 

- The fry after 3 days of age will consume all the yolk, so feed the fish with food 1 day before.

Fry tank 

- pool area 1-4 m 2 , the water level 40-60 cm. 

- Stocking density of 500 fish/m 2 . 

Food and feeding method:

- The first 10 days after hatching feed moina. 

- 20 days after feeding, eat only chopped worms. 

- 30 days of worm feeding. 

- Feed twice a day in the morning at 7-8 am, in the afternoon at 4-5 pm

Source: Tepbac.com